What is an open plan living-dining conservatory extension?

It's a glass extension that combines a living area and dining space into one open-plan layout, often with direct garden access. It typically replaces an external wall to create a seamless flow between the house and the new extension.

Do I need planning permission for a living-dining conservatory?

Many single-storey rear extensions fall under Permitted Development if they meet size limits (≤4m detached, ≤3m terraced) and height restrictions. However, listed buildings, Conservation Areas, or larger extensions require planning permission. Always check with your local authority.

Can I remove the external wall between house and conservatory?

Yes, but it's structural work that requires building regulations approval. A steel beam or lintel is usually needed to support the upper floor. This must be designed by a structural engineer and installed by a qualified builder.

What type of roof is best for an open plan living-dining extension?

A combination lean-to with a central gable-end roof feature is popular—it adds height, drama, and extra light. Fully glazed roofs maximise daylight, while solid insulated roofs (or hybrid) improve thermal performance. Self-cleaning solar-control glass is recommended.

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

Many oak framed conservatories fall under Permitted Development rights and don't require planning permission, provided they meet size and height restrictions. However, planning permission IS required if: your home is listed, you're in a Conservation Area or AONB, the extension exceeds Permitted Development limits, or you're building close to boundaries. Listed buildings also require Listed Building Consent, though oak is generally favoured by conservation officers due to its traditional nature. Always check with your local planning authority before starting work.

How long does an oak framed conservatory last?

Oak framed buildings can last 100+ years with proper maintenance. Many medieval oak-framed buildings in the UK are still standing after 500+ years. Oak is naturally resistant to decay due to its high tannin content. The key to longevity is proper design (keeping oak off the ground and away from moisture), quality construction, and regular maintenance (sealing every 3-5 years). Compared to uPVC (20-25 years lifespan) or aluminium (30-40 years), oak offers exceptional long-term value.

What maintenance does an oak framed conservatory require?

Oak framed conservatories require: sealing/oiling every 3-5 years to maintain appearance (optional - untreated oak weathers to silver-grey), annual inspection of joints and fixings, checking glass seals and drainage, cleaning gutters and ensuring water drains away from the oak frame. Oak is naturally durable and doesn't require preservative treatment. The main enemy is standing water, so ensure good drainage and ventilation. Regular maintenance ensures your oak frame lasts 100+ years.

roomoutsideuk

18th February, 2026

Open Plan Living-Dining Conservatory Extension – A Stunning Home Upgrade

Open Plan Living-Dining Conservatory Extension – A Stunning Home Upgrade | Room Outside

Living-Dining Extension Guide 2026

Open Plan Living-Dining Conservatory Extension – A Stunning Home Upgrade

Create a seamless, light‑filled space for relaxing and entertaining. Design tips, glass roof ideas, bifold doors, utility integration & expert advice.

📖 18 min read

✅ Updated February 2026

🏡 UK Specialist Guide

💡 Quick answer: what is an open plan living-dining conservatory?

An open plan living-dining conservatory extension combines a lounge and dining area into one bright, glass-walled space that flows directly from your home. By removing the external wall, you create an uninterrupted connection to the garden. Features often include a gable-end roof feature, bifold or French doors, and integrated utility areas. With modern solar-control glass and underfloor heating, it’s comfortable year‑round and can increase property value by 5‑10%.

+40%

perceived space increase

86%

solar heat blocked

10-14

weeks build time

5-10%

added property value

Imagine a space where family dinners flow into relaxing evenings, where the boundary between indoors and garden melts away, and where natural light fills every corner. That’s the promise of an open plan living-dining conservatory extension. Our clients, a family in West Sussex, wanted exactly that: a spacious, versatile area that would serve both as a bright dining space for entertaining and a comfortable lounge for everyday relaxation—while keeping their original living room as a cosy retreat.

In this comprehensive guide, we’ll walk through their project, exploring every design decision, structural consideration, and finishing touch that turned their vision into reality. Whether you’re planning a similar extension or just gathering ideas, you’ll find detailed insights on roof styles, door configurations, utility integration, and the technical side of removing an external wall.

Seamless Flow Between Indoors and Outdoors

Open plan living-dining conservatory with white timber frame and French doors leading to garden

The defining feature of this project was the decision to remove the entire external wall between the existing house and the new extension. This single change transforms the experience: from the kitchen, your eye travels uninterrupted across the dining table, through the lounge, and out into the garden. No step, no narrow doorway—just a smooth transition that makes both spaces feel larger.

But removing an external wall is not a DIY task. It requires:

Structural assessment: A steel beam (or RSJ) must be designed to carry the load of the upper floor. In this case, a 4.5m galvanised steel beam was installed, recessed into the ceiling to keep the profile clean.
Foundations: The new extension’s foundations were tied into the existing footings, with additional depth where the original wall was removed.
Building Regulations approval: All structural work must be signed off. Your builder or architect typically handles this.
Temporary propping: During installation, the upper floor was supported with Acrow props to ensure safety.

⚠️ Critical: thermal bridging

When removing a wall, ensure the new junction between house and extension is properly insulated to prevent cold spots. Use thermally broken cavity trays and continuous insulation.

A Stylish & Functional Conservatory Design: The Gable Feature

The roof design can make or break an open plan space. A standard lean-to roof (sloping in one direction) is simple and effective, but our clients wanted something with more architectural presence. The solution? A central gable-end roof feature that rises above the lean-to slope, creating a dramatic triangular focal point.

Gable-end roof feature on white timber conservatory, adding height and light

Why combine lean-to and gable?

Visual interest: The gable breaks the monotony of a flat roofline, drawing the eye upward.
Extra light: The vertical face of the gable can be fully glazed, flooding the centre of the room with sunlight.
Height and space: Inside, the ceiling soars in the gable section, making the room feel grander—ideal above a dining table or lounge seating.
Symmetry: When placed centrally, the gable anchors the whole extension, giving a balanced, elegant facade.

To maximise comfort, the entire roof was fitted with solar-control, self-cleaning glass (U-value 1.0 W/m²K). An electrically operated skylight in the gable face provides automated ventilation—fresh air at the touch of a button.

Perfect Symmetry & Garden Access

The footprint was designed to be highly functional while maintaining a pleasing aesthetic from both inside and out.

Zoning the space

Left side (utility): A separate utility room was tucked to the right (as you look from the house). It houses washing machine, dryer, and storage, hidden behind a partition wall but accessible via a half-glazed door. This keeps laundry noise and clutter away from the open plan area.
Central dining zone: Directly ahead as you enter, with space for an 8-seater table.
Right side lounge: A comfortable seating area with two floor-length windows overlooking the garden.

Door configuration – symmetry matters

From the outside, the white timber-framed conservatory presents a perfectly symmetrical elevation:

Large French doors open from the lounge onto a round mosaic patio – perfect for stepping out with a morning coffee.
Double patio doors on the left connect the kitchen to the garden via the utility room, creating a handy route for bringing in shopping or muddy boots.
Two floor-length windows on the right mirror the patio doors opposite, maintaining visual balance.
Decorative dwarf brick walls match the existing house brick, tying the extension to the original structure.

Symmetrical white conservatory with French doors and matching windows, dwarf brick walls

Year-Round Comfort: Insulation, Heating & Glazing

An open plan living-dining space must be usable in January as well as July. Here’s how we achieved that:

Insulation

Below floor: 100mm PIR insulation board beneath the screed, with edge insulation to prevent thermal bridging.
Walls: Cavity walls with blown bead insulation (U-value 0.18).
Roof: Triple-layer low-E argon-filled glazing with warm-edge spacers.

Heating

Underfloor heating (water-based) was installed throughout the extension, zoned separately for the lounge and dining areas. This provides gentle, even warmth without radiators breaking up the glazing. The system runs off the existing gas boiler, with an independent thermostat.

Glazing specification

G-value: 0.35 (blocks 65% solar heat, reducing summer overheating)
Light transmission: 72% (keeps the space bright)
Self-cleaning coating: photocatalytic layer that breaks down dirt – rain washes it away.

❄️ Winter warmth tip

Combine underfloor heating with low-E glass and insulated blinds for maximum comfort. The thermal mass of a screed floor absorbs heat during the day and releases it slowly in the evening.

Bright interior of open plan living-dining conservatory with modern furniture

Planning Permission & Building Regulations

Most single-storey rear extensions in England 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

This project sat within those limits, so no full planning application was needed. However, because we removed an external wall, Building Regulations approval was mandatory. Key aspects checked:

Structure: Steel beam design and calcs.
Thermal performance: U-values of glazing, floor, walls.
Ventilation: Opening skylight (equal to 5% of floor area) for purge ventilation.
Electrical safety: Part P certification for all new circuits.

Listed buildings, Conservation Areas, AONBs always require permission. See our full planning guide for details.

How Much Does an Open Plan Living-Dining Conservatory Cost?

Costs vary significantly based on size, specification, and site conditions. For a medium-sized extension (25-35m²) similar to this project:

Timber frame & glazing: £35,000 – £55,000
Foundations & groundworks: £8,000 – £15,000 (depends on soil type)
Steel beam & wall removal: £3,000 – £6,000
Underfloor heating & screed: £4,000 – £7,000
Internal finishes (plastering, flooring, electrics): £6,000 – £12,000

Total estimated range: £55,000 – £95,000 + VAT. Gable roof features, bifold doors (instead of French), and high-end glazing add to the cost.

Dining area in open plan conservatory with garden view

✨ The finished space: living, dining, utility, garden

With its light-filled atmosphere and seamless layout, this open plan living-dining conservatory extension has transformed how the family uses their home. The integrated utility keeps practical chores out of sight; the generous lounge and dining area host gatherings with ease; and the garden is now a true extension of the living space. Whether it’s a quiet Sunday with books or a summer dinner party, the room adapts effortlessly.

Room Outside

Established 1973 | Glass extension specialists

We’ve designed and built hundreds of open plan living-dining extensions across Sussex, Surrey, Hampshire, Kent and London. Our team handles everything from design through planning to final build. Call 01243 538999 for expert advice.

West Sussex East Sussex Surrey Hampshire Kent Essex London Berkshire

Frequently Asked Questions – Open Plan Living-Dining Conservatories

Can I really remove the whole wall between house and conservatory?

Yes, but it’s structural. You’ll need a steel beam (RSJ) designed by an engineer, plus Building Regulations approval. The work must be done by a qualified builder. The result is a completely open, seamless space.

What’s the best roof for an open plan living-dining extension?

A combination lean-to with a central gable-end roof feature is extremely popular. It adds height, drama, and extra light. Fully glazed with solar-control glass, it stays bright without overheating.

How do I zone a living and dining area in a conservatory?

Use furniture placement: dining table near the kitchen/house end, lounge seating toward the garden. Different floor finishes (tiles in dining, timber in lounge) can also define zones without closing off the space.

Will a glass extension be too cold in winter?

Not with modern glazing. Low-E coatings, argon gas fills, and warm-edge spacers give U-values as low as 1.0. Combined with underfloor heating, it’s comfortable all year.

Can I add a utility room to my open plan conservatory?

Absolutely. In the project shown, a separate utility was tucked to one side, accessed via a half-glazed door. It keeps laundry hidden but convenient.

What doors are best for garden access?

French doors offer classic charm and wide openings; bifold doors fully retract to merge indoors and outdoors. For symmetry, match door sizes and positions on each side.

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 open plan living-dining extension

Book a free consultation (virtual or on‑site). We’ll discuss your layout, roof style, glazing options, and provide a fixed quotation.

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roomoutsideuk

09th February, 2026

Oak Framed Conservatories: A Basic Guide

Oak Framed Conservatories, Orangeries & Garden Rooms: Complete 2026 UK Guide | Room Outside

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 conservatory with full-height glazing and traditional oak beams

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.

Detailed view of oak frame joinery and construction

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 orangery with brick walls and glass lantern roof

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.

Oak framed garden room with solid walls and large windows

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 framed extension on a traditional listed building

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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roomoutsideuk

17th December, 2025

Glass Extensions Surrey | What Homeowners Need to Know 2025 | Room Outside

What Surrey Homeowners Should Know Before Commissioning a Glass Extension | Room Outside

Surrey Homeowner Guide

What Surrey Homeowners Should Know Before Commissioning a Glass Extension

Expert guide to Surrey’s unique planning landscape, realistic budgets, and what actually adds value to your property in 2025.

12 min read

Surrey, England

40+ Years Expertise

📋 The Short Answer

Before commissioning a glass extension in Surrey, you need to understand three things: (1) whether your property falls within the 73% of Surrey designated as Green Belt, which affects what you can build; (2) whether Permitted Development rights apply (most conservatories under 4m don’t need planning permission); and (3) budget expectations—with average Surrey property prices at £587,000, quality glass extensions typically cost £40,000-£120,000+ depending on specification.

So You’re Thinking About a Glass Extension in Surrey?

Let’s be honest: you’ve probably already scrolled through Pinterest boards, saved a dozen Instagram posts, and imagined morning coffee in a light-flooded kitchen-diner. The vision is clear. But somewhere between the dream and the reality, questions start multiplying.

Will I need planning permission? How much should I actually budget? Is my Edwardian terrace in Guildford even suitable? What about my 1930s semi in Woking that backs onto Green Belt?

These aren’t hypothetical concerns. After forty years of building glass extensions across Surrey—from Farnham to Reigate, Epsom to Dorking—we’ve heard them all. This guide answers the questions Surrey homeowners actually ask, with specific information relevant to properties in this county.

Because Surrey isn’t like anywhere else. It’s the second most expensive county in England (average price £587,000). It has more Green Belt than almost anywhere—73% of the county. And one quarter sits within the Surrey Hills National Landscape, with its own planning considerations.

Your glass extension project needs to account for all of this. Here’s how.

The Surrey Planning Landscape: What Makes This County Different

Before we discuss designs, materials, or budgets, let’s address the elephant in the room: can you actually build what you want?

Green Belt: 73% of Surrey Is Protected

Surrey’s Metropolitan Green Belt isn’t a single park—it’s a planning designation that covers nearly three-quarters of the county. In practical terms:

Woking Borough: approximately 70% Green Belt
Guildford Borough: 24,040 hectares of Green Belt (most in Surrey)
Mole Valley: extensive coverage protecting countryside character
Epsom and Ewell: smallest Green Belt area (1,560 hectares) but still significant

The good news: Green Belt doesn’t prevent home extensions. Permitted Development rights still apply in most cases. But councils follow a general ‘50% rule’—extensions shouldn’t increase the original house size by more than 50% in area and volume, and must have minimal visual impact on the landscape.

Surrey Hills National Landscape: A Quarter of the County

The Surrey Hills Area of Outstanding Natural Beauty (now officially a ‘National Landscape’) stretches from Farnham in the west to Oxted in the east, including the chalk slopes of the North Downs and the wooded Greensand Hills around Haslemere.

If your property falls within the Surrey Hills:

Permitted Development rights are more restricted for rear extensions
Design must conserve and enhance ‘natural and scenic beauty’
Local materials and styles are strongly encouraged (Bargate stone, clay tiles)
The Surrey Hills Board provides design guidance and may comment on applications

Conservation Areas and Listed Buildings

Every Surrey borough has Conservation Areas—from Guildford’s medieval town centre to Reigate’s Victorian suburbs. Properties within these areas face additional restrictions:

No Permitted Development for side extensions
No cladding of exterior walls
No rear extensions beyond one storey under PD rights
Design must preserve or enhance the Conservation Area’s character

Listed buildings require Listed Building Consent for almost any alteration—including internal works. This isn’t a barrier to beautiful glass extensions, but it does require specialist knowledge and early engagement with your local conservation officer.

Do You Actually Need Planning Permission?

Here’s something that surprises many Surrey homeowners: most conservatories and single-storey glass extensions can be built without planning permission under Permitted Development rights.

The Permitted Development Rules (2025)

Your glass extension qualifies as Permitted Development if it meets ALL of the following:

Requirement	What This Means
Maximum projection from rear wall	4m for detached houses, 3m for semi/terraced
Maximum height	4m at highest point (3m if within 2m of boundary)
Garden coverage	Cannot cover more than 50% of original garden area
Position	Must be at rear of property (not front or side facing highway)
Materials	Must use similar materials to existing house
Eaves and ridge	Cannot be higher than the existing house

When You Definitely Need Planning Permission

Your property is a listed building
You’re in a Conservation Area and want a side extension or two-storey rear
Your project exceeds PD size limits
Previous extensions have already used your PD allowance
Your property is a flat or maisonette (no PD rights)
PD rights were removed by condition on original planning consent (common in 1970s+ builds)

Our recommendation: Even if you believe you qualify for Permitted Development, consider obtaining a Lawful Development Certificate (LDC) from your local council (£103). This provides legal certainty that’s valuable when selling your property.

Realistic Budgeting for Surrey Property Owners

Let’s talk money—because Surrey prices aren’t like anywhere else, and neither should your expectations be.

The Surrey Premium

With average property prices at £587,000 (and significantly higher in Elmbridge, Waverley, and parts of Guildford), your glass extension is protecting a substantial asset. Cutting corners on specification makes no financial sense when:

A quality extension adds 5-10% to property value (RICS, Savills)
Poor-quality builds can actually devalue your home
Surrey buyers are discerning—estate agents report that dated conservatories are now liabilities

What Should You Expect to Pay?

Project Type	Budget Range	Notes
Standard conservatory (uPVC)	£15,000-£30,000	Entry point, 20-35yr lifespan
Premium conservatory (aluminium)	£30,000-£50,000	40-50yr lifespan, slimmer frames
Orangery (brick/glass hybrid)	£40,000-£70,000	Ideal for period properties
Contemporary glass extension	£50,000-£90,000	Minimal frames, max glazing
Bespoke glass box / structural glass	£80,000-£150,000+	Architectural statement pieces

Hidden Costs to Budget For

Structural engineer fees: £500-£1,500
Building Regulations application: £200-£500
Planning application (if required): £206 for householder applications
Party Wall surveyor (if applicable): £700-£1,000 per surveyor
Landscaping/making good: 5-10% of project cost
Blinds/climate control: £2,000-£8,000 depending on specification

What Surrey Property Buyers Actually Want

If you’re thinking about resale value (and in Surrey, you should be), here’s what local estate agents tell us buyers are looking for:

Year-round usability

The old polycarbonate conservatory that’s freezing in winter and sweltering in summer? That’s now seen as a negative. Buyers want spaces that work 365 days a year.

Seamless kitchen-diner flow

The extension that opens directly onto an existing kitchen—creating one large, light-filled entertaining space—commands more premium than a separate ‘added on’ room.

Quality over size

A beautifully executed 3m x 4m extension with slim aluminium frames and quality glazing will add more value than a cheap 5m x 5m box.

The Process: From First Idea to Completion

Here’s what a typical glass extension project looks like with Room Outside:

Phase	Timeline	Key Activities
Phase 1: Design Consultation	2-4 weeks	Initial site visit, planning constraints review, preliminary designs, budget discussions
Phase 2: Planning & Permissions	4-12 weeks	Permitted Development assessment, Building Regulations drawings, structural calculations
Phase 3: Construction	6-12 weeks	Groundworks, structural work, frame installation, glazing, internal finishes

Frequently Asked Questions: Surrey Glass Extensions

Do I need planning permission for a conservatory in Surrey?

Most conservatories do not need planning permission under Permitted Development rights. Your project qualifies if it extends no more than 4m from the rear wall (detached houses) or 3m (semi/terraced), is under 4m high, and covers less than 50% of your garden.

How much does a glass extension cost in Surrey?

Quality glass extensions in Surrey typically cost £30,000-£90,000, with bespoke structural glass projects reaching £150,000+. Standard uPVC conservatories start around £15,000-£30,000. Factor in an additional £3,000-£5,000 for professional fees.

Can I build a glass extension if my Surrey property is in the Green Belt?

Yes. Green Belt status doesn’t prevent home extensions—Permitted Development rights still apply. With 73% of Surrey designated as Green Belt, most extensions are built successfully within these areas.

Will a glass extension add value to my Surrey home?

A well-designed glass extension typically adds 5-10% to Surrey property values (RICS, Savills). On a £587,000 average Surrey property, that’s £29,000-£58,000. However, quality matters for maintaining value.

What are the restrictions for glass extensions in Surrey Hills AONB?

Properties in the Surrey Hills National Landscape have more restricted Permitted Development rights and stricter design requirements. Extensions must conserve and enhance ‘natural and scenic beauty’ with local materials encouraged.

How do I choose between aluminium, timber, and uPVC frames?

For contemporary Surrey homes, aluminium offers the slimmest sightlines and longest lifespan (40-50 years). For period properties or Conservation Areas, timber may be required for planning approval. uPVC provides the best value but with bulkier frames.

Ready to Discuss Your Surrey Project?

Our design consultations are free, with no obligation. We’ll visit your property, discuss your vision, review any planning constraints, and provide honest guidance on what’s achievable within your budget.

Request a Design Consultation Call 01243 538999

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01st May, 2025

Want a Fast Home Extension Without the Disruption?

If you’ve ever wanted to add space to your home but dreaded the chaos of a major building project, a fast home extension without disruption could be the perfect solution. For some, the thought of weeks of builders, mess, and noise is enough to put them off altogether.

But what if there was a better way?

Build Without the Headaches

Traditional home extensions take time. Builders dig foundations, lay bricks, and work around unpredictable weather. It’s slow, messy, and often stressful.

That’s why we’re offering something different.

This innovative new system uses precision-engineered parts built off-site. These are delivered and assembled quickly at your home. As a result, installation takes days instead of months — a fast home extension without disruption and minimal interruption to your daily life.

Designed to Suit Your Home

Whether you want a bright kitchen, a stylish dining room, or a garden retreat, this system gives you flexibility. It works with most house types and even fits on existing bases in many cases.

You get all the benefits of a traditional extension, without the long wait.

Comfortable All Year Round

One big concern with glazed structures is keeping them warm in winter and cool in summer. This system solves that.

Thanks to high-performance insulation in the walls, floor, and roof, your space stays comfortable all year. You can also choose New Generation Glass to reduce glare, control solar gain, and improve energy efficiency.

Built to Last, Easy to Maintain

Durability matters. These materials are long-lasting and require very little upkeep. So you’ll spend less time on maintenance and more time enjoying your home.

Ready to Extend Without the Stress?

You don’t need to live on a building site to get more space. With this fast, clean, and energy-efficient system, you can have your dream extension — without the drama.

Fast build
Warm and quiet
Stylish and practical

Get in touch to book your free design consultation.

https://www.roomoutside.com/get-a-quote/

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12th May, 2024

What is the Difference Between an Orangery and a Conservatory?

When planning a home extension, many homeowners choose between an orangery and a conservatory. Both add space and natural light, but they differ in design, structure, and function. The main difference is the roof. An orangery has a flat solid roof with a central glass lantern. A conservatory has at least 75% of its structure covered with a glass roof, though often the entire roof is glass.

This guide explores these distinctions to help you decide which suits your needs.

GLASS EXTENSION OPTIONS

What is the Difference Between an Orangery and a Conservatory?

The main difference between an orangey and a conservatory is the roof. An orangery traditionally has a flat solid roof with a glass lantern in the centre. A conservatory has at least 75% of the structure covered with a glass roof, but more usually the entire roof is made of glass.

Large orangery with a full coverage lantern roof.

What is an orangery?

An orangery is a stylish extension that blends solid structures with large windows and a glass roof lantern. Originally built to protect exotic plants, modern orangeries create bright, airy spaces that integrate well with your home. They can be attached to your house or stand alone in your garden as a home office, summer house, or guest accommodation.

Key Features of an Orangery:

Solid roof with a glass lantern for insulation and natural light.
Brick or solid pillars for a sturdy, permanent feel.
Large windows and doors, often with bi-fold or French doors opening to the garden.
Better insulation for year-round comfort.
Seamless design that blends with your home’s architecture.

Inside a modern uPVC conservatory with a full glass roof.

What is a conservatory?

A conservatory is a predominantly glass structure that maximises natural light and offers panoramic garden views. Traditionally, conservatories have been used as sunrooms or garden rooms, providing a bright and open space.

Key Features of a Conservatory:

Fully glazed roof and walls, allowing in maximum sunlight.
Lightweight framework, typically made from uPVC, aluminium, or timber.
Dwarf walls (optional) to add stability while maintaining a spacious feel.
Varied roof styles, including Victorian, Edwardian, and lean-to designs.
Ideal for summer use, though modern glazing improves year-round comfort.

Planning Permission & Building Regulations

In most cases, conservatories and orangeries fall within permitted development rights, meaning you won’t need planning permission as long as they meet certain conditions. However, if your property is in a conservation area, is a listed building, or if the structure exceeds size limits, you may need to apply for planning permission.

Building regulations apply if you plan to remove an external wall between your home and the extension, use complex structural elements, or want to ensure high energy efficiency. Our experts can advise and help you with all of this!

Orangery vs Conservatory: Key Differences

Feature	Orangery	Conservatory
Roof Style	Solid roof with glass lantern	Fully glazed roof
Wall Structure	Brick pillars & large windows	Mostly glass walls with optional dwarf walls
Insulation	Higher insulation, ideal for all-year use	Good insulation, but may need heating in winter
Design Feel	Blends with home architecture	Light, airy, and garden-focused
Cost	Generally more expensive	More budget-friendly
Build Length	Longer due to structural complexity	Shorter, quicker to install

Which One Should You Choose?

Your choice depends on how you plan to use the space and your home’s style. If you’re looking for a solid, well-insulated extension that feels like a natural part of your home, an orangery is a great option. If you prefer a light-filled garden room with a full glass structure, a conservatory might be the better choice.

No matter your preference, our expert team can help you design the perfect orangery or conservatory to suit your home and lifestyle.

Speak to One of Our Design Experts Today to Explore Your Options!

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Modern & Traditional Conservatory Inspiration

A conservatory is one of the best ways to extend your home. It creates a light-filled, stylish, and practical space that you can enjoy all year round. Whether you prefer a traditional or modern design, a conservatory helps you connect with your garden while adding valuable living space.

Why Choose a Conservatory?

More natural light – A glazed roof and large glass walls make the space feel bright and airy.
Quick installation – Minimal construction work is needed beyond the foundations, making it one of the easiest ways to extend your home.
Perfect for any property – Whether you own a period or contemporary home, conservatories can be designed to match your style.
Fully customisable – Choose from different frame materials, colours, and decorative details to create a unique space that complements your home

Find Inspiration for Your Conservatory Extension

Thinking about adding a conservatory? Explore our stunning customer projects to see how others have transformed their homes.

Large Open Plan Gable-Ended Conservatory Extension with Additional Utility Room.

Full glass conservatory roof over a lounge dinner glass extension

Traditional Lean-To Grey Painted Timber Conservatory on a Country Home

Grey timber framed lean-to conservatory with double doors out to the patio

Inside a grey timber framed lean-to conservatory with roof light windows

Inside of white timber framed lean-to conservatory

Quaint Country Chic Cream Timber Lean-To Conservatory on a Cottage

White timber framed lean-to conservatory

Modern Grey uPVC Conservatory with Contrasting White Internal Frames and Bi-Fold Doors

Grey Framed uPVC Conservatory on a large modern new build property

Round Timber Conservatory Extension with Panoramic Views of The Garden and Harbour

Large round white timber framed conservatory in beautiful gardens with a view of the lake

Large Modern Timber-Framed Conservatory Lounge and Dining Room

Luxurious cream timber framed conservatory with large windows and high glass roof

Luxurious cream timber framed conservatory with dwarf walls and double doors to the garden

See More & Get Expert Advice

Looking for even more design inspiration? Take a look at our full customer project gallery for ideas.

Our team of specialists are happy to help with design advice, answer any questions, and provide a no-obligation quote tailored to your needs.

Get in touch today and start planning your dream conservatory!

Start Designing Your Dream Glass Extension Today

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03rd March, 2024

12 Top Questions Answered About Building a Conservatory or Orangery

If you’re thinking about extending your home by building a conservatory or orangery, you’re probably in the research phase. You may have questions about designing and building your dream glass extension.

As specialists with over five decades of experience, we’ve helped hundreds of homeowners create stunning and practical glass spaces. To make things easier, we’ve put together this quick-fire guide to the 12 most frequently asked questions about conservatories and orangeries.

1. How much does a conservatory or glass extension cost?

This depends on size, materials and finish.

Off-the-shelf options start at £5,000, but they often lack customisation and quality.
A bespoke uPVC conservatory starts from £20,000, including materials and installation.
Orangeries typically start at £35,000, though smaller ones may cost less.
Frameless glass structures are premium, starting at £30,000 for small designs, with most ranging between £40,000 – £80,000.

When comparing prices, always check what’s included—some low-cost options exclude groundwork and installation.

2. What is the difference between an orangery and a conservatory?

The key difference is the roof:

A conservatory has at least 75% of its roof made of glass.
An orangery has a solid flat roof with a glass lantern in the centre.

Other glass extension terms include:

Garden room – Often used to describe a conservatory, but traditionally has a solid tiled roof.
Sunroom – A general term for a bright, relaxing space.

Garden room – Often used to describe a conservatory, but traditionally has a solid tiled roof.

Sunroom – A general term for a bright, relaxing space.

3. What frame materials can I choose from?

Your choice of frame affects appearance, durability, and maintenance. Options include:

uPVC – Affordable, low maintenance, and sleek.
Hardwood timber– Traditional and sustainable, requiring occasional painting or staining.
Aluminium -Modern, lightweight, and strong.
Frameless glass – Contemporary and ultra-modern.
Oak– premium timber with a luxurious feel.

Each material has different colour and finish options, allowing you to create a look that suits your home.

4. Will a glass room be too hot or too cold?

Not if you choose the right glass and insulation.

Without the correct glass, conservatories can get too hot in summer and too cold in winter.
UV-protective glass prevents overheating and reduces glare.
Insulated glass keeps warmth in during colder months, reducing energy costs.
Investing in temperature-controlled glass ensures year-round comfort.

5. Do I need planning permission to build a conservatory?

Usually, no, as long as it meets Permitted Development Rights:

It must be less than 6 metres (semi-detached) or 8 metres (detached) from the house.
It should not extend beyond the front of your property.
Listed buildings or homes in conservation areas require planning permission.

For more details, check Planning Portal UK or read our “Do I Need Planning Permission?” guide.

6. How large can my conservatory be under permitted development?

Terraced/Semi-detached homes – Up to 6 metres.
Detached homes – Up to 8 metres.

If your home has previous extensions, this may reduce the size allowance.

7. Do I need sign-off from building regulations?

Not always. No approval is needed if your conservatory:

Is under 30m².
Has external-grade doors/windows separating it from the main house.
Uses separate heating from the main home.
Has at least 50% glazed walls and a glass or translucent roof.

If you plan to remove doors or create an open-plan space, building regulations approval is required.

8. Can I add a glass extension on a listed property?

Yes, but planning permission is required.

Listed building consent is essential for Grade I and II properties.
Hardwood timber is often preferred over uPVC for aesthetic reasons.
Frameless glass box extensions are increasingly popular, as they blend modern design with historical character.

9. Can I open up my home to my conservatory?

Yes! However, structural support and building regulations approval are required.

Removing doors between your house and your conservatory.
Consider insulation and overheating risks to maintain comfort in all seasons.
Additional structural reinforcements may be needed, especially for larger openings.

10. Do I need foundations for a conservatory?

Yes. Strong foundations prevent subsidence, ensure durability, and improve insulation. A conservatory cannot be built on open ground or a temporary base.

11. How long will the build take?

Conservatories and orangeries are quicker to build than traditional extensions.

Most projects take 6 to 12 weeks from groundworks to completion.
Frameless glass structures may take longer due to custom fabrication.

With less disruption than a brick-built extension, a glass room is a great way to expand your home quickly and efficiently.

12. Do conservatories require a lot of maintenance?

Regular maintenance ensures your conservatory lasts for decades.

uPVC & aluminium – Low maintenance, requiring occasional cleaning.
Timber – Needs repainting/staining every 2-4 years.
Glass – Should be cleaned every 3-6 months.

For best results, consider professional conservatory cleaning to maintain clarity, seals, and moving parts.

Still have questions?

We hope this guide has answered your most common conservatory questions. If you need more details or personalised advice, our team is happy to help.

💬 Get in touch today for expert guidance and a no-obligation quote!

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24th November, 2023

Extending Your Home: Conservatory vs Garden Room

If you are thinking about extending your home, you may be comparing different options.

There are many choices, from a traditional extension to a fully glass design.

Two popular options are the conservatory and the garden room. But what is the difference between them?

Definitions

What is the Definition of a Conservatory and a Garden Room?

Conservatory
A room with a glass roof and walls. It is attached to your home and is often used as a sun lounge.

Garden Room
A room in your garden with a door or window. It usually has a solid or tiled roof and can be a separate building.

Conservatory Design

A conservatory is mostly made of glass. Its full glass roof lets in plenty of natural light. This design dates back to when conservatories were used to grow plants. The modern glass technology available now makes the room temperature comfortable, keeping the heat in winter and reducing the heat during the summer.
Not all glass is equal, so it is important to choose high-quality glass within your budget. Conservatories can be built with full-height glass or a mix of glass and walls. They come in many styles, such as lean-to or gabled roofs, and use materials like uPVC, timber, oak, or aluminium.

A conservatory is always attached to your home. Many people choose to remove part of the wall to create an open-plan space. However, this may require building regulations approval and extra work on insulation and heating.

Conservatory Benefits:

Extends your home’s floor plan
Easy access from the main house
Bright and airy space
Minimal construction required
Can add value to your home
Ideal for dining or relaxing
Open-plan design possible
Bi-fold or French doors open to the garden
Provides a good view of the garden

Garden Room Design

A garden room can be attached to your home or built as a separate structure. It has a tiled or flat roof instead of a full glass roof. Some designs add skylights or a glass gable to let in extra light.
A tiled roof offers better insulation and can lower the cost per square metre. Garden rooms offer more privacy and are ideal for guest accommodation, a home office, or a studio. There are various options for frame and wall materials, such as oak or timber, to match your home’s style.

Garden Room Benefits:

Can serve as an extension or a standalone structure
Less construction than a traditional extension
Can mimic the look of a traditional extension
Adds value to your home
Better insulation from a solid roof
Lower investment due to less glass
More privacy
Ideal for a guest room, studio, or office
French or bi-fold doors open fully to the garden

Let Us Help You Decide

Still not sure which option to choose? Our specialists are here to help. We can discuss your requirements, answer your questions, and provide a no-obligation quote. We can also share design examples for inspiration

Talk to a Specialist About Your Project

Get a Quote

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Resources

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Design & Planning

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

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roomoutsideuk

28th September, 2023

Does a Glass Roof Make Your Conservatory Too Hot?

Does a Glass Roof Make Your Conservatory Too Hot? | Room Outside

Conservatory Solutions 2025

Does a Glass Roof Make Your Conservatory Too Hot?

Stop your beautiful glass room from becoming an unusable summer greenhouse. Discover the technology that keeps your conservatory comfortable all year round.

8 min read

Expert Solution

Kent, Surrey, Sussex, London

Quick Answer: Does a Glass Roof Have to Overheat?

No. A full glass roof doesn’t have to make your conservatory unbearably hot. The issue isn’t glass itself, but the type of glass used. Standard conservatory glass acts like a greenhouse, trapping heat. New Generation Glass uses advanced technology to reflect 86% of solar heat while maintaining crystal-clear views. You don’t need to compromise with polycarbonate or solid roofs that ruin the glass room experience.

86%

Solar heat reflected

<1.0

U-value (W/m²K)

40°C→26°C

Typical temp reduction

99%

UV protection

Each summer, thousands of UK homeowners face the same frustration: their beautiful glass conservatory transforms into an unusable greenhouse, hitting temperatures of 40°C+ while the rest of the house remains comfortable. You invested in a bright, airy space to connect with your garden—not to avoid it for 4-5 months each year. The truth is, the right glass technology keeps your space comfortable all year round, and you don’t have to compromise on design to get it.

The Real Problem: Why Your Conservatory Overheats

Conservatories overheat due to uncontrolled solar gain—a process where sunlight passes through ordinary glass and converts to heat that gets trapped inside. This isn’t just about air temperature; it’s about thermal radiation that heats up surfaces, furniture, and creates an environment that’s physically uncomfortable to be in.

🔥

With Ordinary Glass

40°C

On a typical British summer day (28°C outside), ordinary glass allows infrared radiation to flood in, turning your conservatory into:

An unusable space for 4-5 months each year
A furnace that damages furniture and fabrics
An energy drain if you try to cool it with AC
A wasted investment in your home

❄️

With New Generation Glass

24°C

The same summer day becomes perfectly comfortable with technology that:

Reflects 86% of solar heat before it enters
Maintains bright, clear views without tinting
Creates a usable space year-round
Protects furnishings from UV damage

📊 The Physics of the Problem

Solar radiation consists of three components: visible light (what we see), ultraviolet (causes fading), and infrared (carries heat). Standard glass blocks most UV but transmits most visible light AND infrared. The infrared radiation gets absorbed by interior surfaces, which then re-radiate heat at longer wavelengths that cannot escape back through the glass—this is the greenhouse effect in action.

The Flawed Compromises You Should Avoid

For years, conservatory companies have offered solutions that “solve” the overheating problem by compromising on the very thing you wanted: a beautiful glass room.

🔲

Polycarbonate Roofing

Plastic sheets with air gaps

Severely distorts light and view
Creates dim, industrial appearance
Reduces some heat
Better for carports, not premium conservatories

🧱

Tiled/Solid Roof

Traditional roofing materials

Destroys connection to outdoors
Loses the airy, light-filled feel
Cuts heat build-up
Turns conservatory into standard extension

🎨

Tinted/Reflective Glass

Applied films or body-tinted glass

Noticeable colour cast (bronze/blue)
Reduces visible light transmission
Some heat reduction
Alters interior/exterior appearance

🌟

New Generation Glass

Advanced solar control technology

Crystal clear, no tint or distortion
Reflects 86% of solar heat
Maintains bright, natural light
True glass conservatory experience

The fundamental issue with all compromise solutions is they treat the symptom by removing or altering the cause—the glass itself. At Room Outside, we believe the better approach is to enhance the glass’s performance, allowing you to enjoy the full aesthetic benefit without thermal penalty.

How New Generation Glass Actually Works

Unlike standard double glazing that simply slows heat transfer, New Generation Glass uses spectrally selective coatings—microscopic layers that act like a ‘smart filter’. They allow visible light to pass through (keeping your room bright) while reflecting 86% of infrared heat before it even enters your space.

The Technology Behind the Comfort

🔬

Solar Control Coating

A microscopically thin metallic layer applied via magnetron sputtering technology that reflects infrared heat while transmitting visible light.

🛡️

Low-E Coating

Facing the interior, this coating reflects long-wave radiant heat back into the room during winter while allowing beneficial solar gain.

💨

Argon Gas Fill

Inert, dense argon gas between panes (34% better insulation than air) significantly slows heat transfer in both directions.

🔗

Warm-Edge Spacers

Thermally broken composite materials eliminate cold bridges at glass edges, reducing condensation and improving overall U-value.

🇬🇧 Engineered for British Weather

New Generation Glass wasn’t developed in a laboratory vacuum. It was engineered through real-world testing across hundreds of installations in the South East. We’ve specifically addressed the unique challenges of British weather:

Variable Season Performance: Works efficiently whether it’s 30°C in July or -2°C in January
Humidity Control: Warm-edge technology reduces condensation that plagues many conservatories
Low-Light Efficiency: Maintains thermal performance even on cloudy days
Durability: Withstands British weather extremes without degradation

Real Results: The Henderson Family, Surrey

From Unusable to Year-Round Living Space

The Henderson family’s south-facing conservatory had become a “no-go zone” from May to September, with temperatures regularly hitting 42°C on summer afternoons. They were considering replacing it entirely with a solid extension until they discovered New Generation Glass.

After upgrading their roof glass, the transformation was immediate. On the same August afternoon that previously reached 42°C, their conservatory now stabilises at a comfortable 26°C. The space has become their favourite room for morning coffee, afternoon reading, and evening relaxation—truly usable year-round.

42°C → 26°C

Peak temperature reduction

35%

Reduction in cooling costs

365

Days of use per year

The Room Outside Advantage: Why We’re Different

🌟 Pioneers in Glass Technology

We were the first in the UK to introduce the revolutionary Wonderglass™ from Four Seasons Sunrooms in 1999. This wasn’t merely a product launch; it was a paradigm shift that proved a glass roof could be thermally competent without compromising on aesthetics.

Since then, our New Generation Glass has evolved through two decades of refinement, specifically for the unique challenges of the British climate. It represents the culmination of 50+ years of experience creating beautiful, comfortable glass extensions across Kent, Surrey, Sussex, and beyond.

What New Generation Glass Offers You

☀️

Unmatched Solar Control

Reflects up to 86% of the sun’s rays, reducing heat build-up to keep spaces 10-15°C cooler than with standard glass.

❄️

Outstanding Thermal Performance

Exceptionally low U-value (under 1.0 W/m²K) helps retain warmth in winter, reducing heating costs.

🔬

Advanced Insulation

Warm edge technology and argon gas filling boost overall efficiency beyond standard double glazing.

🛡️

Superior UV Protection

Blocks virtually all harmful UV rays, protecting your furniture, artwork, and fabrics from fading.

👁️

Crystal Clear Views

No tint or colour distortion—just bright, natural light and perfect visibility of your garden.

💰

Return on Investment

Transforms your conservatory from seasonal to year-round use, adding real value to your home.

Your Potential Savings & Benefits

£400-£800

Annual energy savings (reduced AC & heating)

5-6

Extra months of usable space per year

10-15%

Potential increase in property value

Stop Compromising on Your Dream Conservatory

Book your no-obligation thermal assessment today and discover how New Generation Glass can transform your space from a summer greenhouse to a year-round living area.

See the Proof

Watch our radiometer heat demonstration that visually shows the dramatic difference.

Get Precise Analysis

Receive a tailored temperature assessment for your specific conservatory.

Limited Availability

Summer assessment slots are filling fast—book before the next heatwave.

Book Thermal Assessment & Demo Call 01243 538999

Room Outside Glass Technology Team

Specialists in High-Performance Glass for UK Homes Since 1973

With over 50 years of experience in glass extensions across the South East, our technical team has tested virtually every glass technology available. We developed this comprehensive guide because we believe homeowners deserve clear, factual information about how to solve conservatory overheating—not just technical specifications. New Generation Glass represents our commitment to creating truly comfortable, energy-efficient living spaces that work with the British climate.

Sources & Technical References

Glass and Glazing Federation: Technical Standards for Thermal Performance; Building Research Establishment: UK Climate Data for Building Design; Chartered Institute of Building Services Engineers: Guide to Solar Gain Management; Room Outside Laboratory: Comparative Thermal Testing Data 2015-2024; Four Seasons Sunrooms: Wonderglass™ Technical Specifications 1999; Room Outside Customer Satisfaction Surveys 2020-2024.

Frequently Asked Questions

Does New Generation Glass look different or tinted?

Not at all. The advanced solar control and low-emissivity coatings are almost completely invisible to the naked eye. Your views remain stunningly clear, bright, and neutral, without the green or blue tinge of older coated glasses.

Can my existing overheated conservatory be upgraded?

Yes. We regularly retrofit older conservatories with New Generation Glass. The transformation is often described by clients as ‘like gaining a completely new room.’ We conduct a full survey first to ensure compatibility with your existing framework.

How does it work in winter to keep heat in?

The low-emissivity (Low-E) coatings reflect interior heat back into the room while still allowing visible light to pass through. Combined with argon gas filling and warm-edge spacers, this creates a thermal barrier that significantly reduces heat loss with a U-value of less than 1.0 W/m²K.

Is this just expensive double glazing?

No, it’s fundamentally different technology. While standard double glazing simply slows heat transfer, New Generation Glass uses spectrally selective coatings that act like a ‘smart filter,’ allowing visible light through while reflecting 86% of infrared heat before it enters your space.

What about condensation issues in winter?

New Generation Glass significantly reduces condensation through its warm-edge spacer technology and overall improved thermal performance. By keeping the interior glass surface warmer, there’s less temperature difference between the glass and room air, which minimises condensation formation.

How long do the coatings and performance last?

The coatings are permanently bonded to the glass at a molecular level during manufacturing and located inside the sealed glass unit where they’re protected from weather, cleaning, and physical contact. They will last the lifetime of the glass unit itself—typically 20+ years—without degradation of performance.

Does it work for all conservatory orientations?

Yes, but the benefits are most pronounced for south and west-facing conservatories that receive the most direct sunlight. East-facing rooms benefit from morning sun control, while north-facing rooms still gain from the superior insulation properties in winter.

Is there a visible demonstration of the heat control properties?

Absolutely. We have a “tunnel of heat” demonstration using radiometers that visually shows the dramatic difference in heat transmission between standard glass and New Generation Glass. You can see this demonstration in our showroom or during a consultation.

Questions about preventing conservatory overheating? Call our technical team on 01243 538999 or send us a message

Experience the Difference for Yourself

Don’t compromise on your dream of a beautiful, comfortable glass conservatory. See how New Generation Glass can transform your space into a year-round living area you’ll actually use and enjoy. Book a consultation to experience our thermal demonstration and receive expert advice tailored to your specific conservatory.

Book a Consultation & Thermal Demo View Our Comfortable Conservatories

Room Outside: Creating comfortable, beautiful glass extensions since 1973.
Serving Kent, Surrey, Sussex, Hampshire, London and across the South East.

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Open Plan Living-Dining Conservatory Extension – A Stunning Home Upgrade

💡 Quick answer: what is an open plan living-dining conservatory?

Seamless Flow Between Indoors and Outdoors

⚠️ Critical: thermal bridging

A Stylish & Functional Conservatory Design: The Gable Feature

Why combine lean-to and gable?

Perfect Symmetry & Garden Access

Zoning the space

Door configuration – symmetry matters

Year-Round Comfort: Insulation, Heating & Glazing

Insulation

Heating

Glazing specification

❄️ Winter warmth tip

Planning Permission & Building Regulations

How Much Does an Open Plan Living-Dining Conservatory Cost?

✨ The finished space: living, dining, utility, garden

Room Outside

Frequently Asked Questions – Open Plan Living-Dining Conservatories

Can I really remove the whole wall between house and conservatory?

What’s the best roof for an open plan living-dining extension?

How do I zone a living and dining area in a conservatory?

Will a glass extension be too cold in winter?

Can I add a utility room to my open plan conservatory?

What doors are best for garden access?

Design your open plan living-dining extension

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Oak Framed Conservatories, Orangeries & Garden Rooms

Quick Answer: Oak Framed Extensions

Key Facts: Oak Framed Extensions (UK 2026)

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What Makes Oak Special as a Building Material?

Definition: Green Oak vs Air-Dried Oak

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

Oak Framed Conservatory

Oak Orangery

Oak Garden Room

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Factors Affecting Oak Frame Costs

Do You Need Planning Permission for an Oak Conservatory?

When Permitted Development Usually Applies

When Planning Permission IS Required

You WILL Need Planning Permission If:

Oak Extensions on Listed Buildings

How Long Does an Oak Frame Last?

Historical Evidence of Oak’s Longevity

Keys to Oak Frame Longevity

Oak Frame Maintenance Requirements

Annual Maintenance Tasks

Periodic Maintenance (Every 3-5 Years)

To Treat or Not to Treat?

Common Misconceptions About Oak Frame Buildings

Myth #1: “Oak frames are too expensive”

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

Myth #3: “Oak frames require constant maintenance”

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

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

The Oak Frame Building Process

Stage 1: Initial Consultation (Week 1-2)

Stage 2: Design Development (Weeks 3-8)

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

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

Stage 5: Site Preparation (Weeks 14-18)

Stage 6: Frame Erection (Weeks 18-20)

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

Thermal Performance and Energy Efficiency

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