A room for every season
Thermally broken, insulated and double or triple glazed, so it stays warm in winter and calm in summer.
Glass Extension
A Light Filled Room for Every Season, from £30,000 including VAT, base and groundworks
About the Glass Extension
All the feeling of a new extension, without the building project
Imagine a room that brings the garden into your home all year round. Warm and quiet in winter, bright and open in summer, and installed in 1 to 2 weeks rather than months. The Glass Extension is built on the Sunparadise Hawaii 80 2.0 system, a fully insulated, thermally broken aluminium structure with a double or triple glazed roof. There is no architect to brief, no months of bricklaying and plastering, and under 30 m² it is normally exempt from building regulations. Every room is made to measure, installed nationwide by our own team, and covered by our 10 year warranty. Prices start from £30,000 including VAT, with the base and groundworks included.
- A room you will use every day, in every season
- Base and groundworks included in the price
- Normally no building regulations under 30 m²
- 10 year warranty, installed by our own team
- 10 Year Warranty
- As Seen on TV
- Finance Available
- Made to Measure
Glass Extension Installations
Engineered in Europe for true year round living. Here is what sits behind the comfort.
The frame
Insulated aluminium profiles with polyamide thermal breaks and XPS rigid foam. The frame is thermally broken, so the room stays warm and free of cold draughts.
The glass
The roof can be double or triple glazed, and triple glazing is a core option. Glass units run from 28 to 62 mm, with a toughened outer pane and a laminated inner pane. Solar control Low-E is available. A sandwich panel, from 12 to 58 mm, can be used instead of glass.
Warmth
In the manufacturer’s worked example, a Hawaii 80 2.0 room with triple glazing (Ug 0.6 W/m²K) reaches 0.86 W/m²K for the whole room. Each project has its own heat transfer calculation to EN 13947 and EN ISO 10077.
Rain and the floor
Internal drainage guides rainwater and condensation away through the wall connection, rafters, posts and base profile. Made to measure Stadur insulation at floor level reduces cold bridging.
Size and strength
Spans up to 6.7 m without steel or a middle post, and larger spans are possible with one. Roof depth is up to 6.7 m, with larger depths on request. Pitch runs from 5° to 45°, and snow and surface load is up to 5.0 kN/m².
Roofs
Standard roof types, plus bespoke designs. The structure can be wall mounted, cantilevered or free standing.
Colour
17 Trend colours and 33 Individual colours, including white, cream, anthracite, black and moss green. Any RAL or NCS colour is available as Unique. Bi-colour is available, with one colour inside and another outside.
Quiet and secure
Certified sound insulation and wind resistance. Burglar resistance is in line with RC3.
Certification and warranty
EN 1090 structure (EXC 2) with in-house production control, EN 14351-1 elements, CE marked, ISO 9001 and ISO 14001. The coating is QUALICOAT certified. Covered by a 10 year warranty with Open Space Concepts.
Product brochures
At a glance
- Width
- Up to 6.7 m without a middle post
- Depth
- Up to 6.7 m, with larger depths on request
- Roof pitch
- 5° to 45°
- Glazing
- Glass 28 to 62 mm, or a sandwich panel 12 to 58 mm
- Thermal example
- 0.86 W/m²K for the whole room with triple glazing
- Snow load
- Up to 5.0 kN/m²
- Finish
- 17 Trend and 33 Individual colours, or any RAL or NCS
- Warranty
- 10 years
Roof Shapes
Gable
Lean-to
Bay
Faceted
L-Shaped
Gable Return
Pavilion
Circular
The Structure
Glass Extension or Brick Extension?
A traditional extension means architects, approvals and months of building work. A Glass Extension is a warm, light filled room for every season, with the base and groundworks included.
Glass Extension
Base and groundworks included
Base and groundworks included
Brick Extension
A traditional build
A traditional build
Price
From £30,000 including VAT
From about £1,900 per m² before fees
Fees
Design included
Architect, engineer and building control
Building regulations
Normally exempt under 30 m²
Always required
Time on site
1 to 2 weeks
8 to 16 weeks
Light
Glass roof and walls, spans to 6.7 m
Doors and rooflights
Warranty
10 years
Depends on the builder
A brick extension of about 30 m² is often £57,000 to £84,000 before fees. See our full guide to glass extension costs. Building regulations exemption depends on size, thermal separation and independent heating.
Why choose Open Space Concepts
The extension feel, without the build
Base and groundworks included, no architect, and normally no building regulations under 30 m².
Light from every angle
Glass roof and walls with spans up to 6.7 m keep your garden views open.
10 year warranty
Installed nationwide by our own team, with transparent, upfront pricing.
Additional Features
A few of the details that make the room easier to live in, from the first evening through to winter.
Integrated LED Rafter Lighting
Soft, even light along the rafters turns evenings into the best part of the day.
Komet 55 Roof Window
Fresh air at the touch of a button, with a manual or electric roof window.
Integrated Shading
Keep the room calm and comfortable on the brightest days.
Bi-colour Finish
One colour inside and another outside, so the room can suit both the house and the interior. Choose from 17 Trend colours and 33 Individual colours, including white, cream, anthracite, black and moss green, or any RAL or NCS colour. On-screen colours can differ from the powder coat, so we match from a sample.
Snow Trap
Added peace of mind through the winter, for roofs that need to hold snow load.
Glazing Options
Choose the glass for the way you want the room to feel. Every option is there to keep it comfortable, quiet and secure. A sandwich panel is available instead of glass in the roof.
Double or Triple Glazing
The roof can be double or triple glazed, and triple glazing is available as a core option. Units start from 28 mm, with a toughened outer pane and a laminated inner pane.
Solar Control Low-E
A solar control Low-E coating takes the heat out of bright days and helps the room hold its warmth in winter.
Tinted Glass
Tinted glass softens strong sunlight and gives the room a calmer, more private outlook.
Laminated Safety Glass
The inner pane is laminated, so the glass holds together if it is struck. It is the same approach used for security glazing.
Mirror Glass
Mirror glass keeps the view out while giving you privacy from the garden and the street.
Sandwich Panel
A sandwich panel, from 12 to 58 mm, can be used in the roof instead of glass.
Choose Your Doors and Walls
Open the whole room to the garden in summer, close it to a warm, quiet space in winter.
Thermoslide 80 Sliding Doors
Highly insulated sliding doors that open the room to the garden, then close it into a warm, quiet space.
Supertherm 80 Bifold Doors
Fold the wall away when the weather is good, and close it back to a sealed, insulated room.
Supertherm 80 Fixed Glazing and Tilt and Turn Windows
Fixed glass for the view, with tilt and turn windows where you want ventilation without opening the whole wall.
Monoslide 80 Corner Sliding Doors
A corner that slides aside, so two sides of the room can open to the garden.
Get Your Free Quote
Receive an estimated price and expert advice, no obligation. Prefer to see it first? Visit our showroom.
Prefer to see it first? Visit our showroom.
From ideas on paper to your first morning coffee outside
-
1
The Chat
A completely free, relaxed consultation where we chat about your vision and get precise measurements. -
2
The Visual
We create a bespoke 3D design so you can see exactly how it will look in your garden before anything is built. -
3
The Build
Precision-manufactured to the millimetre, ensuring flawless structural integrity. -
4
The Arrival
Our in-house installation team takes over. We are quick, clean, respectful, and entirely self-sufficient. -
5
The Handover
A full walkthrough with you, standard checks, and your comprehensive guarantee officially activated.
Questions? Already answered.
How much does a glass extension cost?
Our Glass Extension starts from £30,000 including VAT, with the base and groundworks included. The final price depends on size, glazing and doors, and every room is made to measure.
How is it different from a glass room?
Our glass rooms are beautiful garden spaces. The Glass Extension is built to be lived in every day: an insulated, thermally broken frame with double or triple glazing, so it feels like part of your home all year round.
Will it be warm in winter?
Yes. The polyamide thermal breaks, rigid foam insulation and double or triple glazed roof are designed for year round comfort. In the manufacturer’s worked example with triple glazing, the whole room achieves 0.86 W/m²K.
Do I need planning permission?
Many glass extensions fall within permitted development, for example a single storey rear extension up to 3 m deep on an attached house or 4 m on a detached house, and no more than 4 m high. Larger projects and designated areas may need approval. We will advise during your free design consultation.
Does it need building regulations approval?
Glazed extensions under 30 m², thermally separated from the house by external quality doors and with independent heating, are normally exempt. Larger rooms or an open connection to the house need approval, and we will guide you through it.
Are the base and groundworks included?
Yes. The base and groundworks are included in our price.
What warranty do I get?
Every Glass Extension comes with our 10 year warranty.
How long does installation take?
A Glass Extension is typically installed in 1 to 2 weeks.
Can it stand without a wall behind it?
Yes. The system can be wall mounted, cantilevered or free standing.
Why Choose Us
Transparent, upfront pricing and outdoor structures built to last.
Our commitment to top tier structures is unwavering, and we pride ourselves on delivering the highest quality installations. We offer clear indicative quotes by phone or email, with no pushy sales tactics and no hidden costs.
We source our materials from Italy and Germany, engineered to withstand even the harshest of UK winters. Our commitment to both quality and price ensures exquisite structures, expertly installed, with a promise of excellence you can rely on.
Speak with our experts- 10 Year Warranty
- Upfront Pricing
- As Seen on TV
- 25 Years Experience
- 2,000+ Projects Installed
- Nationwide Installation
Spread The Cost With Our Finance Options
Speak with one of our experienced surveyors and they will run through our finance options.
0808 168 00438am to 5pm, Monday to Friday
- We can process your application and give you a decision straight away
- Flexibility to make additional payments
- Manage everything in one place with your online account
Finance illustration only. Subject to status and affordability. Open Space Concepts is a credit broker, not a lender.
Don't Just Take Our Word
See what our customers are saying.
Vue Pod
H Parkinson
Wonderful product - kept informed of progress throughout the order. Installers arrived promptly and did a great job of the installation. Very happy with our new garden building.
Louvre Pod Glass Room
L Moss
The personnel at Open Space Concepts were professional from our initial enquiry, to measuring up and installation of our bespoke pergola room.
Vue Grande
J M
A couple of weeks ago we had a glass room and veranda installed at our home and could not be happier. The staff were very professional and friendly from the sales staff to the fitting team. The quality of the materials is excellent.