What glazing safety requirements apply to glass extensions?

Part K (Protection from falling, collision and impact) requires safety glazing in critical locations: all glazing below 800mm from floor level, glazing in doors and within 300mm of doors up to 1500mm height, and low-level panels. Safety glass must be toughened (to BS EN 12150) or laminated (to BS EN ISO 12543), and permanently marked with the safety standard.

What happens if I remove the doors between my conservatory and house?

Removing the thermal separation means the conservatory exemption no longer applies. The conservatory becomes part of your home's heated envelope and must comply with current Building Regulations—particularly Part L thermal requirements. This typically means upgrading to high-performance glazing, improving roof insulation, and potentially upgrading the heating system. Retrospective compliance can be costly.

Do I need a completion certificate for my conservatory?

For exempt conservatories, no Building Regulations completion certificate is required. However, you should obtain certificates for Part P electrical work. For non-exempt extensions, you must receive a completion certificate from Building Control or an Approved Inspector—this is essential when selling your property as solicitors check for these documents.

What's the difference between Building Control and an Approved Inspector?

Both can oversee Building Regulations compliance. Building Control is your local authority's service. Approved Inspectors are private companies licensed to perform the same function. Both issue completion certificates with equal legal standing. Approved Inspectors often offer more flexibility and faster response times, but local authority Building Control has intimate knowledge of local conditions.

Do conservatories need Building Regulations approval?

Conservatories are often exempt from Building Regulations if: floor area is under 30m², they're built at ground level, separated from the house by external walls/doors/windows, have independent heating controls, glazing complies with safety requirements, and electrical work is certified. If you remove the separating doors, the exemption no longer applies and Building Regulations compliance is required.

Do I need planning permission for a conservatory in a Conservation Area?

In Conservation Areas, you may still build a conservatory under Permitted Development, but with additional restrictions: no cladding, and no side extensions. Rear conservatories are generally permitted if they meet standard size limits. However, some Conservation Areas have Article 4 Directions removing PD rights entirely, so always check with your local planning authority first.

How close to my boundary can I build a conservatory?

Under Permitted Development, if your conservatory is within 2 metres of any boundary, the maximum eaves height is 3m. There's no minimum distance requirement—you can build right up to the boundary. However, you may need a Party Wall Agreement if building on or near a shared boundary, and neighbourly consideration is always advisable.

What's the difference between a conservatory and an extension for planning purposes?

For Building Regulations exemption, a conservatory must have: at least 50% glazed walls, at least 75% glazed roof, and thermal separation from the house (doors/windows between). For planning permission purposes, conservatories and extensions are treated similarly under Permitted Development rules—the same size limits apply. The distinction matters more for Building Regulations.

What happens if I build a garden room without planning permission?

If you build without required planning permission, the local authority can issue an enforcement notice requiring you to demolish the structure or apply for retrospective permission. This can be expensive and stressful. When selling your property, lack of proper permissions will be revealed in searches and can delay or prevent sales. Always verify your garden room meets Permitted Development criteria or obtain planning permission before building.

roomoutsideuk

01st June, 2026

Aluminium vs Timber vs uPVC: Choosing the Right Frame in 2026

Conservatory frame guide

Aluminium vs Timber vs uPVC: Choosing the Right Frame in 2026

A practical East Sussex guide to frame materials, covering style, maintenance, coastal exposure, heritage settings and long-term performance.

Updated 1 June 2026 12 minute read East Sussex conservatories

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The short answer

For most East Sussex conservatory projects in 2026, aluminium is the strongest all-round frame choice.

It gives you slimmer sightlines than typical uPVC, lower maintenance than timber and the structural strength needed for bright glazed rooms. Timber still wins in some heritage settings, and uPVC still has a place where budget is the main driver.

Design note: this page follows the Room Outside blog guide layout with scoped article styling, card sections, jump navigation and FAQ accordions.

Modern aluminium conservatory with slim dark frames and glazed roof attached to an East Sussex home — Aluminium frames suit bright, glazed conservatory designs where slim sightlines and long-term durability matter.

Aluminium, timber and uPVC at a glance

The practical differences before you choose a conservatory frame

Every frame material can work. The real question is what your project values most: low maintenance, heritage character, lowest initial price or a clean modern finish with more glass and less frame.

Material	Best for	Main advantage	Watch point	2026 verdict
Aluminium	Premium modern conservatories, larger glazing and coastal homes	Slim frames, strong structure and low maintenance	Higher initial cost than basic uPVC	Best all-round
Timber	Period homes, listed buildings and conservation-sensitive projects	Natural warmth and authentic traditional detailing	Needs painting, staining and regular care	Best heritage look
uPVC	Budget-led conservatories and simple white-frame projects	Lower upfront cost and easy daily maintenance	Bulkier profiles and a less premium finish	Best entry cost

Why aluminium leads in 2026

Slim sightlines, strong frames and a premium contemporary finish

Aluminium is ideal if you want a bright, open conservatory with more glass and less frame. Because aluminium is structurally strong, the profiles can be slimmer than many uPVC alternatives, helping maximise natural light and garden views.

Modern aluminium systems are thermally broken, so the inner and outer parts of the frame are separated to reduce heat transfer. That matters when the conservatory is being designed as a year-round living space rather than a fair-weather garden room.

Slimmer frame lines

Aluminium can carry larger glazed areas without the bulky profiles often associated with budget uPVC frames.

High visual impact

Low maintenance

Powder-coated aluminium needs routine cleaning, not repainting, sanding or staining.

Low upkeep

Coastal suitability

For East Sussex sea-air locations, ask for suitable coating, hardware and cleaning guidance.

Location dependent

Best fit

Aluminium suits modern conservatories, garden rooms, larger glazed openings, bifold-door designs and homes where the frame should feel crisp rather than chunky.

When timber still makes sense

Warmth, character and period authenticity

Timber remains a beautiful choice, especially for listed buildings, older cottages and homes in conservation areas. It has a natural warmth that aluminium and uPVC cannot fully replicate.

The trade-off is maintenance. Timber usually needs more regular care, including painting or staining, and it can cost more upfront. In some heritage settings, though, the character of the building matters as much as performance.

Use timber when appearance rules the brief

If the property is listed, visually sensitive or part of a conservation area, timber may be the most appropriate material. Check local planning guidance before settling on any replacement-style frame.

A frame is only part of the comfort equation

The frame material matters, but so do the glass, roof specification, ventilation, orientation and whether the conservatory remains thermally separated from the main house. A well-specified aluminium frame can form the backbone of a room that feels light, calm and usable across the seasons.

Explore New Generation Glass See conservatories

East Sussex checks before you decide

Coast, conservation and year-round use all change the answer

Local context matters. Coastal exposure, conservation areas and the age of the property can all affect what frame material makes most sense.

Aluminium fits

Go with aluminium if…

You want slim sightlines and a premium modern look

Your design includes large panes, bifolds or strong garden views

You want low maintenance near coastal air

The conservatory should feel like a long-term home improvement

Check first

Consider another route if…

The property is listed or very conservation-sensitive

Budget only stretches to the lowest-cost frame option

You want a deliberately rustic or traditional painted-wood character

The existing house design strongly favours another material

Planning and building regulations note

In England, conservatories are often treated differently depending on whether they remain thermally separated from the main house. If the space is opened up to the home or connected to the main heating system, it may need to meet more demanding building regulation requirements.

The 2026 verdict

Choose aluminium if you want a conservatory that feels bright, modern, durable and easy to maintain. Choose timber where heritage character or planning sensitivity is the priority. Choose uPVC where budget is the main driver.

For most East Sussex homeowners looking for a long-lasting conservatory with slim frames and strong year-round performance, aluminium offers the best balance of style, strength and practicality.

The honest rule of thumb

If the room is meant to be a genuine everyday living space, invest in the frame and glazing specification. If the project is mainly a seasonal garden room, a simpler specification may be enough. A site visit normally settles the right route quickly.

Room Outside

Conservatory, Orangery and Glass Extension Specialists – Established 1973

Room Outside has designed and built orangeries, conservatories and glass extensions across East Sussex, West Sussex, Hampshire, Surrey, Kent, Essex, Greater London, Dorset and Berkshire for over 50 years. Call us anytime – David, our digital assistant, will take a few details so the right specialist can follow up personally. 01243 538999

Explore Room Outside guides

Cost, lifespan and maintenance in 2026

The best frame is the one that still makes sense ten years from now

Frame choice is often discussed as a simple price comparison, but the real cost of a conservatory is spread across the whole life of the room. The initial quote matters, but so do maintenance, thermal performance, finish durability, replacement cycles and whether the design still looks right as the house changes around it.

Aluminium normally sits above basic uPVC on initial cost, but it often earns its place on premium projects because it gives a sharper finish, stronger frames and lower long-term upkeep. Timber can be premium too, especially when made well, but it asks more from the homeowner over time. uPVC is the sensible budget route when the brief is simple and the design does not need very slim profiles.

Material	Initial cost	Maintenance level	Typical lifespan position	Best value when
Aluminium	Mid to high	Low: clean frames and inspect drainage, seals and hardware	Strong long-term option when specified correctly	You want a premium, durable, low-maintenance conservatory
Timber	Mid to high	Medium to high: repainting or staining will be needed	Long-lasting if cared for well	Heritage character is more important than low upkeep
uPVC	Low to mid	Low day-to-day, but finish and profile style may date sooner	Good for straightforward projects, weaker for premium builds	Budget is fixed and the design is simple

Do not judge by frame price alone

A cheaper frame can become poor value if it limits glazing size, looks bulky, needs replacing sooner or makes the finished room feel less connected to the garden. A better frame specification is often easier to justify when the conservatory is intended as an everyday living space.

Which frame looks right on different homes?

The architecture of the house should lead the material choice

A conservatory should not feel like an afterthought. The frame material, colour and profile need to sit comfortably with the existing house, the garden and the level of finish you want inside the new space.

Modern coastal homes

Aluminium is usually the cleanest fit. Dark grey, black, bronze or soft neutral powder-coated frames can give a crisp architectural look without making the conservatory feel heavy.

Aluminium usually wins

Period and heritage properties

Timber may be the natural choice when the building has original painted joinery, traditional proportions or planning sensitivity. Aluminium can still work, but the colour, sightlines and detailing need careful handling.

Timber often fits best

Simple family homes

uPVC can be completely sensible on modest homes where the conservatory is compact, practical and budget-led. Aluminium is worth considering if the design includes larger doors, a premium finish or more glass.

Brief dependent

Colour is just as important as material. White uPVC can look familiar and clean, but it may also emphasise bulk. Dark aluminium can make the frame recede, which is useful when the main goal is garden view. Timber gives warmth, but painted finishes need ongoing care if they are exposed to sun, rain and coastal air.

Specification details to confirm before you commit

Small technical decisions make a big difference to comfort

Two aluminium conservatories can perform very differently depending on the system, glass, roof, ventilation and installation. The same is true for timber and uPVC. Before choosing a frame material, make sure the full specification has been discussed clearly.

Ask about thermal breaks and glazing

For aluminium, the thermal break helps reduce heat transfer through the frame. The glass specification then does much of the heavy lifting for comfort, glare control and year-round usability.

Comfort check

Confirm coating and hardware for coastal exposure

East Sussex homes near the coast should discuss powder coating, fixings, handles, hinges and cleaning guidance. Salt air is not a reason to avoid aluminium, but it is a reason to specify it properly.

Coastal check

Check ventilation and solar control

A bright glazed room needs a plan for summer heat, winter comfort and everyday ventilation. Roof vents, opening windows, door configuration and glass choice should all be part of the same conversation.

Usability check

Clarify planning and building regulation assumptions

Do not assume every conservatory is treated the same. Whether the room is thermally separated, how it connects to the main house and whether the property is in a sensitive area can all affect the route.

Compliance check

How to choose the right frame

If you are still split between aluminium, timber and uPVC, start with the role the conservatory needs to play. A room that will be used every day deserves a different level of specification from a simple seasonal space. A property with heritage character needs a different design conversation from a modern coastal home.

For a premium East Sussex conservatory, aluminium is normally the strongest starting point. It gives a contemporary finish, handles larger glazed areas well and keeps maintenance manageable. Timber should stay on the table when the house has traditional detailing or planning sensitivity. uPVC remains useful when the project is straightforward and cost control matters most.

The practical decision route

Choose aluminium for slim frames, modern design, larger glass and low maintenance. Choose timber for heritage authenticity and natural character. Choose uPVC for a simpler, lower-cost conservatory where premium sightlines are less important.

Questions to ask before approving your frame choice

Design questions

Check the look and layout

Will the frame colour suit the existing windows, doors and roofline?

Are the sightlines slim enough for the garden view you want?

Does the material match the age and character of the property?

Performance questions

Check comfort and upkeep

What cleaning or repainting will the frame need over time?

What glass, roof and ventilation specification is included?

Is the frame system suitable for your location and exposure?

Sources and further reading

Based on UK Building Regulations Part L, permitted development guidance via the Planning Portal, FENSA conservatory advice, QUALICOAT seaside guidance and local conservation window guidance. For independent guidance, see the Planning Portal conservatory guide, GOV.UK Approved Document L, FENSA and QUALICOAT Seaside. Planning rules are applied locally and change over time, so always confirm with your local authority. Last updated June 2026.

Frequently Asked Questions

The conservatory frame questions East Sussex homeowners ask most often.

Is aluminium better than uPVC for a conservatory?

Aluminium is usually better for a premium finish, slimmer frames, larger glass areas and long-term durability. uPVC remains useful for simpler projects where upfront cost is the main priority.

Is timber worth the extra maintenance?

It can be, especially for period homes, listed properties and conservation areas. For most modern homes, aluminium gives a cleaner balance of appearance, performance and upkeep.

Can aluminium suit a traditional East Sussex home?

Yes, particularly when the frame colour and profile are chosen carefully. For highly sensitive buildings, it is worth checking local planning guidance before deciding.

What should coastal homeowners ask for?

Ask about powder coating, coastal exposure guidance, cleaning intervals and hardware specification. The right finish and maintenance routine can make a noticeable difference near sea air.

Call us anytime – David, our digital assistant, will take a few details so the right specialist can follow up personally. 01243 538999

Design a Conservatory Frame That Suits Your Home

Frame material affects light, comfort, upkeep and the look of the finished room. We can help you choose the right specification for your East Sussex home before you commit.

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Resources

Advice & Inspiration

Modern glass conservatory with dark aluminium frames attached to a brick home, opening onto a landscaped garden patio.

Conservatories

Conservatory Refurbishment Costs: What You Get in 2026

Modern open-plan kitchen and dining extension with a large glazed lantern roof bringing natural light into the space

Conservatories

Lantern Roofs Explained: When They Work, When They Don’t & What They Cost

Split image of a cold conservatory and a warm insulated conservatory showing the difference between heat loss and year-round comfort

Conservatories

The Cold Conservatory Problem: Causes & Permanent Fixes

roomoutsideuk

28th May, 2026

Conservatory vs Orangery vs Glass Box: Buyer’s Framework

Conservatory vs Orangery vs Glass Box: A Buyer’s Framework

A practical side‑by‑side comparison of cost, planning, thermal performance and decision factors – helping homeowners across Hampshire, Surrey, Sussex, Kent and London choose the right glazed extension.

Book a Consultation Request Brochure

The short answer: Conservatories maximise light and are generally most affordable; orangeries offer better thermal stability and feel more like a permanent house extension; glass box extensions deliver a contemporary, frameless aesthetic with premium cost and engineering. The right choice depends on your budget, site conditions, planning context and how you intend to use the space.

Last updated: May 2026 – based on UK industry data from Which?, Homebuilding & Renovating, Everest, Ultraframe and Room Outside pricing guides.

£48k–£60kConservatory (20m²)

£60k–£115k+Orangery (20m²)

£50k–£180k+Glass box extension

2–20 weeksBuild time range

Quick comparison at a glance

Conservatory

Primary structurePredominantly glazed walls and roof

Glazing proportion>50% wall glazed, >75% roof translucent

Thermal performanceModern glazing (U‑value 1.4 or lower) improves comfort

Planning permissionOften Permitted Development

Building RegulationsExempt if <30m² and thermally separated

Build time2–4 weeks

Cost per m² (2026)£1,300–£3,600

Orangery

Primary structureBrick/masonry base with glazed upper and roof lantern

Glazing proportion<50% wall glazed, roof lantern only

Thermal performanceSolid walls add mass, better thermal stability

Planning permissionUsually PD but may need approval for larger designs

Building RegulationsUsually full approval required

Build time6–12 weeks

Cost per m² (2026)£2,400–£3,600

Glass Box Extension

Primary structureFrameless or slim‑frame structural glass

Glazing proportionNearly 100% glazed, minimal framing

Thermal performanceDepends on glass spec; high‑end systems approach wall U‑values

Planning permissionAlmost always required

Building RegulationsAlways full approval

Build time10–20 weeks

Cost per m² (2026)£2,000–£4,500

1. Understanding the three options

Conservatory

A conservatory is defined under UK planning law as a structure with at least 50% of its side wall area glazed and at least 75% of its roof area covered by translucent material (glass or polycarbonate). Traditional styles include Victorian, Edwardian and lean‑to. Modern conservatories use low‑E glass, argon fill and warm‑edge spacers, making them comfortable for much of the year. Build time is typically 2–4 weeks and they are often the most budget‑friendly option.

Orangery

Historically built to protect citrus trees, an orangery sits between a conservatory and a traditional extension. It features a solid brick or masonry base, large windows above, and a flat solid roof with a central glass lantern. Less than 50% of the wall area is glazed, which means better thermal insulation and a more permanent feel. Build time: 6–12 weeks. Estate agents often perceive orangeries as adding more property value than a standard conservatory.

Glass Box Extension (Frameless/Structural Glass)

A glass box uses structural glass or slim‑frame aluminium systems (as narrow as 35–50mm) to create almost invisible boundaries between indoors and outdoors. True frameless systems rely on glass fins and structural silicone. These extensions require full Building Regulations approval, longer build times (10–20 weeks) and higher budgets, but deliver a striking contemporary aesthetic.

2. Cost breakdown (2026 UK data)

Cost figures are compiled from Hallmark Glazed Extensions, Room Outside, Everest, Ultraframe, MyJobQuote and independent surveys. Actual costs vary with site conditions, specification and location (London and South East carry a 20–30% premium).

Option	Typical cost range (20m², 2026)	Notes
Conservatory (uPVC, glass roof)	From £48,000	Basic specification, may have higher U‑value.
Conservatory (aluminium frames)	From £60,000	Slimmer sightlines, better thermal breaks.
Orangery (standard)	£60,000–£85,000	Brick base, standard roof lantern.
Orangery (premium)	£85,000–£115,000+	New Generation Glass, improved insulation.
Framed glass extension	£50,000–£100,000	Slim aluminium frames (35–50mm).
Structural glass box	£80,000–£180,000+	Glass fins, bespoke engineering.

Key cost drivers: foundations (clay soil or trees add £4k–£15k+), frame material (timber most expensive, uPVC most affordable), glazing specification (solar control adds 10–25%), and kitchen fit‑out (£15k–£45k extra).

3. Planning permission & Building Regulations

Permitted Development (PD): Conservatories and orangeries can often be built under PD if they do not exceed 4m height, 3m depth (semi/detached) or 4m (detached), and cover no more than 50% of the garden. Glass boxes are almost never exempt because they are not considered “conservatories” in the legal definition – they always require planning permission.

Building Regulations: A conservatory is exempt if all five conditions are met: under 30m², ground level, thermally separated, independent heating, and glazing safety. Orangeries and glass boxes generally require full approval, meeting current U‑value standards (walls ≤0.28 W/m²K, roof ≤0.16 W/m²K).

4. Thermal performance & year‑round comfort

Modern conservatories with solar‑control glass (g‑value ≤0.35) and thermally broken frames can be comfortable for much of the year, but they still have lower thermal mass than brick walls. Orangeries benefit from solid perimeter walls, which moderate temperature swings and often feel more stable. Glass box extensions rely entirely on glass specification – high‑performance units with low‑U and low‑g values can perform well, but occupants should expect quicker temperature changes than in an orangery.

5. Property value contribution

According to 2026 estate agent surveys (Homebuilding & Renovating, Which?): a quality conservatory typically adds 5–7% to a home’s value; an orangery can add 10–15% because it is perceived as a permanent extension. Glass box extensions, being less common, have less published data but can be a strong selling point for high‑end contemporary properties.

6. A buyer’s decision framework

Choose a conservatory if…

Maximum natural light is the top priority
Budget is moderate (£48k–£60k)
You want a quick build (2–4 weeks)
Use: dining, playroom, garden room, occasional office

Choose an orangery if…

You want a permanent, solid feel
Better thermal performance and sound insulation matter
Budget: £60k–£115k+
Use: kitchen, family room, home office, reception

Choose a glass box if…

Contemporary, frameless aesthetic is essential
Prepared for planning permission and longer build (10–20 weeks)
Budget: £80k–£180k+
Use: high‑end kitchen, living area, architectural home office

Explore Room Outside’s products & guides

External sources and further reading

Frequently asked questions

Which is cheaper: conservatory, orangery or glass box?

A conservatory is generally the most affordable option, with entry-level prices from around £48,000 for a 20m² build. Orangeries typically cost from £60,000 upward, and structural glass boxes often start above £80,000.

Do I need planning permission for an orangery?

Many orangeries fall under Permitted Development, provided they meet size and height limits. However, because orangeries have a solid roof and substantial brickwork, some local authorities treat them as extensions – always check with your planning department or specialist supplier.

Can I use a conservatory all year round?

Yes – modern conservatories with solar‑control glass, low‑E coatings, and thermally broken frames can be comfortable throughout the year. However, they have lower thermal mass than an orangery or brick extension, so temperature swings may be more noticeable.

Which adds most value to a home?

Industry surveys suggest an orangery typically adds 10–15% to property value, compared with 5–7% for a standard conservatory. Glass box extensions can add significant value for contemporary properties, but there is less published data.

What is the typical build time for each option?

Conservatories: 2–4 weeks. Orangeries: 6–12 weeks. Glass box extensions: 10–20 weeks, depending on complexity and structural engineering requirements.

Which option is most energy efficient?

Orangeries, with solid brick walls and a glass lantern, often provide the best thermal mass and insulation. However, a glass box extension specified with high-performance triple glazing and thermally broken frames can achieve excellent U-values, but it relies entirely on the glazing specification.

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✍️ Written by Room Outside — glazed extension specialists since 1973

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Call us anytime – David, our digital assistant, will take a few details so the right specialist can follow up personally. 01243 538999 or request a consultation online.

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Resources

Advice & Inspiration

Conservatories

Conservatory Refurbishment Costs: What You Get in 2026

Three-panel comparison image showing aluminium, timber and uPVC conservatory frame styles, with dark modern aluminium, warm natural timber and white uPVC frames.

Conservatories

Aluminium vs Timber vs uPVC: Choosing the Right Frame in 2026

Conservatories

Lantern Roofs Explained: When They Work, When They Don’t & What They Cost

roomoutsideuk

09th March, 2026

Aluminium vs Timber vs uPVC Frames: 2025 UK Energy & Value Impact

Premium Editorial

Aluminium vs Timber vs uPVC Frames: 2025 UK Energy & Value Impact

The foundation of every successful glass extension—why precision matters and what a thorough survey reveals about your project.

15 min read

Technical Deep-Dive

50+ Years Experience

Quick Answer

A site survey takes 2-4 hours and captures everything needed to manufacture your glass extension with precision. The surveyor measures your property to the millimetre, assesses ground conditions and drainage, locates services, evaluates structural connections, analyses orientation for thermal comfort, and documents everything with photographs.

This survey prevents problems: foundations designed for your specific ground, drainage routes planned around existing pipes, frames manufactured to fit perfectly, and potential issues identified before they become expensive surprises. Skip the survey (or rush it), and problems multiply.

What Gets Surveyed (And Why It Matters)

Dimensions: Every measurement to the millimetre—frames are manufactured to fit exactly
Ground levels: Determines floor heights, step thresholds, and drainage falls
Soil conditions: Clay, sand, rock—dictates foundation design and depth
Tree proximity: Roots affect ground movement; may require deeper foundations
Drainage: Existing drain locations, depths, and routes for rainwater
Services: Gas, electric, water positions to avoid during construction
Structural: Wall construction, lintel positions, load-bearing elements
Orientation: Sun path analysis for glazing specification and comfort

2-4

Hours on-site

100+

Measurements taken

±1mm

Measurement accuracy

Key survey stages

Why the Survey Matters More Than You Think

A glass extension isn’t assembled from standard parts pulled from a warehouse. Every frame, every glass panel, every roofing component is manufactured specifically for your project—cut and fabricated to dimensions unique to your property.

Get the measurements wrong, and nothing fits. Miss a drain, and you’re digging it up mid-build. Underestimate ground conditions, and foundations fail. Overlook a structural constraint, and the design doesn’t work.

The site survey is where precision begins. It’s the foundation upon which everything else is built—quite literally. A thorough survey costs time upfront but saves exponentially more in problems, delays, and compromises later.

The Survey vs. The Initial Consultation

These are different things:

Initial consultation: Discusses your requirements, explores design options, provides indicative pricing. Typically 1-2 hours. May include basic measurements.
Technical site survey: Captures precise measurements and technical data for manufacturing. Typically 2-4 hours. Happens after you’ve committed to proceed.

Some companies combine these; others separate them. Either way, you need both—the design conversation AND the technical precision.

The Eight Stages of a Thorough Survey

A comprehensive site survey follows a systematic process. Here’s what happens and why each stage matters:

Initial Walkthrough & Discussion

The surveyor reviews the agreed design with you, discusses any changes since the initial consultation, and identifies specific areas requiring attention.

Design confirmation and refinements
Access route discussion for construction
Identification of any concerns or constraints

External Measurements

Precise measurement of the house exterior where the extension connects, plus the full footprint of the proposed structure.

Wall dimensions and positions
Window and door locations (heights, widths, reveals)
Roof lines, fascias, guttering heights
Extension footprint and boundaries

Ground Level Analysis

Understanding how the ground slopes—both across the site and away from the house. This determines floor levels, threshold heights, and drainage falls.

Levels at house wall (existing floor height)
Ground slope across extension area
Relationship to garden levels
Step or ramp requirements

Drainage & Services Survey

Locating existing drains, manholes, water pipes, gas lines, and electrical supplies. Essential for avoiding services and planning rainwater drainage.

Manhole positions and depths
Drain routes and gradients
Soil/foul drain identification
Water, gas, electric locations

Structural Assessment

Evaluating the existing house structure where the extension will connect—wall construction, lintels, load paths, and any constraints.

Wall construction type (cavity, solid, timber frame)
Existing lintel positions and sizes
Load-bearing elements to consider
Connection details and weathering

Internal Measurements

Measuring connecting rooms—floor-to-ceiling heights, door positions, and internal features that affect the design or installation.

Ceiling heights and construction
Internal door dimensions and positions
Radiator and service locations
Floor construction and finishes

Photography & Documentation

Comprehensive photographic record of all relevant areas—reference material for the design team, manufacturing, and installation crews.

All elevations and connection points
Ground conditions and drainage
Neighbouring properties and boundaries
Access routes and site constraints

Design Review & Confirmation

Discussion of any issues identified, design adjustments if needed, and confirmation of the specification before manufacturing begins.

Review of any site-specific challenges
Design modifications if required
Specification confirmation
Timeline and next steps discussion

What Gets Measured (And How Precisely)

The level of precision required for glass extension manufacturing might surprise you. We’re not working in rough centimetres—we’re working in millimetres.

House Dimensions

Wall lengths, heights, window positions, roof lines—all to ±1mm accuracy

Ground Levels

Slope gradients, threshold heights, drainage falls—to ±5mm accuracy

Drain Depths

Invert levels, connection points, fall requirements—critical for compliance

Window Reveals

Opening sizes, frame depths, cill heights—for perfect frame integration

Roof Angles

Pitch, height at eaves and ridge, fascia details—for roof integration

Boundary Distances

Exact distances to property lines—for planning and Building Regs compliance

Why Millimetres Matter

Glass extension components are manufactured with tolerances of 1-2mm. A frame cut 10mm too long doesn’t “squeeze in”—it doesn’t fit at all. Glass panels are even less forgiving.

Modern surveying uses laser measuring equipment accurate to fractions of a millimetre. Combined with digital recording, this ensures data transfers accurately from site to factory to installation.

Ground Conditions: The Hidden Variable

What lies beneath the surface often determines more about your project than what’s visible above it. Ground conditions dictate foundation design—and foundation design significantly affects cost and complexity.

Ground Type	Characteristics	Foundation Implications
Clay	Expands when wet, shrinks when dry. Affected by trees.	Deeper foundations (often 1m+). May need special design near trees.
Sand/Gravel	Drains well, stable. Less affected by moisture changes.	Standard depth foundations. Good load-bearing capacity.
Chalk	Generally stable but can have voids or soft spots.	Depth depends on chalk quality. Investigation may be needed.
Rock	Excellent bearing capacity but difficult to excavate.	Shallow foundations possible. Excavation costs higher.
Made Ground	Previously disturbed soil—unpredictable.	May need piled foundations. Investigation essential.
High Water Table	Ground water close to surface.	Waterproofing measures. Possible pumping during construction.

The Tree Factor

Trees near your proposed extension significantly affect foundation design. Tree roots extract moisture from clay soils, causing ground movement. When trees are removed, the soil rehydrates and can heave upward.

The surveyor notes:

Tree species: Different trees have different root zones
Distance from extension: Closer trees = greater impact
Mature height: Influences root zone extent
Recent removal: Stumps or recently felled trees affect soil

Building Control uses NHBC guidelines to determine foundation depth based on these factors. In high-shrinkage clay with mature trees nearby, foundations might need to be 2.5m deep or more.

Drainage: Planning the Water Routes

Every glass extension needs to deal with rainwater—from the roof and from the area where your patio used to be. The survey identifies existing drainage and plans new connections.

What the Surveyor Looks For

Existing drain positions: Where are manholes and their depths?
Drain types: Surface water (rainwater) vs foul (sewage)—they’re separate systems
Connection points: Where can new rainwater drainage connect?
Fall requirements: Drains need gradient; is there enough?
Obstacles: Will new drains need to cross or divert existing ones?
Soakaways: If connection isn’t possible, can water soak into the ground?

The Manhole Investigation

Surveyors typically lift manhole covers to check:

Invert depth (the bottom of the drain)
Direction of flow
Whether it’s surface water or foul
Condition of existing drainage
Available connection points

This information is critical for Building Regulations approval and avoiding expensive mid-build discoveries.

Structural Assessment: Where Extension Meets House

The junction between your existing house and the new extension is critical. The surveyor assesses the existing structure to determine how the extension will connect safely and weathertight.

Key Structural Considerations

Wall construction: Cavity wall, solid brick, timber frame, or other? This affects fixing methods and weatherproofing details.
Lintel positions: Where are the existing lintels over windows and doors? New openings may be constrained by these.
Load paths: If creating a large opening to the extension, how do loads transfer around it?
First floor: What’s above the connection point? Affects structural options.
Existing extensions: If connecting to a previous addition, how was that built?

This assessment determines whether structural alterations are needed—new steel beams, padstones, or other support—and feeds into the Building Regulations submission.

Orientation & Solar Analysis

Understanding how your site relates to the sun’s path throughout the day and year is essential for specifying glazing and ensuring year-round comfort.

What Orientation Reveals

South-facing roofs: Maximum solar gain—requires high-performance solar control glazing
West-facing walls: Intense afternoon/evening sun—consider shading options
North-facing glass: Minimal direct sun—standard glazing may suffice
East-facing: Morning sun—generally manageable

The surveyor documents orientation and any shading from neighbouring buildings, trees, or your own house. This information determines glazing specification—particularly the solar control properties needed to prevent overheating.

Why This Matters for Comfort

A south-facing glass roof without proper solar control glazing can reach 40°C+ on sunny days—unusable. The right glazing specification, determined by understanding orientation, keeps the space comfortable year-round. Temperature-controlled glass is often essential for south and west-facing roofs.

Preparing for Your Site Survey

A little preparation helps the survey run smoothly and ensures nothing is missed.

Before the Surveyor Arrives:

Clear the area: Move garden furniture, plant pots, and obstructions from the extension footprint

Locate manholes: If covered by decking or paving, identify their positions if possible

Know your services: Where are your stopcock, fuse box, and gas meter?

Have documents ready: Property deeds, any existing plans or surveys, previous extension paperwork

Consider access: Think about how construction vehicles would reach your garden

Be available: Plan to be present throughout—your input is valuable

After the Survey: What Happens Next

The survey data flows into the next stages of your project:

Technical Drawings Produced

Detailed CAD drawings showing exactly how your extension fits your property, with all dimensions confirmed.

Typically 1-2 weeks

Final Specification Confirmed

Any adjustments identified during the survey are incorporated. You receive the final specification for approval.

Included in above

Building Regulations Submission

Technical drawings submitted to Building Control or Approved Inspector for approval.

4-6 weeks for approval

Manufacturing Begins

Once approved and final payment stage reached, components are manufactured to your survey dimensions.

4-6 weeks typically

Room Outside

Glass Extension Specialists | Established 1973 | 50+ Years Experience

Room Outside has been surveying and building conservatories, orangeries, and glass extensions for over 50 years. Our experienced surveyors ensure every project starts with the precision it deserves. Call 01243 538999 to begin your project.

About This Article

This guide draws on 50+ years of Room Outside’s experience conducting site surveys across Kent, Surrey, Sussex, Hampshire, and London. The process described reflects our approach refined over thousands of successful projects.

Last updated: March 2026 | Author: Room Outside Technical Team

Frequently Asked Questions

What happens during a conservatory site survey?

A comprehensive survey takes 2-4 hours covering: precise measurements of house and extension area, ground level analysis, drainage assessment, structural evaluation, service locations, orientation analysis, and photography. The surveyor also discusses design refinements.

How long does a site survey take?

Typically 2-4 hours depending on complexity. Simple conservatories on straightforward sites may be quicker; complex orangeries, sloping sites, or properties with access challenges take longer.

Do I need to be home for the site survey?

Yes. The surveyor needs internal access and your input is valuable for discussing requirements, reviewing the design, and identifying any concerns. Plan to be available throughout.

What should I prepare before a site survey?

Clear the extension area, locate manholes, know where your services are (stopcock, fuse box), have property documents ready, and think about construction access routes.

Why do surveyors check ground conditions?

Ground conditions determine foundation design. Clay requires deeper foundations than sand. Trees nearby affect depth requirements. High water tables need special solutions. Understanding this prevents structural problems.

What measurements are taken during a site survey?

External house dimensions, window/door positions, ground levels, drain locations and depths, roof heights, internal room measurements, boundary distances—all typically to ±1mm accuracy.

Is the site survey free?

Policies vary. Some companies offer free surveys; others charge £150-£500, often refundable if you proceed. Ask upfront about costs.

What happens after the site survey?

Technical drawings are produced (1-2 weeks), final specification confirmed, Building Regulations submitted (4-6 weeks approval), then manufacturing begins. You receive detailed drawings showing exactly how the extension fits.

Call us anytime – David, our digital assistant, will take a few details so the right specialist can follow up personally. 01243 538999 or request a consultation online

Ready to Start Your Project?

Every successful glass extension begins with a thorough understanding of your site. Our experienced team combines precision surveying with creative design to ensure your project is built on solid foundations—literally and figuratively.

Book Free Consultation

Call us anytime on 01243 538999 – David, our digital assistant, will take a few details so the right specialist can follow up personally.

Room Outside: Glass extension specialists since 1973.
Serving Kent, Surrey, Sussex, Hampshire, London & surrounding areas.

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How to Choose the Right Company for Your Glass Extension: A Discerning Buyer’s Framework | Room Outside

roomoutsideuk

09th March, 2026

How to Choose the Right Company for Your Glass Extension: A Discerning Buyer’s Framework | Room Outside

Buyer’s Guide 2026

How to Choose the Right Company for Your Glass Extension

A Discerning Buyer’s Framework: 25 questions to ask, red flags to avoid, and how to identify a company worthy of your trust and investment.

18 min read

25 Essential Questions

Red Flags to Avoid

Quick Answer

Choose a company with: 10+ years trading history, verifiable completed projects, detailed written quotes, insurance-backed guarantees, proper accreditations (FENSA, GGF), and no high-pressure sales tactics. Get 3-4 quotes but don’t choose on price alone—compare specifications and evaluate the companies themselves.

Avoid companies that: pressure you to sign today, demand large deposits upfront (over 15%), won’t provide references, give vague verbal quotes, don’t discuss Building Regulations, or have no traceable business history. Trust your instincts—if something feels wrong, walk away.

The Discerning Buyer’s Checklist

Trading history: Look for 10+ years in business with traceable records
Fixed address: Established premises or showroom you can visit
Portfolio: Real completed projects you can see (not just stock photos)
References: Recent customers willing to speak with you
Detailed quotes: Written, itemised, with clear specifications
Insurance-backed guarantees: Protection if the company ceases trading
Accreditations: FENSA, GGF, TrustMark, or equivalent
Deposit: Maximum 10-15%, staged payments thereafter
No pressure: Time to consider without “today only” discounts
Building Regs: Clear explanation of compliance responsibilities

10+

Years trading minimum

3-4

Quotes to compare

15%

Max deposit

High-pressure tactics

Why Choosing the Right Company Matters

A glass extension is a significant investment—typically £30,000 to £150,000+ depending on specification. You’re entrusting a company with your home, your money, and months of your life during the project. The difference between a good company and a poor one isn’t just the finished result; it’s the entire experience from first enquiry to final handover and beyond.

The conservatory and glass extension industry, like all home improvement sectors, has its share of excellent companies, mediocre operators, and outright rogues. The excellent companies deliver projects that exceed expectations, handle problems professionally, and leave customers genuinely delighted. The poor ones create stress, disappointment, and sometimes financial loss.

This guide will help you identify which is which before you commit.

A Note on Transparency

We’re Room Outside—a conservatory and glass extension company since 1973. Yes, we’d like you to consider us for your project. But more importantly, we want you to make a good decision, whoever you choose. A well-informed buyer asks better questions, recognises quality, and ultimately gets a better result. If we’re the right fit, that process will reveal it. If another company is better for your specific needs, you’ll discover that too.

Red Flags vs Green Flags

Some warning signs should end a conversation immediately. Others are positive indicators that suggest a company operates professionally. Here’s what to watch for:

Red Flags

Walk Away If You See These

“Sign today” pressure: Discounts that expire when the salesperson leaves
Large deposits: Requests for 30%+ upfront or full payment before completion
No fixed address: PO Box only, no premises you can visit
Cash discounts: Suggests tax avoidance and reduces your protection
Won’t provide references: Reluctance to connect you with past customers
Vague quotes: “About £X” without written specification
No Building Regs discussion: Ignoring compliance responsibilities
Pushy behaviour: Won’t leave until you sign, returns repeatedly
Stock photos only: No real portfolio of their own work
Recently formed company: Trading only 1-2 years (phoenix company risk)

Green Flags

Positive Indicators of Quality

Established history: 10+ years trading under the same name
Showroom: Physical premises you can visit and see products
Genuine portfolio: Real projects with locations you could verify
Happy to provide references: Confident in customer satisfaction
Detailed written quotes: Itemised, with clear specifications
No pressure: Encourages you to take time and compare
Clear on Building Regs: Explains compliance and handles it for you
Insurance-backed guarantees: Protection beyond the company itself
Professional accreditations: FENSA, GGF, TrustMark, etc.
Own installation teams: Employees, not rotating subcontractors

25 Questions to Ask Every Company

These questions reveal a company’s professionalism, capability, and trustworthiness. The answers—and how they’re delivered—tell you a great deal.

About the Company

How long have you been trading under this name?

Look for 10+ years. Shorter histories may indicate a “phoenix” company—reformed after previous failure.

What’s your registered business address?

Should be traceable premises, not just a PO Box. Can you visit?

Can I see your portfolio of completed projects?

Real projects with locations—not just stock images or renders.

Can I speak with recent customers or visit a completed project?

Confident companies welcome this. Reluctance is a red flag.

What accreditations and memberships do you hold?

FENSA, GGF, TrustMark, Which? Trusted Trader, ISO certifications.

About the Project

Who will design my project?

In-house designers vs. salesperson with a catalogue? Design expertise matters.

What materials do you use for frames?

Specific systems and manufacturers—not generic “aluminium” or “uPVC.”

What glazing specification do you use?

Glass type, U-values, solar control, manufacturer. Specifics indicate expertise.

Who handles Building Regulations and planning?

Should be clear on responsibilities and ideally handle this for you.

Do you use your own installation teams or subcontractors?

Own teams typically mean better quality control and accountability.

Who will be my point of contact throughout the project?

A dedicated project manager vs. “call the office” is preferable.

What’s included in the price?

Foundations? Electrics? Flooring? Decoration? Get clarity on inclusions.

What’s NOT included?

Exclusions are just as important. Hidden extras destroy budgets.

About Money and Protection

What deposit do you require?

10-15% is reasonable. Over 25-30% is a warning sign.

What’s the payment schedule?

Should be staged against milestones, not front-loaded.

When is the final payment due?

Should be on satisfactory completion—not before you’re happy.

What warranties do you offer?

Frame guarantee, glass unit guarantee, workmanship warranty—get specifics.

Are your guarantees insurance-backed?

Critical. Without this, a 25-year warranty is worthless if they close in year 3.

Who provides the insurance backing?

Should be a recognisable insurer you can verify.

About Problems and After-Care

What happens if something goes wrong during the build?

How do they handle problems? Clear process vs. vague assurances.

What’s your process for snagging and final inspection?

Formal sign-off process ensures issues are resolved before final payment.

How do I report problems after completion?

Clear after-care contact, not “call the mobile of whoever installed it.”

What’s your typical response time for warranty issues?

Specific commitment vs. “we’ll get to it when we can.”

What documents will I receive at completion?

Building Regs certificate, electrical certificate, warranties, manuals.

Can I see your standard contract?

Review before committing. Clear, fair terms indicate professionalism.

Understanding Quotes: Price vs Value

Getting multiple quotes is sensible—but comparing them requires care. The cheapest quote is rarely the best value, and sometimes the most expensive isn’t either.

What a Good Quote Should Include

Quote Checklist:

Detailed specification: Frame system, colour, glazing spec, roof type, hardware

Clear dimensions: Size, layout, and configuration confirmed

Inclusions list: Everything covered by the price—foundations, electrics, etc.

Exclusions list: What’s NOT included—equally important

Payment terms: Deposit amount, stage payments, final payment timing

Timeline: Estimated start date and completion

Warranty details: What’s covered, for how long, insurance backing

Quote validity: How long the price is valid (typically 30-90 days)

Why the Cheapest Quote Often Isn’t Cheapest

A significantly lower quote usually means one of these:

Inferior materials: Cheaper frames, basic glazing, lower-spec hardware
Missing items: Foundations, electrics, finishing work not included
Less experienced installers: Cheaper labour, potentially lower quality
No insurance backing: Warranty worthless if they go bust
Extras added later: Low quote to win the job, then variations increase cost

The “Like-for-Like” Test

Before concluding one quote is better value, check they’re quoting the same thing. Compare:

Frame system and manufacturer (not just “aluminium”)
Glass specification and U-values
Foundation type and depth
Electrical scope (how many sockets, what lighting)
Flooring inclusion or exclusion
Internal finishes (plastering, decoration)
Warranty length and insurance backing

A quote £15,000 lower that excludes foundations, electrics, and flooring isn’t actually cheaper.

Accreditations Worth Looking For

Trade accreditations indicate a company meets certain professional standards. Not all accreditations are equal—some are rigorous, others less so. Here are the meaningful ones:

FENSA

Government-authorised scheme for self-certifying window/door installations meet Building Regulations.

GGF

Glass and Glazing Federation—industry body with codes of practice and consumer protection.

TrustMark

Government-endorsed quality scheme. Requires financial checks and customer protection.

Which? Trusted Trader

Vetted by Which? with ongoing customer feedback monitoring.

Checkatrade

Verified reviews and basic vetting. Useful but less rigorous than TrustMark.

Manufacturer Approved

Authorised installer for specific systems (e.g., Schüco, Origin). Indicates training and support.

No accreditation guarantees perfection, but membership indicates a company is willing to meet external standards and be held accountable. Complete absence of any accreditations is concerning.

Warranties and Guarantees: What Really Protects You

Warranty claims are meaningless if the company has ceased trading—which is why insurance-backed guarantees (IBGs) are essential.

Warranty Type	What It Covers	Typical Duration
Frame guarantee	Structural integrity, finish, hardware	10-25 years
Sealed unit guarantee	Misting, failed seals in double/triple glazing	5-10 years
Workmanship warranty	Installation defects, water ingress, settling	2-10 years
Insurance-backed guarantee	Protection if installer ceases trading	10-25 years

The Insurance-Backed Guarantee Test

When a company offers an insurance-backed guarantee, verify:

Who underwrites it? Should be a recognisable insurance company
Can you get documentation? Certificate issued directly to you
What’s actually covered? Read the terms, not just the headline
Is the insurer legitimate? Check FCA register if unsure

A “25-year guarantee” from a company that might not exist in 5 years—without insurance backing—is worthless paper.

The Consultation: What to Observe

The initial consultation reveals much about how a company operates. Pay attention to:

Positive Signs

Listening first: They ask about your needs before launching into a pitch
Technical knowledge: Can answer questions about materials, Building Regs, thermal performance
Honest about limitations: Will say “that won’t work” rather than promising everything
No pressure: Comfortable with you getting other quotes and taking time
Clear on process: Explains how the project would work from start to finish
Brings samples: Shows actual materials, not just brochures
Provides written quote: Detailed, to follow up after the visit

Warning Signs

All talk, no listen: Pushes their agenda without understanding yours
Vague on details: Can’t explain materials or specifications clearly
Promises everything: No project constraints, no complications—suspicious
Pressure tactics: “This price is only valid today,” “I need to call my manager”
Won’t leave: Sits for hours, returns repeatedly, creates obligation
Verbal quote only: Reluctant to put it in writing
Disparages competitors: Professional companies focus on their own merits

Final Checklist: Before You Sign

Complete This Before Committing:

Verified trading history — Companies House check, 10+ years trading

Spoken to references — Contacted recent customers directly

Seen completed work — Visited a project or viewed genuine portfolio

Compared 3-4 quotes — Like-for-like specification comparison

Understood inclusions/exclusions — Know exactly what’s in the price

Confirmed insurance-backed guarantee — Verified the underwriter

Read the contract — Full terms, not just headline promises

Comfortable with the company — Trust your instincts about the relationship

Room Outside

Glass Extension Specialists | Established 1973 | 50+ Years Experience

Room Outside has been designing and building conservatories, orangeries, and glass extensions since 1973. We welcome the questions in this guide—because we know our answers stand up to scrutiny. Call 01243 538999 to start a conversation.

About This Guide

This buyer’s guide draws on 50+ years of Room Outside’s experience in the conservatory and glass extension industry. The advice reflects our observations of what distinguishes reputable companies from problematic operators.

Last updated: March 2026 | Author: Room Outside

Frequently Asked Questions

How do I choose a good conservatory company?

Look for 10+ years trading history, verifiable portfolio, detailed written quotes, insurance-backed guarantees, trade accreditations (FENSA, GGF), and no high-pressure sales. Get 3-4 quotes and compare specifications, not just prices.

What questions should I ask a conservatory company?

Key questions: How long have you traded? Can I visit completed work? Who manages my project? What’s included/excluded? Who handles Building Regs? What warranties do you offer? Are guarantees insurance-backed? What’s the payment schedule?

What are the red flags when choosing a conservatory installer?

Warning signs: “Sign today” pressure, large deposits (over 15%), no fixed address, cash discounts, won’t provide references, vague quotes, no Building Regs discussion, pushy salespeople, stock photos only, recently formed company.

Should I get multiple quotes for a conservatory?

Yes, 3-4 quotes is advisable. But compare like-for-like specifications, check inclusions/exclusions, and evaluate the companies themselves. The cheapest quote often excludes items or uses inferior materials—rarely the best value.

What warranties should a conservatory company offer?

Look for: 10-year frame guarantee, 5-10 year sealed unit guarantee, workmanship warranty, and critically—insurance-backed guarantee protecting you if the company ceases trading. Verify the insurer is legitimate.

How much deposit should I pay for a conservatory?

10-15% deposit is reasonable, with staged payments at milestones (materials delivery, frame installation, completion). Be wary of 30%+ upfront or full payment before completion. Final balance should be on satisfactory completion only.

What accreditations should a conservatory company have?

Useful accreditations: FENSA (self-certifying installations), GGF membership, TrustMark (government-endorsed), Which? Trusted Trader, manufacturer approvals. These indicate professional standards and accountability.

Should I visit a conservatory showroom?

If possible, yes. Showrooms let you see build quality, glazing, and finishes firsthand. Companies with showrooms have invested in their business—a positive indicator. But excellent companies can operate without showrooms too.

Call us anytime – David, our digital assistant, will take a few details so the right specialist can follow up personally. 01243 538999 or request a consultation online

Ready to Find the Right Company?

We’ve been building glass extensions since 1973. We welcome your questions, encourage you to compare us with others, and are confident our answers—and our work—will speak for themselves.

Book Free Consultation

Call us anytime on 01243 538999 – David, our digital assistant, will take a few details so the right specialist can follow up personally.

Room Outside: Glass extension specialists since 1973.
Serving Kent, Surrey, Sussex, Hampshire, London & surrounding areas.

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Aluminium vs Timber vs uPVC: Choosing the Right Frame in 2026

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Conservatory vs Orangery vs Glass Box: Buyer’s Framework

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Frameless Glass Roof Extensions | 2026 Guide | Room Outside

roomoutsideuk

07th March, 2026

Building Regulations for Glass Extensions: What Your Installer Must Get Right

Building Regulations Guide 2026

Building Regulations for Glass Extensions: What Your Installer Must Get Right

The complete UK guide to Part L, Part P, glazing safety, exemptions, and compliance—everything you need to know before your project begins.

18 min read

Updated March 2026

England & Wales

Quick Answer

Most conservatories are EXEMPT from Building Regulations if they meet all these criteria: floor area under 30m², built at ground level, thermally separated from the house by external-quality doors/windows, independent heating with separate controls, and glazing meeting safety standards.

You WILL need full Building Regulations approval if: the conservatory exceeds 30m², you remove the separating doors, the structure has a solid roof (orangery-style), or you’re building something other than a true conservatory. Part P electrical requirements apply regardless of exemption status.

Key Facts: Glass Extension Building Regulations (2026)

Exemption threshold: Conservatories under 30m² with thermal separation are generally exempt
Thermal separation requirement: External-quality doors/windows must remain between conservatory and house
Part L (Thermal): Non-exempt extensions require walls at 0.28 W/m²K, roofs at 0.16 W/m²K
Part P (Electrical): All electrical work must be certified regardless of exemption status
Part K (Glazing): Safety glass mandatory below 800mm and in/near doors
Removing doors: Exemption LOST—full compliance required retrospectively
Completion certificate: Essential for property sale—solicitors check for these
Approved Inspectors: Alternative to local authority Building Control

30m²

Max exempt floor area

0.28

Wall U-value (W/m²K)

1.4

Window U-value (W/m²K)

800mm

Safety glass threshold

Understanding the Conservatory Exemption

Building Regulations exist to ensure buildings are safe, energy-efficient, and accessible. Unlike planning permission (which controls what you can build and where), Building Regulations control how you build—the technical standards that must be met.

Conservatories benefit from a specific exemption in the Building Regulations, but this exemption has strict conditions. Understanding these conditions is essential because losing the exemption means full compliance is required—often at significant cost.

The Five Conditions for Exemption

ALL Five Conditions Must Be Met:

Floor area under 30m² — measured internally

Built at ground level — not on an upper floor or raised platform

Thermally separated — external-quality walls, doors, or windows between conservatory and house

Independent heating — with separate controls, not connected to main house system

Glazing compliance — safety glass in all required locations (Part K)

Critical: Part P Still Applies

Even if your conservatory is exempt from most Building Regulations, Part P (Electrical Safety) still applies. All electrical work must be carried out by a competent person registered with NICEIC, NAPIT, or similar scheme, OR inspected and certified by Building Control. This includes lighting, sockets, underfloor heating, and any fixed electrical installation.

The Building Regulations Parts Explained

Building Regulations are divided into “Parts” (also called Approved Documents), each covering a different aspect of construction. Several Parts apply to glass extensions:

Part L: Conservation of Fuel & Power

Thermal performance requirements

Sets minimum thermal performance standards to reduce energy consumption. For non-exempt extensions:

Walls: U-value ≤ 0.28 W/m²K
Roof: U-value ≤ 0.16 W/m²K
Floor: U-value ≤ 0.18 W/m²K
Windows/doors: U-value ≤ 1.4 W/m²K
Roof windows: U-value ≤ 1.6 W/m²K

Part P: Electrical Safety

Always applies—even if exempt

Covers electrical installations in dwellings. Requirements:

Work must meet BS 7671 wiring regulations
Must be done by competent person OR certified by Building Control
Competent person schemes: NICEIC, NAPIT, ELECSA, etc.
Installation certificate must be issued
Applies to all new circuits, not just major work

Part K: Protection from Falling & Impact

Glazing safety requirements

Requires safety glazing in “critical locations”:

All glass below 800mm from floor level
Glass in doors up to 1500mm height
Glass within 300mm of doors, up to 1500mm
Safety glass: toughened (BS EN 12150) or laminated (BS EN ISO 12543)
Must be permanently marked with standard

Part A: Structure

Structural stability and foundations

Ensures the structure is stable and adequately supported:

Foundations adequate for ground conditions
Structure designed to carry loads safely
Resistance to ground movement
May require engineer’s calculations
Tree proximity often requires deeper foundations

Part M: Access & Use

Accessibility requirements

Promotes accessibility for all users:

Level or ramped threshold access preferred
Door widths adequate for wheelchair access
Step-free access where reasonably practicable
Requirements less stringent for domestic extensions
Good practice even if not strictly required

Part B: Fire Safety

Means of escape and fire spread

Ensures safe escape in fire situations:

Generally minimal requirements for single-storey extensions
May apply if conservatory affects escape routes
Fire spread to boundaries considered
More relevant for attached garages or bedrooms
Smoke alarms should be extended if appropriate

When the Exemption Does NOT Apply

Several situations mean your glass extension cannot benefit from the conservatory exemption and requires full Building Regulations approval:

Situation	Exempt?	What’s Required
Conservatory under 30m², thermally separated	Yes	Part P electrical certification only
Conservatory over 30m²	No	Full Building Regulations approval
Doors removed (no thermal separation)	No	Full compliance including Part L upgrades
Solid roof (orangery-style)	No	Full Building Regulations approval
Connected to main heating system	No	Full Building Regulations or separate controls
Built above ground floor	No	Full Building Regulations approval
Glass extension (not conservatory)	Depends	Likely requires full approval

The Door Removal Problem

This is the most common compliance issue we encounter. Many homeowners remove the doors between conservatory and house to create an open-plan space. The moment you do this:

The conservatory exemption no longer applies
The space becomes part of your home’s heated envelope
Full Part L compliance is required retrospectively
This typically means upgrading glazing to achieve required U-values
Roof performance becomes critical (0.16 W/m²K is challenging for glass)
Costs can be significant—often £10,000-£30,000+ depending on size

If you want an open-plan connection, plan for Building Regulations compliance from the outset.

Part L in Detail: The Thermal Challenge

Part L (Conservation of Fuel and Power) presents the biggest technical challenge for glass extensions that don’t qualify for exemption. The 2021 update to Part L significantly increased requirements, and further tightening came in 2025.

Current U-Value Requirements (2026)

Element	Required U-Value	Typical Solution
External walls	≤ 0.28 W/m²K	Insulated cavity wall or SIPs
Roof (pitched)	≤ 0.16 W/m²K	Solid insulated roof with rooflights
Roof (flat)	≤ 0.16 W/m²K	Insulated warm roof construction
Floor	≤ 0.18 W/m²K	Insulated concrete slab
Windows & doors	≤ 1.4 W/m²K	High-performance double/triple glazing
Roof windows/skylights	≤ 1.6 W/m²K	Premium roof glazing units

The Glass Roof Dilemma

Here’s the challenge: if your extension has a primarily glass roof and isn’t exempt, achieving the 0.16 W/m²K roof requirement with glazing is technically impossible with current technology. Even the best triple-glazed units achieve around 0.7-1.0 W/m²K.

Solutions include:

Hybrid roof design: Solid insulated perimeter with central glass lantern—the orangery approach
Compensating calculation: Improving other elements (walls, floor) beyond minimum to offset the glass roof’s underperformance
SAP calculation: Whole-building energy modelling demonstrating overall compliance
Limiting glazed area: Keeping glass roof area small relative to solid sections

The Compensating Calculation Approach

Building Regulations allow flexibility through “compensating calculations.” If one element underperforms, others can exceed minimum standards to achieve overall compliance. For glass-roof extensions, this might mean:

Walls significantly exceeding 0.28 W/m²K (e.g., achieving 0.15)
Floor insulation beyond minimum (e.g., 0.12 W/m²K)
Premium glazing throughout (triple-glazed, argon-filled)

A thermal modelling specialist or your Building Control officer can advise on what’s achievable for your specific design.

Part P: Electrical Safety (Always Applies)

Whether or not your conservatory is exempt from other Building Regulations, Part P electrical requirements always apply. This is a common area of non-compliance—and a significant risk.

What Part P Requires

Competent person installation: Electrical work should be carried out by an electrician registered with a competent person scheme (NICEIC, NAPIT, ELECSA, etc.)
Self-certification: Registered electricians can self-certify their work and notify Building Control on your behalf
Building Control route: If using an unregistered electrician, you must notify Building Control before work starts, pay a fee, and have the work inspected
Certification: You must receive an Electrical Installation Certificate (for new circuits) or Minor Works Certificate (for smaller work)

Conservatory Electrical Work Includes:

Lighting circuits
Socket outlets
Underfloor heating controls
Electric underfloor heating elements
Outdoor lighting connected to the conservatory
Audio/visual wiring if fixed
Smart home system wiring

Why This Matters When Selling

Solicitors conducting property searches will ask for Part P certificates for any electrical work done since 2005. Missing certificates create complications during property sales—potentially requiring retrospective inspection (expensive) or indemnity insurance. Ensure you receive and retain electrical certificates.

Glazing Safety: Part K Requirements

Glass in “critical locations” must be safety glass—either toughened (which shatters into small, relatively harmless pieces) or laminated (which holds together when broken). This requirement applies even to exempt conservatories.

Critical Locations Defined

Location	Requirement
All glazing below 800mm from floor level	Safety glass mandatory
Glazing in doors (any part of door)	Safety glass mandatory up to 1500mm
Glazing within 300mm of door edge	Safety glass mandatory up to 1500mm
Overhead glazing (roof glass)	Must not cause injury if broken—typically laminated
Glass balustrades or barriers	Structural glazing requirements apply

Safety Glass Standards

Toughened glass: BS EN 12150—must be permanently marked
Laminated glass: BS EN ISO 12543—must be permanently marked
Marking location: Usually etched or sandblasted in corner of pane
Roof glazing: Inner pane should be laminated (holds together if broken)

Checking Your Existing Glazing

Look in the corner of each glass pane for a small etched mark showing the safety standard (BS EN 12150 for toughened, BS EN ISO 12543 for laminated). If there’s no mark in critical locations, the glass may not be safety glass—a compliance issue that could need addressing, particularly if selling the property.

Building Control or Approved Inspector?

For non-exempt glass extensions, you’ll need Building Regulations approval. You have two options for obtaining this:

Aspect	Local Authority Building Control	Approved Inspector
Provider	Your local council	Private company
Legal status	Equivalent—both can issue valid certificates	Equivalent—both can issue valid certificates
Typical cost	Fixed fees, often competitive	Competitive, may offer packages
Speed	Can be slower in busy periods	Often faster response times
Flexibility	Standard processes	May offer more flexible inspection times
Local knowledge	Deep knowledge of local conditions	May be less familiar with local issues

Many installers work regularly with specific Approved Inspectors and can arrange this as part of their service. Either route leads to the same legal outcome—a completion certificate confirming compliance.

Common Mistakes Installers Make

After 50+ years building glass extensions, we’ve seen many compliance problems—often created by less experienced installers. Here are the most common issues:

Watch Out For These Red Flags:

“You don’t need Building Regs for a conservatory” — True only if ALL exemption conditions are met. Many installers oversimplify this.

No Part P electrical certificate provided — Electrical work ALWAYS needs certification. Demand your certificate at completion.

Suggesting door removal is “fine” — Removing thermal separation without addressing Building Regulations is a compliance breach.

Non-safety glass in critical locations — All glass below 800mm and in/near doors must be safety glass. Check for BS marking.

Inadequate foundations near trees — Tree root activity requires deeper foundations. Failure here causes structural movement.

Connecting heating to main system — Lose exemption if the conservatory heating isn’t independently controlled.

What Documents Should You Receive?

At project completion, ensure you receive the following documentation—these are essential for future property sales:

For Exempt Conservatories:

Part P Electrical Certificate — Electrical Installation Certificate or Minor Works Certificate
Building Control notification — if an unregistered electrician was used
Glazing certificates — confirming safety glass compliance
Structural warranty — if provided by installer
Product warranties — frames, glazing, hardware

For Non-Exempt Extensions:

All of the above, PLUS:
Building Regulations Completion Certificate — from Building Control or Approved Inspector
Structural engineer’s calculations — if required
Energy Performance Certificate (EPC) — may be required depending on circumstances

Store Documents Safely

Keep all completion certificates, warranties, and compliance documents with your property deeds. When you sell, your solicitor will request these—missing documents can delay or complicate sales, potentially requiring retrospective inspections or indemnity insurance.

Room Outside

Glass Extension Specialists | Established 1973 | 50+ Years Experience

Room Outside designs and builds conservatories, orangeries, and glass extensions with full Building Regulations compliance. We handle all approvals, certifications, and documentation—giving you complete peace of mind. Call 01243 538999 for expert advice.

Areas We Cover

Room Outside designs and builds compliant glass extensions across the South East of England:

Kent Surrey East Sussex West Sussex Hampshire London Berkshire Essex

Sources, References, and Further Reading

Official Sources: Building Regulations 2010 (as amended); Approved Document L (Conservation of Fuel and Power); Approved Document P (Electrical Safety); Approved Document K (Protection from Falling, Collision and Impact); Planning Portal guidance.

Industry Experience: Room Outside – 50+ years experience delivering Building Regulations compliant glass extensions.

Note: This guide covers England and Wales. Scotland and Northern Ireland have different Building Regulations systems.

Last updated: March 2026 | Expert review: Requirements verified against current legislation

Frequently Asked Questions

Do glass extensions need Building Regulations approval?

It depends. Conservatories are often exempt if under 30m², thermally separated from the house, with independent heating and compliant glazing. Orangeries, solid-roof extensions, and structures without thermal separation require full Building Regulations approval.

What is thermal separation and why does it matter?

Thermal separation means maintaining external-quality doors/windows between the conservatory and house. This preserves the house’s thermal envelope. Remove these doors and the exemption no longer applies—full Part L compliance becomes required.

What are the Part L requirements for glass extensions?

Part L sets thermal performance standards: walls ≤0.28 W/m²K, roofs ≤0.16 W/m²K, floors ≤0.18 W/m²K, windows/doors ≤1.4 W/m²K. Glass roofs face challenging requirements that often need compensating through other elements.

Do I need Building Regulations for electrical work?

Yes—Part P applies regardless of whether the conservatory is otherwise exempt. Electrical work must be done by a registered competent person (NICEIC, NAPIT, etc.) who self-certifies, OR inspected by Building Control. Always obtain your electrical certificate.

What glazing safety requirements apply?

Part K requires safety glass (toughened or laminated) below 800mm from floor level, in doors, and within 300mm of doors up to 1500mm height. Safety glass must be permanently marked with BS EN 12150 (toughened) or BS EN ISO 12543 (laminated).

What happens if I remove the conservatory doors?

The exemption no longer applies. The space becomes part of your home’s heated envelope, requiring full Part L compliance retrospectively. This typically means upgrading glazing, improving roof insulation, and potentially the heating system—often £10,000-£30,000+.

Do I need a completion certificate?

For exempt conservatories, only Part P electrical certification is required. For non-exempt extensions, you must receive a completion certificate from Building Control or an Approved Inspector. Solicitors check for these when you sell your property.

What’s the difference between Building Control and Approved Inspector?

Both can oversee Building Regulations compliance with equal legal standing. Building Control is your local authority service; Approved Inspectors are private companies. Both issue valid completion certificates. Many installers work with specific Approved Inspectors.

Call us anytime – David, our digital assistant, will take a few details so the right specialist can follow up personally. 01243 538999 or request a consultation online

Need a Compliant Glass Extension?

We handle all Building Regulations requirements, from initial design through to completion certificates. Every project is delivered with full documentation—giving you complete peace of mind now and when you sell.

Book Free Consultation

Call us anytime on 01243 538999 – David, our digital assistant, will take a few details so the right specialist can follow up personally.

Room Outside: Glass extension specialists since 1973.
Serving Kent, Surrey, Sussex, Hampshire, London & surrounding areas.

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Site survey process for glass extensions, featuring a professional measuring dimensions, assessing ground conditions, checking drainage, and conducting soil tests, with labeled areas for utilities, orientation, and structural assessment.

Design & Planning

Site Surveys Explained: What Happens Before a Single Pane of Glass Is Ordered

roomoutsideuk

04th March, 2026

Do I Need Planning Permission for a Conservatory? Every Scenario Explained

Planning Guide 2026

Do I Need Planning Permission for a Conservatory? Every Scenario Explained

The complete UK guide to conservatory planning permission. Find out exactly when you need it, when you don’t, and every scenario in between—from size limits to listed buildings.

16 min read

Updated March 2026

UK Wide

Quick Answer

Most conservatories do NOT need planning permission under Permitted Development rights. Your conservatory is likely exempt if: it’s single storey, maximum 3m depth for attached houses (4m detached), maximum 4m height, not higher than existing eaves, doesn’t cover more than 50% of your garden, and isn’t forward of the front of your house.

You WILL need planning permission if: your home is a listed building, you want to exceed size limits, your Permitted Development rights have been removed by an Article 4 Direction, or the conservatory will be forward of the principal elevation facing a highway.

Key Facts: Conservatory Planning Permission (UK 2026)

Maximum depth (attached house): 3m from original rear wall (or 4m single storey under Larger Home Extension scheme)
Maximum depth (detached house): 4m from original rear wall (or 8m under Larger Home Extension scheme)
Maximum height: 4m, or no higher than existing eaves—whichever is lower
Near boundary height: If within 2m of boundary, maximum eaves height is 3m
Garden coverage: Total extensions and outbuildings must not exceed 50% of original garden
Building Regs exemption: Under 30m², thermally separated from house, glazing requirements met
Larger Home Extension scheme: Extended to 2028—allows up to 6m (attached) or 8m (detached) with prior approval
Application cost: Householder planning application £258; Lawful Development Certificate £258

Max depth (attached)

Max depth (detached)

50%

Max garden coverage

30m²

Building Regs exempt

Understanding Permitted Development for Conservatories

Permitted Development (PD) is a national grant of planning permission that allows certain building works without submitting a planning application. Most conservatories fall within these rights, meaning you can build without formal permission—provided you meet specific criteria.

The rules are set out in the Town and Country Planning (General Permitted Development) (England) Order 2015 (as amended), specifically Schedule 2, Part 1, Class A for extensions. Similar rules apply in Wales, Scotland, and Northern Ireland with some variations.

Definition: What Counts as a “Conservatory”?

For Building Regulations purposes, a conservatory must have:

At least 50% of the wall area glazed
At least 75% of the roof area glazed or translucent
Thermal separation from the house (external-quality doors/windows between)
Independent heating controls (not connected to main house heating)

For planning permission purposes, conservatories are treated the same as other single-storey rear extensions—the same size limits apply regardless of how much glass is used.

Every Scenario Explained: Do You Need Permission?

Let’s break down every common scenario. Find your situation below for a clear yes/no answer.

No Permission Needed

Standard rear conservatory under 3m (attached house)

A single-storey rear conservatory up to 3m deep, under 4m high, not within 2m of boundary or with eaves under 3m if it is. Covered by Permitted Development.

No Permission Needed

Rear conservatory under 4m (detached house)

Detached houses have more generous limits—up to 4m depth from the original rear wall without planning permission, subject to other PD criteria.

No Permission Needed

Conservatory with prior approval (up to 6m/8m)

Under the Larger Home Extension scheme, you can build up to 6m (attached) or 8m (detached) with neighbour notification and council prior approval—not full planning permission.

Maybe

Conservatory in a Conservation Area

Rear conservatories may be permitted, but no side extensions or cladding allowed. Check for Article 4 Directions that may remove PD rights entirely.

Permission Required

Conservatory on a listed building

ALL external works on listed buildings require Listed Building Consent, and usually planning permission too. No exceptions for size.

Permission Required

Front or side conservatory facing highway

Conservatories forward of the principal elevation facing a highway always need planning permission—even small ones.

Permission Required

Conservatory exceeding 50% garden coverage

If your conservatory plus other outbuildings would cover more than half your original garden, planning permission is required.

Permission Required

Flat or maisonette

Permitted Development rights for extensions don’t apply to flats or maisonettes—only to houses. Planning permission always required.

Conservatory Size Limits Under Permitted Development

The depth you can build without planning permission depends on your house type and how you’re applying:

House Type	Standard PD Limit	Larger Home Extension*	Notes
Attached / Semi-detached	3m depth	Up to 6m depth	*Requires prior approval
Detached house	4m depth	Up to 8m depth	*Requires prior approval
Within 2m of boundary	3m eaves height max	Same restriction	Overall height still max 4m
Conservation Area	3m/4m (rear only)	Not available	No side extensions

*Larger Home Extension Scheme: This scheme has been extended to April 2028. It allows larger single-storey rear extensions (including conservatories) without full planning permission, but requires:

Prior approval application to your council (£120 fee)
Neighbour notification and consultation period
Council assessment of impact on neighbours
Written confirmation before you can proceed

Pro Tip: Measure From the Original Rear Wall

Depths are measured from the original rear wall—the rear wall as it existed on 1st July 1948, or when the house was first built if later. If your house has been extended before, you measure from where the original wall would have been, not from the current rear wall. Previous extensions count against your allowance.

Height Restrictions Explained

Height rules are often misunderstood. Here’s exactly how they work:

Situation	Maximum Eaves Height	Maximum Overall Height
Within 2m of any boundary	3m	3m (same as eaves)
More than 2m from boundaries	Height of existing house eaves	4m
Any location	Cannot exceed existing house eaves	Cannot exceed existing house eaves

The key point: your conservatory cannot be higher than the existing house eaves, even if that’s less than 4m. If your house has low eaves at 2.8m, that becomes your conservatory’s maximum height.

Building Regulations: Separate from Planning Permission

Building Regulations are completely separate from planning permission. You might not need planning permission but still need Building Regulations approval—or vice versa.

When Conservatories Are Exempt from Building Regulations

Your conservatory is typically exempt from Building Regulations if ALL these conditions are met:

Building Regulations Exemption Checklist:

Floor area under 30m²

Built at ground level

Thermally separated from house by external-quality walls, doors, or windows

Independent heating with separate controls (not connected to house central heating)

Glazing complies with safety requirements (toughened/laminated where required)

Electrical work carried out by certified electrician (Part P compliance)

Warning: Removing the Doors Changes Everything

If you remove the doors between your conservatory and house, the Building Regulations exemption no longer applies. The conservatory becomes part of the house and must comply with current Building Regulations for thermal performance (Part L), structural integrity, and more.

This is one of the most common compliance issues we encounter—and can be expensive to resolve retrospectively.

Special Cases: Listed Buildings and Conservation Areas

Listed Buildings

Listed Building Consent is ALWAYS required for any external works to a listed building—regardless of size. This includes conservatories of any dimensions. You’ll typically need both:

Listed Building Consent – assesses impact on historic character
Planning Permission – may also be required depending on the works

The good news: modern glazed structures are often viewed favourably by conservation officers because they’re clearly contemporary and don’t pretend to be historic. A well-designed frameless glass extension may have a better chance of approval than a traditional-style conservatory that tries to mimic period features.

Conservation Areas

Conservation Area status doesn’t automatically prevent you from building a conservatory. The key restrictions are:

No side extensions visible from a highway (so no side conservatories)
No external cladding (not usually relevant for conservatories)
Rear conservatories are generally permitted if they meet normal PD limits
Article 4 Directions may remove PD rights entirely in some Conservation Areas

Always Check for Article 4 Directions

Some Conservation Areas have Article 4 Directions that remove Permitted Development rights for certain types of development. This means you’d need planning permission even for works that would normally be permitted. Contact your local planning authority to check before assuming you don’t need permission.

Common Myths About Conservatory Planning Permission

Myth #1: “Conservatories under 30m² never need planning permission”

Fact: The 30m² figure relates to Building Regulations exemption, not planning permission. Planning rules focus on depth (3m/4m), height, and position—not floor area. A 20m² conservatory in the wrong position still needs permission, while a 35m² conservatory within PD limits might not.

Myth #2: “If it’s mostly glass, different rules apply”

Fact: For planning permission, conservatories and solid extensions are treated identically—same size limits apply. The glass percentage only matters for Building Regulations exemption. An all-glass conservatory follows the same planning rules as a brick extension.

Myth #3: “My neighbour built one, so I can too”

Fact: Every property is different. Your neighbour might have a detached house (4m limit vs your 3m), a larger garden (different 50% calculation), or may have actually obtained planning permission. Never assume your situation matches someone else’s.

Myth #4: “I can build right up to the boundary with no restrictions”

Fact: You can build up to the boundary, but if within 2m, the maximum eaves height drops to 3m. You may also need a Party Wall Agreement. The rules don’t prevent boundary building—they restrict height.

Myth #5: “Once the conservatory is built, nothing can happen”

Fact: Local authorities can take enforcement action within 4 years of completion for building without required permission. They can require demolition or retrospective applications. Non-compliance also causes problems when selling your property—conveyancing searches reveal missing permissions.

How to Get Certainty: Lawful Development Certificate

If you want legal proof that your conservatory doesn’t need planning permission, apply for a Lawful Development Certificate (LDC). This official document from your local planning authority confirms your development is lawful.

Benefits of an LDC

Legal protection: Shields you from enforcement action
Property sale: Valuable evidence for conveyancing—solicitors look for this
Peace of mind: Official confirmation before spending money
Mortgage/insurance: May be required by lenders or insurers

How to Apply

Download the application form from Planning Portal or your council
Provide scaled drawings of your proposed conservatory
Include a site plan showing position, boundaries, and measurements
Pay the fee (£258 for proposed development, 2026)
Wait up to 8 weeks for a decision

Pro Tip: Apply Before Building

Applying for an LDC before building (proposed development) costs £258. Applying after building (existing development) costs the same but gives you no protection if it’s refused—you may face enforcement action. Get certainty before you commit.

Step-by-Step: Checking Your Conservatory

Complete This Checklist Before Building:

Step 1: Check if property is listed, in Conservation Area, or subject to Article 4 Direction

Step 2: Identify your house type (attached or detached) to determine depth limit

Step 3: Measure proposed depth from the original rear wall (not current if extended)

Step 4: Check height (max 4m, or 3m eaves if within 2m of boundary)

Step 5: Calculate total garden coverage (all outbuildings must be under 50%)

Step 6: Confirm position is to the rear, not forward of principal elevation

Step 7: Check Building Regulations requirements (separate from planning)

Step 8: If in doubt, apply for a Lawful Development Certificate (£258)

Room Outside

Conservatory Specialists | Established 1973 | 50+ Years Experience

Room Outside designs and builds luxury conservatories, orangeries, and glass extensions across Kent, Surrey, Sussex, Hampshire, and London. We handle planning considerations, Building Regulations compliance, and create stunning spaces that meet all requirements. Call 01243 538999 for expert advice.

Areas We Cover

Room Outside designs and builds conservatories across the South East of England, with full knowledge of local planning requirements:

Kent Surrey East Sussex West Sussex Hampshire London Berkshire Essex

Sources, References, and Further Reading

Official Government Sources: Town and Country Planning (General Permitted Development) (England) Order 2015 (as amended); Planning Portal (planningportal.co.uk); Building Regulations 2010 (as amended).

Local Authority Resources: Consult your specific local planning authority for Conservation Area maps, Article 4 Directions, and local policies.

Industry Experience: Room Outside – 50+ years experience designing and building conservatories with full planning and Building Regulations compliance.

Last updated: March 2026 | Expert review: Planning requirements verified against current legislation

Frequently Asked Questions

Do I need planning permission for a conservatory?

Most conservatories don’t need planning permission under Permitted Development rights, provided they meet size limits: max 3m depth for attached houses (4m detached), max 4m height, under 50% garden coverage, and at the rear of the property.

What is the maximum size conservatory without planning permission?

Attached houses: 3m depth (or 4m under Larger Home Extension with prior approval). Detached houses: 4m depth (or 8m with prior approval). Maximum height is 4m, or matching existing eaves if lower. Total outbuildings must be under 50% of garden.

Do conservatories need Building Regulations?

Conservatories are often exempt if: under 30m² floor area, at ground level, thermally separated from the house by doors/windows, have independent heating controls, and glazing meets safety requirements. Remove the separating doors and you lose the exemption.

Can I build a conservatory on a listed building?

Listed Building Consent is ALWAYS required for any external works to a listed building, regardless of size. You’ll usually need planning permission too. Modern glass structures are often viewed favourably as they’re clearly contemporary.

What are the conservatory planning rules for 2026?

Rules remain largely unchanged: 3m depth for attached (4m detached), max 4m height, 50% garden coverage, single storey, rear position only. The Larger Home Extension scheme allowing 6m/8m with prior approval is extended to 2028.

Can I build a conservatory in a Conservation Area?

Yes, rear conservatories are generally permitted under standard PD limits. However, no side extensions are allowed, and some Conservation Areas have Article 4 Directions removing PD rights entirely. Always check with your local planning authority.

How close to the boundary can I build a conservatory?

You can build right up to the boundary, but if within 2m of any boundary, maximum eaves height is restricted to 3m. You may need a Party Wall Agreement if building on or near a shared boundary.

What’s the difference between conservatory and extension for planning?

For planning permission, they’re treated identically—same size limits apply. The difference matters for Building Regulations: conservatories can be exempt if thermally separated with sufficient glazing, while solid extensions cannot.

What is the Larger Home Extension scheme?

A scheme allowing larger single-storey rear extensions (up to 6m attached, 8m detached) without full planning permission. Requires prior approval application (£120), neighbour notification, and council assessment. Extended to April 2028.

What happens if I build without permission?

The local authority can take enforcement action within 4 years, potentially requiring demolition or retrospective applications. Non-compliance causes problems when selling—conveyancing searches reveal missing permissions and can delay or prevent sales.

Call us anytime – David, our digital assistant, will take a few details so the right specialist can follow up personally. 01243 538999 or request a consultation online

Ready to Discuss Your Conservatory Project?

Our specialists understand planning requirements and Building Regulations inside out. We’ll help you design a conservatory that meets all requirements and exceeds your expectations.

Book Free Consultation

Call us anytime on 01243 538999 – David, our digital assistant, will take a few details so the right specialist can follow up personally.

Room Outside: Conservatory specialists since 1973.
Serving Kent, Surrey, Sussex, Hampshire, London & surrounding areas.

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Resources

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Aluminium vs Timber vs uPVC: Choosing the Right Frame in 2026

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Conservatory vs Orangery vs Glass Box: Buyer’s Framework

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Site Surveys Explained: What Happens Before a Single Pane of Glass Is Ordered

roomoutsideuk

03rd March, 2026

Garden Room Planning Permission: The Complete Guide for South East Homeowners

Planning Guide 2026

Garden Room Planning Permission: The Complete Guide for South East Homeowners

Do you need planning permission for a garden room? Everything UK homeowners need to know about Permitted Development, size limits, Building Regulations, and when you definitely need to apply.

18 min read

Updated February 2026

South East UK Focus

Quick Answer: Do You Need Planning Permission?

Most garden rooms do NOT need planning permission under Permitted Development rights. Your garden room is likely exempt if it’s: single storey, max 2.5m height within 2m of a boundary, covers less than 50% of your garden (including other outbuildings), not forward of the house front, and used for purposes incidental to the house (office, gym, studio—not self-contained accommodation).

You WILL need planning permission if: your home is a listed building, you’re in a Conservation Area/AONB, your Permitted Development rights have been removed, or the garden room will be self-contained living accommodation.

Key Facts: Garden Room Planning Permission (UK 2026)

Maximum height near boundary: 2.5m if within 2 metres of any boundary
Maximum height elsewhere: 4m (dual-pitched roof) or 3m (other roof types) if more than 2m from boundary
Garden coverage limit: Total outbuildings must not exceed 50% of garden area
Building Regs threshold: Generally exempt if under 15m² (or under 30m² if more than 1m from boundary)
Conservation Areas: Garden buildings limited to 10m² and cannot be between house and highway
Lawful Development Certificate: £103 fee (as of 2026) provides legal confirmation no planning needed
Electrical work: Must comply with Part P Building Regulations regardless of size
Use restriction: Must be “incidental to the dwelling”—not self-contained accommodation

2.5m

Max height near boundary

50%

Max garden coverage

15m²

Building Regs exempt

£103

LDC application fee

What is Permitted Development?

Permitted Development (PD) is a national grant of planning permission that allows certain building works and changes of use without needing to submit a planning application. For garden rooms, Permitted Development rights mean you can build an outbuilding in your garden without applying for planning permission—provided you meet specific criteria.

These rights are set out in the Town and Country Planning (General Permitted Development) (England) Order 2015 (as amended), specifically Schedule 2, Part 1, Class E for outbuildings. Scotland, Wales, and Northern Ireland have similar but slightly different rules.

Definition: “Incidental to the Enjoyment of the Dwelling”

This legal phrase is crucial for garden rooms. It means the garden building must serve the main house—not be a separate dwelling or primary business premises. Acceptable uses include:

Home office (for your own work, not employing staff on site)
Gym or yoga studio
Art studio or hobby room
Games room or home cinema
Guest bedroom (without separate kitchen/bathroom forming self-contained unit)
Workshop or storage

NOT acceptable: Self-contained granny annexe, separate rental unit, commercial premises with employees/customers visiting regularly.

Garden Room Size Limits Under Permitted Development

Contrary to popular belief, there’s no specific floor area limit for garden rooms under Permitted Development. The restrictions focus on height and total garden coverage.

Height Restrictions

Location	Roof Type	Maximum Height
Within 2m of any boundary	Any	2.5m at eaves
More than 2m from boundary	Dual-pitched (apex)	4m at ridge
More than 2m from boundary	Other (flat, mono-pitch)	3m at highest point

The 50% Rule

Total area of ground covered by outbuildings (including your proposed garden room) must not exceed 50% of the total area of the curtilage (garden). This includes:

Sheds
Garages (if detached)
Greenhouses
Swimming pools and pool houses
Other outbuildings
Extensions to the house (for calculation purposes)

The “original” garden area is calculated based on what existed on 1st July 1948, or when the house was built if later. Previous extensions don’t count against your garden area, but they do count as built structures for the 50% calculation.

Common Mistake: Measuring Only the Garden Room

Many homeowners measure only their proposed garden room and think “that’s well under 50%.” But you must include ALL outbuildings. If you have a 100m² garden with an existing 15m² shed and 10m² greenhouse, you’ve already used 25m². Your garden room cannot exceed 25m² without breaching the 50% rule—even though 25m² seems small for a 100m² garden.

When You DO Need Planning Permission

Even if your garden room meets the size criteria, you’ll still need planning permission in certain circumstances:

Planning Permission IS Required If:

Listed building: Any external works to a listed building require Listed Building Consent AND often planning permission

Conservation Area: Additional restrictions apply—garden buildings over 10m² or positioned between house and highway need permission

AONB, National Park, or World Heritage Site: Same restrictions as Conservation Areas

Article 4 Direction: Your local authority may have removed Permitted Development rights for your area

Self-contained accommodation: Garden room with kitchen and bathroom facilities for independent living

Forward of principal elevation: Garden room in front of the house facing a highway

Exceeds height limits: Over 2.5m within 2m of boundary, or over 4m elsewhere

Exceeds 50% coverage: Total outbuildings exceed half your garden area

Building Regulations: Separate from Planning Permission

Building Regulations are entirely separate from planning permission. You might not need planning permission but still need Building Regulations approval—or vice versa. Building Regulations cover structural safety, fire safety, ventilation, drainage, and electrical safety.

When Building Regulations Apply to Garden Rooms

Garden Room Size	Sleeping Accommodation?	Distance from Boundary	Building Regs Required?
Under 15m²	No	Any	No
15-30m²	No	More than 1m	No
15-30m²	No	Less than 1m	Yes
Over 30m²	No	Any	Yes
Any size	Yes	Any	Yes

Electrical Work Always Needs Compliance

Regardless of size, electrical installations in garden rooms must comply with Part P of the Building Regulations. This doesn’t mean you need Building Regulations approval for the whole building—but the electrical work must be:

Carried out by a competent person registered with NICEIC, NAPIT, or similar scheme, OR
Inspected and tested by Building Control, who will issue a certificate

A qualified electrician registered with a competent person scheme will self-certify the work and notify Building Control on your behalf.

Regional Considerations: South East England

The South East has particular planning considerations due to the high number of Conservation Areas, AONBs, and listed buildings. Here’s what to watch for in different areas:

Kent

High Weald AONB: Covers significant parts of Kent—garden buildings limited to 10m² under PD
Conservation Areas: Canterbury, Tunbridge Wells, Sevenoaks all have extensive Conservation Areas
Kent Downs AONB: Strict oversight on building design and materials

Surrey

Surrey Hills AONB: Covers approximately 25% of the county
Green Belt: Extensive Green Belt restrictions—garden rooms generally permitted but size matters
Conservation Areas: Guildford, Reigate, Farnham have substantial protected areas

Sussex (East and West)

South Downs National Park: Similar restrictions to AONB—garden buildings limited
High Weald AONB: Extends into Sussex
Coastal areas: Chichester Harbour AONB has additional considerations
Conservation Areas: Brighton, Lewes, Chichester have protected zones

Hampshire

New Forest National Park: Very strict planning controls
South Downs National Park: Covers eastern Hampshire
Conservation Areas: Winchester, Southampton, Portsmouth have protected areas

How to Check Your Local Designations

Visit your local council’s planning portal
Use the government’s MAGIC Map to check AONB/National Park boundaries
Search “[your council] Conservation Areas map”
Check your property’s title deeds for restrictive covenants
Contact your local planning department if uncertain

How to Get Certainty: Lawful Development Certificate

If you want legal certainty that your garden room doesn’t need planning permission, apply for a Lawful Development Certificate (LDC). This is an official document from your local planning authority confirming that the proposed development is lawful.

Benefits of an LDC

Legal protection: Protects you from enforcement action
Property sale: Valuable evidence when selling—solicitors check for this
Peace of mind: Official confirmation before you spend money building
Relatively cheap: Currently £103 for proposed development (2026)

How to Apply

Download the application form from the Planning Portal or your local council
Provide scaled drawings of your proposed garden room
Include a site plan showing position in garden
Pay the fee (£103 for proposed development)
Wait 8 weeks for a decision (statutory timeframe)

Pro Tip: Apply BEFORE Building

If you apply for an LDC after building (certificate of lawfulness of existing development), the fee is higher (£206) and you have no protection if it’s refused—you may face enforcement action. Apply before building for the “proposed” certificate, which is cheaper and gives you certainty before committing.

Common Myths About Garden Room Planning Permission

Myth #1: “Garden rooms under 15m² never need permission”

Fact: The 15m² figure relates to Building Regulations exemption, NOT planning permission. Planning permission depends on height, location, garden coverage, and property designation—not floor area. A 10m² garden room could need permission if it exceeds height limits or is in a Conservation Area.

Myth #2: “It’s in my garden so I can build what I want”

Fact: Permitted Development rights have strict conditions. Exceed them, and you need planning permission. Build without it, and you risk enforcement notices requiring demolition. Your garden is still subject to planning law.

Myth #3: “If my neighbour built one, so can I”

Fact: Every property is different. Your neighbour might have a larger garden (different 50% calculation), be outside a Conservation Area, have different boundary setbacks, or have actually obtained planning permission. Never assume your situation matches theirs.

Myth #4: “Planning permission is expensive and takes forever”

Fact: A householder planning application costs £258 (2026) and has an 8-week statutory decision period. Many straightforward applications are approved without issues. It’s not as daunting as people assume—and it’s far cheaper than demolishing an illegal building.

Myth #5: “I can call it a shed to avoid planning rules”

Fact: What you call it doesn’t matter—how you use it does. A “shed” used as a home office is subject to the same rules as a “garden office.” Planning rules apply based on the structure and its use, not its name.

Step-by-Step: Checking if Your Garden Room Needs Permission

Complete This Checklist Before Building:

Step 1: Check if property is listed, in Conservation Area, AONB, or National Park

Step 2: Check for Article 4 Directions removing PD rights in your area

Step 3: Measure total garden area and all existing outbuildings

Step 4: Calculate if proposal keeps total outbuildings under 50%

Step 5: Check height complies (2.5m within 2m of boundary; 4m/3m elsewhere)

Step 6: Confirm position is NOT forward of principal elevation

Step 7: Confirm use is incidental (office, gym)—NOT self-contained living

Step 8: If ANY doubt, apply for Lawful Development Certificate (£103)

Room Outside

Garden Room Specialists | Established 1973 | 50+ Years Experience

Room Outside designs and builds quality garden rooms, conservatories, and orangeries across Kent, Surrey, Sussex, Hampshire, and London. We handle planning considerations, Building Regulations compliance, and create stunning spaces that meet all legal requirements. Call 01243 538999 for expert advice on your garden room project.

Areas We Cover

Room Outside designs and builds garden rooms across the South East of England, with full knowledge of local planning requirements:

Kent Surrey East Sussex West Sussex Hampshire London Berkshire Essex

Sources, References, and Further Reading

Official Government Sources: Town and Country Planning (General Permitted Development) (England) Order 2015; Planning Portal (planningportal.co.uk) – Outbuildings guidance; Building Regulations 2010 (as amended) – Schedule 2.

Local Authority Resources: Consult your specific local planning authority for Conservation Area maps, Article 4 Directions, and local planning policies.

Industry Experience: Room Outside – 50+ years experience designing and building garden rooms across South East England with full consideration of planning requirements.

Last updated: February 2026 | Expert review: Planning requirements verified against current legislation

Frequently Asked Questions

Do you need planning permission for a garden room?

Most garden rooms don’t need planning permission under Permitted Development rights, provided they meet criteria: max 2.5m height within 2m of boundary, total outbuildings under 50% of garden, single storey, not forward of the house, and used for purposes incidental to the dwelling.

What is the maximum size for a garden room without planning permission?

There’s no specific floor area limit. The key restrictions are: 2.5m max height within 2m of boundary (4m elsewhere with dual-pitched roof), and total outbuildings must not exceed 50% of your garden area. You could build a large garden room if it meets these criteria.

Do garden rooms need Building Regulations approval?

Garden rooms under 15m² (or under 30m² if more than 1m from boundary) are generally exempt from Building Regulations, provided they don’t contain sleeping accommodation. Electrical work must still comply with Part P regardless of size.

Can I build a garden room in a Conservation Area?

Yes, but with additional restrictions. Garden buildings in Conservation Areas are limited to 10m² under Permitted Development and cannot be positioned between the house and the highway. Larger structures will need planning permission.

Can I use a garden room as a home office?

Yes, using a garden room as a home office is permitted and doesn’t usually require planning permission, as it’s “incidental to the enjoyment of the dwelling.” However, if you employ staff on site or have regular customer visits, this may change the situation.

Can I sleep in my garden room?

Occasional guest sleeping is generally fine. However, if the garden room becomes self-contained living accommodation with its own kitchen and bathroom, it’s no longer “incidental” and will require planning permission. Building Regulations also apply differently to sleeping accommodation.

What happens if I build without planning permission?

The local authority can issue an enforcement notice requiring demolition or retrospective application. When selling, lack of proper permissions will be revealed in searches and can delay or prevent sales. Always verify requirements before building.

How close to the boundary can I build a garden room?

You can build right up to the boundary, but if within 2m of any boundary, maximum height is restricted to 2.5m. For Building Regulations exemption, garden rooms between 15-30m² must be more than 1m from any boundary.

Do I need planning permission for a garden room with electricity?

No, having electricity doesn’t affect planning requirements. However, electrical work must comply with Part P of Building Regulations and should be carried out by a qualified electrician registered with a competent person scheme (NICEIC, NAPIT, etc.).

How do I check if my garden room needs planning permission?

Check all Permitted Development criteria, verify your property isn’t listed or in a designated area (Conservation Area, AONB), check for Article 4 Directions, and confirm your use is incidental. If in doubt, apply for a Lawful Development Certificate (£103) for legal certainty.

Call us anytime – David, our digital assistant, will take a few details so the right specialist can follow up personally. 01243 538999 or request a consultation online

Ready to Discuss Your Garden Room Project?

Our specialists understand local planning requirements across Kent, Surrey, Sussex, Hampshire, and London. We’ll help you design a garden room that meets all regulations and exceeds your expectations.

Book Free Consultation

Call us anytime on 01243 538999 – David, our digital assistant, will take a few details so the right specialist can follow up personally.

Room Outside: Garden room specialists since 1973.
Serving Kent, Surrey, Sussex, Hampshire, London & surrounding areas.

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Resources

Advice & Inspiration

Conservatories

Aluminium vs Timber vs uPVC: Choosing the Right Frame in 2026

Conservatories

Conservatory vs Orangery vs Glass Box: Buyer’s Framework

Modern glass extension showcasing a stylish interior, surrounded by lush garden landscaping, emphasizing home value enhancement and design advice from Room Outside.

Home Improvement Advice

Garden Room Cost UK 2026: £35k+

roomoutsideuk

18th February, 2026

Is a Conservatory, Orangery or Frameless Glass Box Extension a Viable Home Office Option?

Home Office Guide 2026

Conservatory, Orangery or Frameless Glass Box: The Ultimate Home Office?

Light‑filled, productive workspaces that blend with your home. Compare designs, furniture, glare control, power, and planning for your perfect home office extension.

📖 18 min read

✅ Updated February 2026

🏡 UK Specialist Guide

💡 Quick answer: can a glass extension be a home office?

Yes. Conservatories, orangeries and frameless glass boxes provide inspiring, light‑filled home offices that boost wellbeing and focus. With modern solar‑control glass, integrated blinds, and smart cable planning, they’re comfortable year‑round. The best choice depends on your work style: conservatory = maximum daylight & garden views; orangery = solid walls for shelving & privacy; glass box = statement space for creatives. All add real value to your home.

+38%

productivity in natural light*

86%

solar heat blocked

8-12

weeks build time

5-8%

added property value

* Source: University of Exeter, 2024

The way we work has transformed. Hybrid and home‑based work are now the norm for millions. But a makeshift desk in the corner of a bedroom rarely inspires. A dedicated, beautiful workspace—one that connects you to the garden and floods with daylight—can transform your productivity and work‑life balance.

In this guide, we examine three popular glazed extension styles as home offices: conservatory, orangery, and frameless glass box. We’ll look at furniture integration, glare control, power/IT, privacy, and planning, so you can choose the perfect space for your profession.

1. The Conservatory Home Office

A conservatory is the classic glazed extension—maximum glass, maximum light. For a home office, this means you’re surrounded by the garden, which reduces stress and sparks creativity.

What to consider

Furniture & storage: Conservatories often have dwarf walls or full-height glazing, so tall bookcases may only fit against the house wall. Plan low‑level storage or floating shelves.
Glare & screens: Direct sun can cause screen glare. Opt for solar‑control glass and discreet integrated blinds (roof and vertical).
Ventilation: Openable roof vents and French doors allow airflow—essential for warm afternoons.
Heating: Underfloor heating works beautifully, keeping the space warm without radiators spoiling the aesthetic.

💼 Best for:

Writers, designers, gardeners, or anyone who thrives with abundant daylight and a direct connection to nature. Also great as a dual‑use space (office by day, relaxation by evening).

2. Frameless Glass Box Office — The WOW factor

A frameless glass box is the ultimate contemporary workspace. Floor‑to‑ceiling, edge‑to‑edge glass creates an almost invisible boundary—you feel like you’re working outside, yet fully sheltered. Perfect for creatives, architects, or anyone wanting a signature home office.

Design & practical must‑haves

Furniture minimalism: With full glazing, bulky furniture detracts. Choose sleek, low‑profile pieces (cantilevered desks, transparent chairs).
Light control: Because all surfaces are glass, glare can be intense. Specify automated external blinds or internal pleated blinds integrated into the glazing cavity.
Power & data: No wall space means floor boxes are essential. Plan positions for desk, printer, and monitor cables early.
Privacy: If overlooked, consider switchable smart glass (opaque at the flick of a switch) or external screening with planting.

⚠️ Glare note

Direct low‑angle sun can be intense. Solar control glass (g-value ≤0.35) and automated blinds are strongly recommended. Many glass box offices use a combination of roof overhangs and exterior louvres.

🎨 Best for:

Artists, photographers, tech entrepreneurs, or anyone wanting a stunning, minimalist workspace that impresses clients (on video calls too!).

3. Orangery Office — Structure & Separation

An orangery combines solid lower walls (often brick or rendered) with a central glazed lantern and large windows. This gives you practical wall space for shelving, filing cabinets, or pinboards, while still flooding the room with light from above.

Advantages for home working

Privacy and enclosure: The solid walls make the space feel more like a ‘real room’—psychologically separate from the house and garden.
Flexible furniture layout: You can place desks against walls without blocking views.
Integrated tech: Power sockets, data points, and even wall‑mounted monitors are easy to install.
Stand‑alone garden office version: If built separately, it becomes a true retreat—no household distractions.

An orangery can also be attached to the house with French doors, or built as a detached garden room. Both make superb, focused work environments.

📋 Best for:

Accountants, counsellors (privacy), writers needing silence, or anyone who wants a clear boundary between work and home life.

At a glance: which office style suits you?

Feature	Conservatory	Orangery	Glass Box
Natural light	★★★★★ (all‑glass)	★★★★☆ (lantern + windows)	★★★★★ (full glass)
Wall space for storage	★☆☆☆☆ (limited)	★★★★☆ (solid lower walls)	☆☆☆☆☆ (none)
Glare potential	Medium (manageable)	Low	High (needs blinds)
Furniture style	Adaptable, low cabinets	Traditional or modern	Minimalist/designer
Privacy from neighbours	Low (fully glazed)	High (solid walls)	Very low (can be treated)
Typical cost (20m²)	£28k – £50k	£45k – £85k	£55k – £110k+

Designing your perfect glass office

1. Power, data & WiFi

Nothing ruins a minimalist office like trailing cables. Floor boxes (circular flush units) are ideal for desks away from walls. For wall‑mounted desks, discreet skirting trunking works. Also consider a WiFi extender or mesh node—glass can affect signal, so plan placement or run Ethernet.

2. Heating & cooling (year‑round comfort)

Underfloor heating is the most popular choice—invisible and comfortable. For cooling, many extensions can incorporate air conditioning or simply rely on solar‑control glass and automated venting. Blinds (integrated roof blinds or external shades) are essential for summer.

3. Glazing technology

Modern glass is not like your parents’ conservatory. Specify:

Solar control coating – blocks up to 86% infrared heat
Low‑E coatings – retain heat in winter
Acoustic laminate – if near a road
Self‑cleaning – reduces maintenance

Planning permission for a home office extension

Most attached home office extensions fall under Permitted Development if:

Single storey, rear extension ≤4m (detached) or ≤3m (semi/terraced)
Maximum height ≤4m, eaves ≤3m
Materials similar to existing house

However, if you plan a detached garden office (e.g., an orangery in the garden), it’s classed as an outbuilding. Permitted Development allows outbuildings up to 2.5m eaves, 4m ridge, not covering more than 50% of the garden. Listed buildings, Conservation Areas, AONBs always require permission. See our full planning guide for details.

💰 Added property value

A well‑designed home office extension typically adds 5–8% to a property’s value. If it’s a high‑quality, insulated space with broadband, it’s a major selling point for future buyers.

Room Outside

Established 1973 | Glass extension specialists

We’ve designed hundreds of home offices—from quiet garden writing rooms to frameless glass boardrooms. Our team helps you balance light, comfort, and practicality. Call 01243 538999 for advice.

West Sussex East Sussex Surrey Hampshire Kent Essex London Berkshire

Frequently Asked Questions

Is a conservatory too hot or cold for a home office?

Not with modern solar‑control glass and underfloor heating. You can maintain a stable 18‑24°C all year. Roof vents and blinds manage summer sun.

Can I get WiFi in a glass box extension?

Yes, but you may need a mesh system or Ethernet cable run in the floor. Glass can weaken signals; plan data points during build.

How much does a home office extension cost?

£25,000–£120,000+ depending on size and style. A medium conservatory office ~£40k, glass box ~£70k. See table above.

Do I need building regulations?

Yes, all new habitable spaces need Building Regs approval (Part L insulation, Part F ventilation, Part P electrics). Your installer usually manages this.

What flooring is best for a glass office?

Porcelain tiles, polished concrete, or luxury vinyl—they work with underfloor heating and don’t fade. Avoid carpet near full glazing (sun fade).

Can I use a garden office for client meetings?

Absolutely. An orangery or glass box makes a professional meeting space. Consider acoustic glazing if near traffic.

Call us anytime on 01243 538999 – David our digital assistant will take a few details so the right specialist can follow up personally.

Design your perfect home office

Book a free design consultation (virtual or on‑site). We’ll help you choose the ideal style, discuss solar control, furniture integration, and provide a fixed quotation.

Book free consultation →

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Resources

Advice & Inspiration

Conservatories

Aluminium vs Timber vs uPVC: Choosing the Right Frame in 2026

Conservatories

Conservatory vs Orangery vs Glass Box: Buyer’s Framework

Design & Planning

Site Surveys Explained: What Happens Before a Single Pane of Glass Is Ordered

roomoutsideuk

09th February, 2026

Oak Framed Conservatories: A Basic Guide

Complete Guide 2026

Oak Framed Conservatories, Orangeries & Garden Rooms

Everything you need to know about oak frame extensions: costs, planning permission, maintenance, lifespan, and design options. Expert guidance from specialists with 50+ years experience.

20 min read

Updated February 2026

UK Specialist Guide

Quick Answer: Oak Framed Extensions

Oak framed conservatories, orangeries, and garden rooms are premium glass extensions using traditional oak beam construction. They cost from £30,000 for small structures to £100,000+ for large orangeries. Oak frames are exceptionally durable, with a lifespan of 100+ years when properly maintained. Many projects fall under Permitted Development, though listed buildings require additional consent. Oak is particularly suited to period properties and is favoured by conservation officers.

Key facts: Green oak costs ~30% less than air-dried oak. Maintenance involves sealing every 3-5 years. Build time is typically 4-7 months. Oak naturally weathers to silver-grey if left untreated. Proper foundations are essential as green oak weighs approximately 1,000 kg per cubic metre.

Key Facts: Oak Framed Extensions (UK 2026)

Cost range: £30,000 (small conservatory) to £100,000+ (large orangery)
Lifespan: 100+ years with proper maintenance; many medieval oak buildings still stand after 500+ years
Green oak vs air-dried: Green oak is 30% cheaper but shrinks as it seasons over 2-5 years
Weight: Green oak weighs approximately 1,000 kg per cubic metre
Maintenance: Seal/oil every 3-5 years to maintain colour; annual inspection of joints
Planning: Many fall under Permitted Development; listed buildings need Listed Building Consent
Build time: 16-30 weeks (4-7 months) from design to completion
Property value: Quality oak extensions can add 5-10% to property value

£30k+

Starting price

100+

Years lifespan

4-7

Months build time

5-10%

Value added

Oak-framed building with a sloped roof, multiple windows, and wooden garage doors, surrounded by greenery, representing traditional construction techniques for modern extensions.

What is an Oak Framed Conservatory?

An oak framed conservatory is a glazed home extension built using traditional oak beam construction. The structural frame is made from solid oak timbers, typically joined using traditional carpentry techniques such as mortise and tenon joints secured with oak pegs. Large glass panels fill the spaces between the oak frame, creating a bright, light-filled living space.

Oak has been used in British construction for over a thousand years. Many medieval buildings, including churches, barns, and manor houses, feature oak frames that remain structurally sound after 500+ years. This exceptional durability, combined with oak’s natural beauty and warmth, makes it an ideal material for modern home extensions.

Glazed oak frame home extension featuring traditional carpentry, large glass panels, and a bright outdoor setting with landscaped garden.

What Makes Oak Special as a Building Material?

Oak possesses unique properties that make it exceptional for construction:

Natural durability: Oak’s high tannin content makes it naturally resistant to decay, insects, and fungal attack
Exceptional strength: Oak has a high strength-to-weight ratio, allowing large spans without intermediate supports
Aesthetic appeal: The warm, rich tones and distinctive grain pattern create visual character
Sustainability: Oak is a renewable resource; British and European oak forests are sustainably managed
Versatility: Suits both traditional period properties and contemporary architectural designs
Heritage value: Traditional construction methods connect modern buildings to centuries of craftsmanship

Definition: Green Oak vs Air-Dried Oak

Green oak is freshly cut timber with moisture content of 40-60%. It’s easier to work (can be cut and shaped with hand tools), costs approximately 30% less than air-dried oak, and is readily available in large sections. However, green oak shrinks and develops characteristic surface cracks (called “shakes”) as it dries over 2-5 years. Oak frame buildings are specifically designed to accommodate this natural movement.

Air-dried oak has been seasoned for 1-2+ years, reducing moisture content to 18-25%. It’s more dimensionally stable with less movement after installation, but costs more and is harder to source in large sections. Air-dried oak is typically used where minimal movement is critical.

Oak Conservatory vs Orangery vs Garden Room: What’s the Difference?

While all three use oak frame construction, they differ significantly in design, glazing ratio, and character:

Feature	Oak Conservatory	Oak Orangery	Oak Garden Room
Glazing ratio	75-90% glass	40-60% glass	20-40% glass
Roof type	Fully glazed	Flat roof with glass lantern	Solid roof with rooflights
Wall construction	Full-height glass	Solid lower walls, glass above	Predominantly solid walls
Natural light	Maximum	High	Moderate
Thermal efficiency	Good (with quality glass)	Excellent	Excellent
Typical cost	£30,000-£70,000	£50,000-£120,000	£25,000-£60,000
Best for	Light-filled living spaces	Kitchen-diners, formal rooms	Home offices, studios, gyms

Oak-framed garden room with wooden structure, sloped roof, and glass doors, set in a green landscape, showcasing design elements relevant to outdoor living spaces.

Oak Framed Conservatory

An oak framed conservatory maximises glazing, typically featuring full-height glass walls and a fully glazed roof. The oak frame provides the structural skeleton, with glass panels filling virtually all the space between timbers. This design delivers maximum natural light and strong visual connection with the garden.

Oak Orangery

An oak orangery has more solid construction, with brick, stone, or rendered lower walls supporting the oak frame. The roof is typically flat or low-pitched with a central glass lantern providing overhead light. This design offers a more substantial, architectural feel while still delivering excellent natural light.

Oak Garden Room

An oak garden room is more enclosed, featuring predominantly solid walls with windows rather than full glazing. The roof is typically solid with strategically placed rooflights. This design provides more privacy, better thermal efficiency, and a more building-like character. Garden rooms can be attached to the house or freestanding in the garden.

How Much Does an Oak Framed Conservatory Cost?

Oak is a premium material requiring skilled craftsmanship, so oak framed extensions command higher prices than uPVC or standard aluminium alternatives. However, the exceptional longevity (100+ years), aesthetic appeal, and property value enhancement often justify the investment.

Project Type	Size Range	Typical Cost Range
Small oak conservatory	12-18 m²	£30,000-£45,000
Medium oak conservatory	18-30 m²	£45,000-£70,000
Large oak conservatory	30-50 m²	£70,000-£100,000
Oak orangery	20-40 m²	£50,000-£120,000
Oak garden room (detached)	15-30 m²	£25,000-£60,000
Complex/bespoke projects	Variable	£100,000-£200,000+

Factors Affecting Oak Frame Costs

Size: Larger structures require more oak and more complex engineering
Complexity: Curved members, multiple roof levels, and intricate designs increase costs
Oak type: Air-dried oak costs approximately 30% more than green oak
Glazing specification: High-performance, heat-control glass adds to the cost but improves comfort
Foundation requirements: Ground conditions affect foundation costs significantly
Internal finishes: Flooring, electrics, heating, and decoration add to the overall budget
Location: Access difficulties and regional labour costs vary

For detailed pricing information, see our Oak Building Prices UK 2026 guide.

Do You Need Planning Permission for an Oak Conservatory?

Planning requirements for oak framed extensions depend on several factors. Many projects fall under Permitted Development rights and don’t require a planning application, while others need full planning permission.

When Permitted Development Usually Applies

Your oak extension likely falls under Permitted Development if it:

Doesn’t extend beyond the rear wall by more than 3m (semi-detached/terraced) or 4m (detached)
Is single storey with maximum eaves height of 3m
Doesn’t cover more than half the garden area
Is built from similar materials to the existing house
Isn’t forward of the principal elevation facing a highway

When Planning Permission IS Required

          You WILL Need Planning Permission If:
          Your property is a listed building (you’ll also need Listed Building Consent)
You’re in a Conservation Area, National Park, AONB, or World Heritage Site
Previous extensions have used your Permitted Development allowance
The extension exceeds Permitted Development size limits
Your property has Article 4 Direction restrictions
You’re building a detached garden room in some circumstances

        

Oak framework detail showcasing traditional joinery techniques, relevant to listed building extensions and conservation guidelines.

Oak Extensions on Listed Buildings

Oak is often the preferred material for extending listed buildings. Conservation officers generally favour oak because:

It’s a traditional material with historical precedent
Traditional joinery techniques (mortise and tenon, oak pegging) are authentic
The natural material complements period properties
Large glass panels allow the original building to remain visible

However, you’ll need both Listed Building Consent and planning permission. The design must be sympathetic to the historic building. Working with specialists experienced in listed building projects is essential.

How Long Does an Oak Frame Last?

Oak framed buildings are exceptionally durable. With proper design and maintenance, an oak framed conservatory can last 100+ years—far exceeding the lifespan of uPVC (20-25 years) or standard timber (30-40 years).

Historical Evidence of Oak’s Longevity

The UK has thousands of oak framed buildings that have survived for centuries. Medieval tithe barns, manor houses, and churches from the 13th-15th centuries remain structurally sound after 500-700 years. The Barley Barn at Cressing Temple in Essex dates from approximately 1220 and its original oak frame remains intact.

This longevity results from oak’s natural properties: high tannin content resists decay, dense grain resists insect attack, and the material actually hardens with age as it fully seasons.

Keys to Oak Frame Longevity

Keep oak off the ground: Raise the frame on a plinth or dwarf wall to prevent moisture absorption
Ensure good drainage: Water should drain away from the structure, never pooling against oak
Allow air circulation: Good ventilation prevents moisture build-up
Regular maintenance: Annual inspection and treatment every 3-5 years
Quality construction: Properly designed joints that accommodate natural oak movement

Oak Frame Maintenance Requirements

One of oak’s advantages is relatively low maintenance compared to softwood or painted finishes. Oak doesn’t require preservative treatment—it’s naturally durable. However, some maintenance is needed to preserve appearance and maximise lifespan.

Annual Maintenance Tasks

Visual inspection: Check joints, fixings, and glass seals for any issues
Clear gutters and drainage: Ensure water drains away from the oak frame
Check ventilation: Ensure air can circulate around the base of the frame
Clean glazing: Regular cleaning maintains appearance and light transmission

Periodic Maintenance (Every 3-5 Years)

Re-oil or seal the oak: This is optional but maintains the original colour
Check and replace sealants: Glass and roofing sealants may need renewal
Inspect for decay: Pay attention to areas where water might collect

To Treat or Not to Treat?

Untreated oak naturally weathers to an attractive silver-grey colour over several years. This is not decay—it’s a surface oxidation that actually protects the wood beneath. Many oak buildings are left untreated and weather beautifully for centuries.

Treated oak (with oil, UV-protective finish, or sealant) maintains the original honey-brown colour but requires reapplication every 3-5 years. Neither approach is “correct”—it’s a matter of aesthetic preference.

Common Misconceptions About Oak Frame Buildings

Myth #1: “Oak frames are too expensive”

Fact: While initial costs are higher than uPVC, the total cost of ownership over 50+ years is often lower. An oak frame lasting 100+ years compared to uPVC lasting 20-25 years means avoiding multiple replacements. Factor in the property value premium oak commands, and the economics often favour oak.

Myth #2: “Green oak will crack and split unacceptably”

Fact: Green oak does develop surface checks and shakes as it dries—this is normal and expected. These cracks are surface-deep and don’t affect structural integrity. Oak frame buildings are specifically designed to accommodate this movement. The characteristic checking is often considered part of oak’s charm and authenticity.

Myth #3: “Oak frames require constant maintenance”

Fact: Oak requires less maintenance than most alternatives. Unlike softwood, it doesn’t need preservative treatment. Unlike painted surfaces, there’s no flaking or repainting. If you’re happy with natural weathering, maintenance is minimal—just annual inspection and keeping drainage clear.

Myth #4: “Oak conservatories are cold in winter”

Fact: Temperature depends on glazing specification, not frame material. Modern high-performance glass achieves excellent U-values (under 1.0 W/m²K), ensuring year-round comfort. With proper glazing and heating, an oak conservatory is as thermally efficient as any other extension.

Myth #5: “Planning permission is always difficult for oak buildings”

Fact: Oak is often favoured by planners and conservation officers. For listed buildings, oak is frequently the preferred material. Many oak extensions fall under Permitted Development and don’t require planning permission at all.

The Oak Frame Building Process

Building an oak framed conservatory, orangery, or garden room typically takes 4-7 months from design to completion. Here’s how the process works:

Stage 1: Initial Consultation (Week 1-2)

Discuss your requirements, budget, and site constraints. Consider how you’ll use the space, glazing preferences, and integration with your existing property. A site survey assesses ground conditions, access, and any planning considerations.

Stage 2: Design Development (Weeks 3-8)

Detailed designs are developed including oak frame layout, glazing specifications, foundation requirements, and internal finishes. You’ll receive 3D visualisations and detailed quotations.

Stage 3: Planning and Approvals (Weeks 6-14)

If required, planning applications are submitted. Building Regulations approval is obtained. For listed buildings, Listed Building Consent is sought.

Stage 4: Oak Frame Manufacture (Weeks 10-18)

The oak frame is crafted off-site by specialist carpenters. Each joint is carefully cut and test-assembled before delivery. This typically takes 6-10 weeks depending on complexity.

Stage 5: Site Preparation (Weeks 14-18)

Foundations are excavated and poured. Any modifications to the existing property (removing windows, installing steel beams) are completed. The base is prepared for the oak frame.

Stage 6: Frame Erection (Weeks 18-20)

The pre-fabricated oak frame is delivered and erected on site. This is often completed in 1-2 weeks—the frame is assembled like a large-scale piece of joinery.

Stage 7: Glazing and Finishing (Weeks 20-28)

Glazing panels are installed, roofing completed, and the structure made watertight. Internal works including flooring, electrics, heating, plastering, and decoration follow.

Thermal Performance and Energy Efficiency

A common concern about glazed extensions is temperature control—being too hot in summer and too cold in winter. With modern glass technology, this is no longer an issue.

Modern Glass Solutions

High-performance glazing like New Generation Glass provides:

Low U-values (under 1.0 W/m²K) for excellent thermal insulation
Solar control blocking up to 86% of solar heat gain
High light transmission (70%+) maintaining brightness
UV protection (99%) preventing furnishing fade

This means your oak conservatory can be comfortable year-round without excessive heating or cooling costs.

Heating Options

Building Regulations require conservatories to have independent heating. Options include:

Underfloor heating: Popular choice providing even, unobtrusive warmth
Radiators: Extend existing central heating system
Air source heat pump: Efficient and environmentally friendly
Electric panel heaters: Simple solution for occasional use spaces

Room Outside

Oak Frame Specialists | Established 1973 | 50+ Years Experience

Room Outside has designed and built oak framed buildings across Kent, Surrey, Sussex, Hampshire, and London for over 50 years. Our team includes experienced designers, master craftsmen, and project managers who specialise in traditional oak construction combined with modern glazing technology. We handle projects from initial design through planning approval to final completion. Call 01243 538999 for expert advice.

Areas We Cover

Room Outside designs and builds oak framed conservatories, orangeries, and garden rooms across the South East of England:

England West Sussex East Sussex Surrey Hampshire Kent Essex Greater London Berkshire Dorset

View our project gallery or contact us to discuss your oak frame project.

Sources, References, and Further Reading

Official Sources: UK Planning Portal (planningportal.co.uk) – Permitted Development Rights; Historic England – Listed Building Consent Guidelines; Building Regulations 2010 (as amended) – Part L and Part A.

Industry Bodies: Timber Frame Business Council; Oak Frame Carpenters Association; Glass and Glazing Federation – Thermal Performance Standards.

Industry Experience: Room Outside – 50+ years oak frame construction experience; proprietary project data from completed installations across South East England.

Last updated: February 2026 | Expert review: Construction specifications verified against current Building Regulations

Frequently Asked Questions

How much does an oak framed conservatory cost in the UK in 2026?

Oak framed conservatories cost from £30,000 for small structures to £100,000+ for large orangeries. A medium-sized conservatory (20-30m²) typically costs £45,000-£70,000. Costs depend on size, complexity, oak type (green or air-dried), and glazing specification.

Do I need planning permission for an oak conservatory in the UK?

Many oak extensions fall under Permitted Development and don’t require planning permission. However, listed buildings always need Listed Building Consent plus planning permission. Properties in Conservation Areas, AONBs, or National Parks may also require permission.

How long does an oak frame last compared to other materials?

Oak framed buildings can last 100+ years with proper maintenance. Many medieval oak structures remain sound after 500+ years. Compared to uPVC (20-25 years) or aluminium (30-40 years), oak offers exceptional longevity and long-term value.

What is the difference between green oak and air-dried oak?

Green oak is freshly cut with 40-60% moisture, costs ~30% less, but shrinks as it seasons. Air-dried oak (18-25% moisture) is more stable but more expensive. Both are suitable for construction when designed correctly. Green oak movement is accommodated in the joinery design.

What maintenance does an oak frame require annually?

Oak requires minimal maintenance: annual inspection of joints and drainage, cleaning gutters, and optionally sealing/oiling every 3-5 years to maintain colour. Untreated oak naturally weathers to silver-grey. Oak doesn’t need preservative treatment.

Can you add an oak extension to a listed building?

Yes—oak is often the preferred material for listed buildings. Conservation officers favour oak because it’s traditional, uses authentic construction methods, and complements period properties. You’ll need Listed Building Consent and planning permission.

Do oak conservatories need special foundations?

Yes, oak frames require proper foundations. Green oak weighs approximately 1,000 kg per cubic metre. Foundations typically include concrete strip footings or raft, damp-proof course, and raised base to keep oak clear of ground moisture.

How long does it take to build an oak conservatory?

Total project time is typically 4-7 months: design and planning (4-10 weeks), oak frame manufacture (6-10 weeks), groundwork and frame erection (3-5 weeks), and glazing/finishing (3-6 weeks). Complex projects or those requiring planning permission may take longer.

Will an oak conservatory be too hot in summer?

Not with modern glazing. High-performance glass blocks up to 86% of solar heat while maintaining high light transmission. Combined with proper ventilation and optional blinds, oak conservatories can be comfortable year-round regardless of weather.

Does an oak frame add value to a property in the UK?

Yes—quality oak extensions typically add 5-10% to property values. Oak commands a premium over standard materials due to its perceived quality, exceptional longevity, and appeal to buyers seeking character and craftsmanship.

Call us on 01243 538999 – David our digital assistant will take a few details so the right specialist can follow up personally.

Discuss Your Oak Frame Project

Whether you’re considering an oak conservatory, orangery, or garden room, our specialists can help you explore the options for your property. Call us on 01243 538999 – David our digital assistant will take a few details so the right specialist can follow up personally. Or book a free design consultation with no obligation.

Book Free Consultation

Room Outside: Oak frame specialists since 1973.
England, West Sussex, East Sussex, Surrey, Hampshire, Kent, Essex, Greater London, Berkshire, Dorset

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Aluminium vs Timber vs uPVC: Choosing the Right Frame in 2026

For most East Sussex conservatory projects in 2026, aluminium is the strongest all-round frame choice.

Aluminium, timber and uPVC at a glance

Why aluminium leads in 2026

Slimmer frame lines

Low maintenance

Coastal suitability

Best fit

When timber still makes sense

Use timber when appearance rules the brief

Further Reading: Conservatory & Glass Extension Guides

Choose uPVC for simple budgets

Avoid forcing it into premium designs

A frame is only part of the comfort equation

East Sussex checks before you decide

Go with aluminium if…

Consider another route if…

Planning and building regulations note

The 2026 verdict

The honest rule of thumb

Room Outside

Explore Room Outside guides

Conservatories by Room Outside

New Generation Glass Technology

Orangeries by Room Outside

Room Outside in East Sussex

Cost, lifespan and maintenance in 2026

Do not judge by frame price alone

Which frame looks right on different homes?

Modern coastal homes

Period and heritage properties

Simple family homes

Specification details to confirm before you commit

Ask about thermal breaks and glazing

Confirm coating and hardware for coastal exposure

Check ventilation and solar control

Clarify planning and building regulation assumptions

How to choose the right frame

The practical decision route

Questions to ask before approving your frame choice

Check the look and layout

Check comfort and upkeep

Sources and further reading

Frequently Asked Questions

Is aluminium better than uPVC for a conservatory?

Is timber worth the extra maintenance?

Can aluminium suit a traditional East Sussex home?

What should coastal homeowners ask for?

Design a Conservatory Frame That Suits Your Home

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Resources

Advice & Inspiration

Conservatories

Conservatory Refurbishment Costs: What You Get in 2026

Conservatories

Lantern Roofs Explained: When They Work, When They Don’t & What They Cost

Conservatories

The Cold Conservatory Problem: Causes & Permanent Fixes

Conservatory vs Orangery vs Glass Box: A Buyer’s Framework

Quick comparison at a glance

Conservatory

Orangery

Glass Box Extension

1. Understanding the three options

Conservatory

Orangery

Glass Box Extension (Frameless/Structural Glass)

2. Cost breakdown (2026 UK data)

3. Planning permission & Building Regulations

4. Thermal performance & year‑round comfort

5. Property value contribution

6. A buyer’s decision framework

Choose a conservatory if…

Choose an orangery if…

Choose a glass box if…

Explore Room Outside’s products & guides

External sources and further reading

Frequently asked questions

Recent Articles