Bespoke glass extension opening onto a landscaped garden
50+ Years of Excellence • 2000+ Projects Completed

Luxury
Conservatories,
Orangeries & Glass
Extensions

Transform your home with bespoke conservatories, orangeries, & frameless glass extensions. Award-winning designs for homeowners across the UK.

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01243 538999

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★★★★★ 5/5 Rating Over Last 2 Years • Google Reviews
Premium Glass Extensions

Bespoke Conservatories, Orangeries & Glass Extensions

Each glass extension is individually designed by our expert designers, crafted to complement your home’s unique architecture and built to last a lifetime.

Bespoke glass conservatory with white frames From £25,000

Conservatories

Bespoke conservatories in timber, aluminium & UPVC. Victorian, Edwardian and contemporary styles crafted to complement your home’s architecture.

  • Timber, Aluminium & UPVC options
  • Victorian & Edwardian styles available
  • Full planning permission support
Bespoke orangery extension with lantern roof and brick pillars From £35,000

Orangeries

The perfect blend of traditional architecture and modern comfort. Solid roof sections with stunning lantern features for year-round living.

  • Lantern roof designs available
  • Brick pillar construction options
  • Superior thermal insulation
Compare Your Options

Conservatory vs Orangery vs Glass Box

Not sure which glass extension is right for your home? Compare features, prices, and benefits to make an informed decision.

Conservatories
From £25,000

Build time: 6–10 weeks

Best for: Traditional & period properties


  • Period-style architecture
  • Maximum natural light
  • Multiple frame material choices
Orangeries
From £35,000

Build time: 10–14 weeks

Best for: Year-round living spaces


  • Lantern roof feature
  • Enhanced thermal performance
  • Brick pillar construction available
Glass Box Extensions
From £40,000

Build time: 8–12 weeks

Best for: Modern & contemporary homes


  • Seamless indoor-outdoor flow
  • Contemporary frameless design
  • Advanced structural glazing
Feature
Conservatory
Orangery
Glass Box
Price Range
£25,000 – £60,000
£35,000 – £80,000
£40,000 – £100,000+
Roof Type
Predominantly glazed
Solid roof with lantern
Flat or frameless glass
Wall Construction
Mostly glass panels
Brick pillars + glazing
Structural glass walls
Planning Permission
Usually not required
Sometimes required
Often required
Thermal Efficiency
Good with modern glass
Excellent
Excellent
Natural Light
Maximum
High
Maximum
Best For
Period homes, garden views
Year-round living
Contemporary homes
Do I Need Planning?

Planning Permission Quick Guide

Permitted Development

Most conservatories under 30m² don’t need planning permission if they meet building regulations. Read our full planning guide.

When You Need Permission

Listed buildings, conservation areas, or extensions exceeding 50% of your garden require formal approval before work begins.

Building Regulations

All glass extensions must meet Part L (thermal) and Part K (safety) building regulations as a minimum standard.

Project Schedule

Typical Project Timeline

1
Design Consultation
Week 1–2
Free home visit & design
2
Planning & Approval
Week 3–6
If required for your project
3
Manufacturing
Week 7–10
Built in our UK workshop
4
Installation
Week 11–14
Professional fitting team
5
Completion
Week 14+
Final snagging & handover
Start your timeline today — book your free consultation Limited availability for 2026 installations
The Room Outside Difference

Why UK Homeowners Trust Us

Discretion Trust Proven Over Time

For over 50 years, Room Outside has been commissioned by discerning homeowners and senior figures across British business and public life. Our work is undertaken privately and discreetly — from former FTSE leadership and members of the House of Lords to projects specified for recognised national and international organisations. We focus on exceptional design and engineering quality. Historic commissions have included senior roles within the automotive, finance, and hospitality sectors — with further details available on our Heritage, Discretion & Trust page.

Since 1973, designing and building beautiful glass extensions for discerning homeowners across the UK.

New Generation Glass Technology

Our exclusive glass maintains perfect temperatures year-round — never too hot in summer or cold in winter. Enjoy your extension 365 days a year.

50+ Years of Expertise

Since 1973, we’ve perfected every aspect of design, manufacturing, and installation. Trusted by over 2,000 homeowners across the UK.

Bespoke Design Service

Every project starts with your vision. Our award-winning design partners create extensions that complement your home’s unique architecture.

10-Year Comprehensive Guarantee

Complete peace of mind with our industry-leading guarantee covering all materials, workmanship, and structural integrity.

Energy Efficient & Sustainable

Our extensions can be designed to reduce heating costs by up to 30% with superior insulation and environmentally responsible materials.

Family-Owned & Trusted

As a family business, we treat every client like family — with respect, transparency, and a commitment to exceeding expectations.

Exclusive Service Areas

Where We Work

Based in West Sussex, Room Outside works with homeowners across the South of England and Greater London who care about quality, comfort, and considered design. Whatever the scale of your project, our approach remains the same: discreet, bespoke, and focused on long-term enjoyment.

Exclusive Service

Why the UK’s Discerning Homeowners Trust Room Outside

Discreet, bespoke service for properties of higher value — delivered with the craftsmanship and care we’ve refined over five decades.

Absolute Discretion

NDA-protected service for high-profile clients. Our team is trained in the highest levels of client confidentiality.

Bespoke Design Excellence

Architect-led designs that enhance your property. We work with listed buildings, historic estates, and contemporary architectural masterpieces.

Premium Materials

The world’s finest materials: German-engineered aluminium, English oak, and British-manufactured New Generation Glass technology.

Glass Extension FAQ

Common Questions About Glass Extensions

Find clear answers to the questions homeowners most often ask about bespoke conservatories, orangeries, and luxury glass extensions in the UK.

Room Outside conservatories typically start from £25,000. Most bespoke conservatories, orangeries, and glass extensions range from £25,000 to £60,000+, depending on size, design, glazing specification, site conditions, and location.

The best conservatory company for your project should offer proven craftsmanship, clear guarantees, strong customer reviews, bespoke design, and practical planning guidance. Room Outside specialises in premium glass extensions, conservatories, and orangeries using New Generation Glass.

Many conservatories and glass extensions can fall under Permitted Development rights, provided they meet the relevant limits and conditions. Listed buildings, conservation areas, flats, maisonettes, and larger designs may need extra checks, so we recommend reviewing the project before work begins.

New Generation Glass is Room Outside’s advanced glazing specification, designed to improve thermal comfort, reduce glare, and support year-round use of conservatories, orangeries, and glass extensions.

Most standard conservatory installations take around 6 to 10 weeks once approvals, surveys, and manufacturing are complete. Larger or more complex orangeries and glass extensions can take around 10 to 14 weeks.

We generally offer a 10-year structural guarantee on conservatories and glass extensions, alongside product-specific warranties for glazing, roofing systems, frames, and other materials.

Our consultation can include:

  • A home visit with a design specialist
  • Bespoke design advice tailored to your property
  • 3D visualisations, drawings, and specifications
  • Planning guidance before the project moves forward
  • Material samples and a written quotation

Orangeries usually cost more than traditional conservatories because they often include more brickwork, structural detailing, roof lanterns, and integrated building work. A typical orangery may cost around 20 to 40 percent more than a comparable conservatory.

Room Outside focuses on bespoke design, premium glazing, experienced installation, planning support, and long-term performance rather than off-the-shelf conservatory packages.

Modern glass extensions are designed to be low maintenance. Regular glass cleaning, gutter checks, and occasional inspection of seals and drainage channels usually keep the structure performing well.

Get Started

What Are Your Next Steps?

Buyer’s Guide

READ MORE

Start Planning

Contact Us
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Angeline Hudson profile picture
Angeline Hudson
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I recently moved into a house with a conservatory put up by Room Outside twenty five years ago which had never been serviced during that time and was in an extremely bad condition . It has needed a complete renovation carried out by the excellent service manager Matt and assistant Warwick , both of whom worked extremely hard throughout and were very polite and pleasant to have around . Matt was extremely knowledgeable and paid great attention to detail in all aspects of the work with the result that I am totally delighted with the appearance of the restored room --truly a five star service resulting in a beautiful room which it is now a great pleasure to spend time in . Thank you so much to Matt and Room Outside Angeline Hudson
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Joanne Turnbull profile picture
Joanne Turnbull
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So impressed with Room Outside and Matt! Our conservatory feels fresh and new — sparkling glass, spotless frames, and beautifully cared for. Matt was amazing. Highly recommend! 💫
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Marci Welch profile picture
Marci Welch
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I am so happy I picked Room Outside to service my conservatory. Matt is an amazing technician and was very knowledgeable and thorough cleaning and servicing my conservatory. I am so happy with the results and will call them if I need any future service.
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matt popham profile picture
matt popham
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We are absolutely delighted with our experience with Room Outside and cannot recommend them highly enough. From the very beginning, Richard Bennett guided us all through the design process with patience, professionalism, and integrity. It was clear from the outset that Richard has enormous knowledge of bespoke glass rooms, garden rooms and the bespoke New Generation Glass (NGG). His design capability is outstanding, and he came up with ideas and solutions that we would never have thought of ourselves. The end result is beyond what my client imagined – a beautiful, high-quality glass extension that has inspired their home and given space they can enjoy all year round. We were especially impressed by the attention to detail, reliability, and the smooth delivery of the project from start to finish. For anyone considering an orangery, conservatory or glass extension, we would say don’t hesitate — Room Outside gets our vote: great to find a company you can truly trust, with decades of experience, integrity at its core, and a proven record of creating stunning spaces. We could not be happier with our decision, and we know this will add value to their home for many years to come.
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Simon Kossoff profile picture
Simon Kossoff
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Super job, thank you
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Sean Read profile picture
Sean Read
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Delighted with our experience with Room Outside. Richard spent a great deal of time and effort to achieve exactly what we wanted. He has been in the industry all his career and you can tell as he had amazing knowledge of all the products. We are absolutely delighted with the end result and would have no hesitation in recommending Room Outside.
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Chris T profile picture
Chris T
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Despite the poor weather Matt carried out the maintenance and cleaning of our large conservatory very professionally and, as always, we are very happy with the outcome.
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Patricia Marples profile picture
Patricia Marples
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We recently had a bespoke conservatory at our Victorian west london home and the results have exceeded all our expectations. From the initial consultation to the final installation, the experience was seamless and professional. The space is now the heart of our home, flooded with natural light, offering a tranquil view of the garden I can’t recommend this company highly enough. They truly understand how to balance heritage aesthetics with modern functionality
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Digby Cutts profile picture
Digby Cutts
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Excellent, Matt starts and finishes with great enthusiasm and energy. He is always welcome in our home.
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Steve Cox profile picture
Steve Cox
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We have had (and continue to have) a great experience with Room Outside for the delivery of a glass roofed orangery. Richard Bennet was extremely patient during our initial flip-flopping on design. However he stuck with us and suggested a number of tweaks that demonstrated his considerable experience, together with a manufacturer (and next-gen glass solution) that he thought would deliver the right, quality outcome. It was a slight leap of faith, and we have subsequently learnt that this was one of the most challenging designs (irregular space) that they have encountered - but you wouldn’t have known it! Richard shepherded every aspect of the project without fuss and despite the complexity, the resulting structure was millimetre perfect. The outcome is spectacular - a high quality, contemporary wooden building that perfectly complements the 18C surroundings - and I can highly recommend the solar glass that Richard suggested - the room remains cool despite the recent blistering conditions! All in all a very satisfactory outcome.