Guide
Triple glazing cost guide (October 2026)
Per-window and whole-house guide prices, what changes the price, and how to compare quotes.
On our guide, triple glazed uPVC windows cost £695 to £1,695 each fitted, depending on size, and a 3-bed semi with 9 windows and a front door costs £9,395 to £11,795. Aluminium and timber cost more. UK market figures run from about £400 to £2,000 per uPVC window.
Per window, fitted
| Frame | Small | Medium | Large |
|---|---|---|---|
| uPVC | £695 | £895 | £1,395 |
| Aluminium | £1,095 | £1,495 | £2,295 |
| Timber | £1,295 | £1,795 | £2,695 |
| Alu-clad timber | £1,395 | £1,895 | £2,995 |
Starting points of each guide range, supply and fit, inc VAT. Small is about 600 x 1000 mm, medium about 1200 x 1200 mm, large about 1800 x 1200 mm.
Whole house
- 2-bed terrace, 5 windows and a front door: £5,695 to £7,195
- 3-bed semi, 9 windows and a front door: £9,395 to £11,795
- 4-bed detached, 12 windows, front door and French doors: £13,595 to £16,995
What the market charges
Published UK figures for 2025 and 2026 put triple glazed uPVC windows at about £400 to £1,300 for small windows, £550 to £1,500 for medium and £950 to £2,000 for large, with Checkatrade’s figures at the top of that range. A 3-bed semi typically costs £6,500 to £11,000 for windows only. Our guide prices sit within those ranges.
What pushes the price up
- Colour and woodgrain finishes
- Flush sashes, sashes and tilt and turn openings
- Acoustic or laminated security glass
- Bays that need structural support
- Scaffolding for upper floors that ladders or towers cannot reach
- Making good damaged reveals or replacing rotten sub-cills
How to compare quotes
Ask every installer for the same four things: the unit build-up (for example 4-16-4-16-4 argon, two low-e panes), the whole-window U-value, the frame system, and how Building Regulations sign-off is handled. A cheap triple quote with a thin 28 mm unit is not the same product.
VAT and grants
Replacement windows, doors and glazing in existing homes are standard-rated for VAT at 20%. HMRC’s 0% rate for energy-saving materials (Notice 708/6, which runs to 31 March 2027) does not cover double or triple glazing. Supply and fitting by a VAT-registered contractor in the construction of a new home is normally zero-rated (VAT Notice 708), and 5% can apply to some conversions and to homes empty for two years or more. Grants for triple glazing are rare; see our regulations and funding guide.
Questions
How much is triple glazing per window?
On our guide, £695 to £1,695 for uPVC depending on size, fitted and inc VAT. Aluminium and timber cost more.
Is there VAT on triple glazing?
Yes, 20%. The 0% rate for energy-saving materials does not cover glazing.
Sources
- Checkatrade: triple glazing cost
- BestBuilders: triple glazing cost UK
- less.co.uk: triple glazing cost
- Trade2Base: triple glazing costs
More guides
- Is triple glazing worth it?
- Triple vs double glazing: the real differences
- U-values and Window Energy Ratings explained
- Building Regulations for replacement windows: England, Wales, Scotland and Northern Ireland
- Do you need planning permission for new windows?
- Triple glazing and condensation
- Does triple glazing reduce noise?
- Can you put triple glazing in existing frames?
- Triple glazing in period homes and conservation areas
- Trickle vents and ventilation when replacing windows
- Window security: locks, laminated glass and PAS 24
- Windows for Passivhaus and EnerPHit projects
- uPVC vs aluminium vs timber vs alu-clad: choosing a frame
- Triple glazing and solar gain: which way do your windows face?
- What happens when your triple glazing is installed
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