Price Guide 2026
Glass Extensions Price Guide
Discover complete pricing for luxury orangeries from £35k, modular glass extensions, frameless extensions & garden rooms. Honest, itemized quotes for premium home extensions.
50+
Years Experience
2000+
Projects Completed
10yr
Warranty
Call us anytime – David, our digital assistant, will take a few details so the right specialist can follow up with you personally.
Since 1973
Family Business
10-Year Guarantee
Comprehensive Coverage
No Hidden Costs
Transparent Pricing
Honest Pricing
Premium Extensions,
Transparent Prices
Every quote includes design, building control, materials, installation, and warranty. No surprise costs.
At Room Outside, we believe in complete transparency. No “starting from” nonsense where the real price is double. Just honest, itemized pricing from the UK’s leading glass extension specialists with over 50+ years of experience.
2026 Price Guide
Complete Pricing for Every Budget
All prices include design consultation, building control compliance, professional installation & 10-year warranty.
Luxury Orangery Extensions
Premium orangery extensions transform your winter garden connection. Our solid insulated orangeries with New Generation Glass technology keep you warm through December and cool in July.
Small (3m × 4m)
from £35,000
Medium (4m × 5m)
from £50,000
Large (5m × 6m)
from £75,000
- Insulated cavity walls (U-value 0.18)
- New Generation Glass lantern
- Building regulations compliance
- 10-year structural warranty
Why Orangery?
60% solid insulated roof + 40% thermal glass = year-round comfort
Modular Extensions
Factory-built glass extensions installed in just 5-7 days. Quality without the 12-week construction chaos.
Traditional Build
12 weeks
Our System
5-7 days
- Factory-built modular panels
- Precision steel frame
- Premium thermal insulation
- 50+ year lifespan
Custom Quote
Based on dimensions, location & specifications
Frameless Glass
Modern frameless extensions maximizing natural light and garden views with structural glass technology.
Starting From
£35,000+
- Frameless glass panels
- Structural glass engineering
- Thermal glass specification
- Building compliance
Best For
Modern homes, unobstructed views, maximized light
Groom Outside
Professional deep valet cleaning & maintenance for conservatories, orangeries & glass extensions.
Single Clean
Custom Quote
Annual Plan
Custom Quote
- Full interior & exterior cleaning
- Glass polishing & protection
- Frame & structure cleaning
- Maintenance inspection
Perfect For
Keeping your glass extension looking brand new
New Generation Glass
Advanced thermal glass technology upgrade for existing extensions. Year-round comfort without full rebuild.
Quote Based On
Glass Area Size
- Reduces glare by up to 50%
- Blocks 99% of UV rays
- Superior thermal control
- 10-year glass warranty
Perfect For
Existing extensions needing thermal upgrade
Oak Framed Extensions
Premium oak framed extensions combining natural beauty with modern performance. Perfect for period properties.
Premium Pricing
Custom Quote
- Grade A oak framing
- Thermal glass specification
- Architectural design
- 10-year structural warranty
Best For
Character properties, premium aesthetics
Plan Ahead
Book Now, Enjoy by Summer 2026
When you book makes a critical difference in your completion date
RECOMMENDED
- January Booking (Now)
JAN
Consultation & Site Visit
Start the new year with your project
FEB
Design Complete
3D visualizations finalized
MAR
Planning Submitted
Application to local authority
MAY
Construction Begins
Work starts on site
JUL
Project Complete
Entire summer to enjoy!
- March Booking (Delayed)
MAR
Consultation & Site Visit
Schedule begins
APR
Design Development
Design period
MAY
Planning Submitted
Application to authority
JUL
Construction Begins
Peak summer building
SEP
Project Complete
Summer already passed
Book now = enjoy by summer. 2 months difference.
July completion = 4+ months of prime garden use | September completion = heading into autumn
Customer Reviews
What Our Customers Say
Real feedback from homeowners who transformed their properties
“We’re absolutely delighted with our orangery. The team were professional from start to finish. The pricing was transparent with no hidden costs, and the quality is exceptional.”
Sarah Johnson
West Sussex
“The modular extension was installed in just 6 days with minimal disruption. The quality is outstanding and the team were incredibly professional. Highly recommend.”
Michael Roberts
Surrey
“We’re absolutely delighted with our orangery. The team were professional from start to finish. The pricing was transparent with no hidden costs, and the quality is exceptional.”
Emma Carter
Hampshire
What’s Included
What’s Included in Every Quote
Everything you need for a complete, professional glass extension project
Professional Design
Expert consultation to understand your vision. Complete space analysis and design exploration. Free with no obligation.
3D Visualizations
Professional 3D renderings showing exactly how your extension will look from multiple angles.
Detailed Quote
Complete specification and transparent pricing within 5 days. Every item itemized with no hidden extras.
Building Compliance
All building control approvals and planning compliance included. We handle all the regulations.
10-Year Warranty
Comprehensive structural warranty included. Insurance-backed guarantees for your complete protection.
24-Hour Response
Our design team aims to respond to all enquiries within 24 hours. Quick turnaround on all project information.
Common Questions
Frequently Asked Questions
About Our Pricing
Everything you need to know about our transparent pricing, what’s included, and how we deliver premium glass extensions.
Our pricing includes everything: professional design, building control approvals, premium materials, expert installation, and 10-year warranty. We don’t use budget materials or rushed installation. We’ve perfected our craft over 50+ years.
“At Room Outside, we design for decades, not just installation day.”
Yes, completely. Building regulations, planning approval handling, and all compliance work is included in our quoted price. These are always made transparent so you know what each cost is.
A typical orangery or conservatory project takes 4-6 months from consultation to completion, including design, planning approval, and installation.
Modular extensions are faster: just 5-7 days on-site installation after planning approval—total project time as little as 8-12 weeks.
No. Our quotes are completely transparent. Every line item is specified. If something isn’t in the quote, we don’t charge for it. This transparency is core to how we operate.
Conservatories have large glass roofs that don’t insulate well, becoming unusable by October. Orangeries have 60% solid insulated roofs with 40% thermal glass lanterns.
The result: orangeries stay warm in winter and don’t overheat in summer. They’re usable year-round.
We structure payments around project milestones — typically a deposit to secure your build slot, a mid-project payment when materials are delivered, and a final balance on completion. Your Design Consultant will outline the exact payment schedule during the quotation process.