Projects
Triple glazing for new builds and self-builds
On a self-build or small development, windows are a big line in the budget and a key part of the energy calculation (SAP, or the Home Energy Model under the Future Homes Standard). We price packages from your drawings, agree installation details with your builder, and deliver and fit to the programme.
Summary
Triple glazing is not required by Building Regulations for new homes, but it helps a new dwelling meet its overall energy target. In England, new-dwelling windows must not be worse than 1.6 W/m²K and the design reference uses 1.2; Wales sets 1.4; Scotland and Northern Ireland set averages of 1.6 and 1.4 across all windows and doors. Triple glazing reaches about 0.8 to 1.0, giving headroom elsewhere in the design.
What you get
| Pricing | From drawings or a window schedule |
|---|---|
| Coordination | Fixing details, cavity closers and tapes agreed in advance |
| Delivery | Phased to your build programme |
| Performance data | U-values and g-values for your energy assessor |
| Frames | uPVC, aluminium, timber or alu-clad |
| Typical lead time | 6 to 12 weeks |
Guide prices
Guide prices for typical projects; your quote is built from your own survey or drawings.
uPVC package
about 22 m2 of windows and doors
£11,195 – £13,895zero-rated for VAT when we supply and fit in a new home
- Triple glazed throughout
- Delivered and fitted to your programme
- Installation details agreed with your builder
Aluminium package
about 22 m2 of windows and doors
£18,895 – £23,595zero-rated for VAT when we supply and fit in a new home
- Slim sightlines, RAL colours
- Delivered and fitted to your programme
- Installation details agreed with your builder
Alu-clad timber package
about 22 m2 of windows and doors
£24,795 – £30,995zero-rated for VAT when we supply and fit in a new home
- Timber inside, aluminium outside
- Delivered and fitted to your programme
- Installation details agreed with your builder
Guide prices, supply and fit. The written quote after your survey fixes the price for the specification shown; anything extra is agreed with you first.
Is it right for your home?
A good fit for
- Self-builders and small developers
- Timber-frame and SIPs builds
- Projects aiming beyond the minimum standard
Think twice if
- Very tight schedules without drawings fixed
- Projects where the glazing spec has not been agreed with the energy assessor
Options
- Mixed frame types per elevation
- Large fixed and corner glazing
- Entrance, patio and bifold doors
- Airtightness installation details
- Solar-control glass on south and west faces
The Future Homes Standard and windows
The new Approved Document L for England, published in March 2026, comes into force on 24 March 2027 (24 September 2027 for higher-risk buildings). It keeps the limiting values for new-dwelling windows at 1.6 W/m²K, with a design reference of 1.2 now calculated at each window’s actual size. It does not make triple glazing compulsory. Wales’s 2026 edition takes effect on 4 March 2027 and keeps the 1.4 limit for new dwellings.
VAT on a new build
Supply and fitting by a VAT-registered contractor in the construction of a new home is normally zero-rated (HMRC VAT Notice 708), so the guide prices on this page carry no VAT. If you buy windows supply-only for a self-build, VAT at 20% is charged and you can usually reclaim it through HMRC’s DIY housebuilders scheme. Conversions and homes empty for two years or more can qualify for 5%. We confirm the VAT treatment on your quote.
Getting the installation right
Low U-values on paper can be lost at the installation joint. We agree where the window sits in the wall, how it is fixed and insulated, and which tapes seal it, before ordering, and give your assessor the data they need.
Building Regulations by nation
| Nation | Replacement windows | Sign-off |
|---|---|---|
| England | 1.4 W/m²K, or a Window Energy Rating of band B or better | Competent person scheme or building control |
| Wales | 1.4 W/m²K, or a Window Energy Rating of band B or better | Competent person scheme or building control |
| Scotland | 1.6 W/m²K | No building warrant for a straight replacement; must meet the standards |
| Northern Ireland | 1.6 W/m²K, or a Window Energy Rating of band C or better | No building notice for a straight replacement; must comply |
Full regulations guide, with sources →
Questions about new builds and self-builds
Is triple glazing mandatory for new builds?
No. Neither the current rules nor the Future Homes Standard make it compulsory. Triple glazing helps meet the overall energy target.
Can you price from drawings?
Yes. Send your drawings or window schedule and we will price a package, then confirm sizes on site before manufacture.
Do you supply performance data for SAP?
Yes. Your energy assessor gets the U-values, g-values and frame data for the systems quoted.
How much does a self-build window package cost?
For about 22 m² of windows and doors, our guide starts at £11,195 in uPVC and £18,895 in aluminium, fitted and zero-rated (new home).
Related products
Alu-clad timber windows
From £1,395Warm timber inside, a weatherproof aluminium shell outside.
Learn more →
Passivhaus and EnerPHit
From £1,395Low-energy windows and installation details for certified and near-certified builds.
Learn more →
Fixed and picture windows
From £745Big fixed panes for views, with the weight handled properly.
Learn more →
Bifold doors
From £4,295Folding aluminium doors that open the whole wall, with triple glass.
Learn more →New builds and self-builds by area
England
- Bedfordshire
- Berkshire
- Bristol
- Buckinghamshire
- Cambridgeshire
- Cheshire
- Cornwall
- County Durham
- Cumbria
- Derbyshire
- Devon
- Dorset
- East Riding of Yorkshire
- East Sussex
- Essex
- Gloucestershire
- Greater London
- Greater Manchester
- Hampshire
- Herefordshire
- Hertfordshire
- Isle of Wight
- Kent
- Lancashire
- Leicestershire
- Lincolnshire
- Merseyside
- Norfolk
- North Yorkshire
- Northamptonshire
- Northumberland
- Nottinghamshire
- Oxfordshire
- Rutland
- Shropshire
- Somerset
- South Yorkshire
- Staffordshire
- Suffolk
- Surrey
- Tyne and Wear
- Warwickshire
- West Midlands
- West Sussex
- West Yorkshire
- Wiltshire
- Worcestershire
Scotland
New builds and self-builds: get your guide price
Use the guide-price tool, or book a free survey for a written quote that fixes the price.