How much does triple glazing cost in the UK?
Triple glazing costs £800 on average in the UK. Most jobs fall between £450 and £1,600 per window supplied and fitted. Window size or type: Small casement £450 to £700; Standard window £650 to £1,000; Large £1,000 to £1,600. Prices reviewed June 2026.
Triple glazing usually costs between £450 and £1,600 per window supplied and fitted in the UK, with most homeowners paying around £800 per window. The price depends mainly on the window size, the frame material and how many windows you replace at once.
Triple glazing cost calculator
Use the calculator to price your triple glazing in 2026. Adjust the options and area for a UK cost range. Nothing is sent anywhere.
To price the whole job, use the double glazing cost calculator.
Triple glazing cost breakdown
The cheapest option is Small casement, up to 60x90cm at £450 to £700, and the dearest is Large, bay or premium frame at £1,000 to £1,600. Typical is £800 per window supplied and fitted.
| Window size or type | Typical UK cost |
|---|---|
| Small casement, up to 60x90cm | £450 to £700 |
| Standard window | £650 to £1,000 |
| Large, bay or premium frame | £1,000 to £1,600 |
What's included in the price?
Typical triple glazing prices include:
- A survey and accurate measurements of each opening
- Three panes of glass with two insulating gas-filled gaps
- The new frames in your chosen material and colour
- Removal and disposal of the old windows
- Fitting, sealing and making good around each frame
- A FENSA or CERTASS certificate for building control
What changes the price?
The things that move triple glazing prices most:
The size and number of windows
The frame material (uPVC, aluminium or timber)
The window style, such as casement, sash or bay
The glass spec and energy rating
Access and whether scaffolding is needed
Your region
How the price is built up
Most of the cost is the sealed triple-glazed unit and the frame, both made to measure for each opening. The rest covers the survey, taking out the old window, fitting and sealing the new one, and the building control certificate. Larger openings, bay windows and aluminium or timber frames push the price up. The glass units and frames make up most of the price; fitting is usually a day rate for a two-person team. On a typical window the materials are the larger share of the cost.
Ways to keep the cost down
- Replace all the windows in one go rather than one or two at a time
- Get three quotes from local FENSA-registered fitters, not just national brands
- Stick to standard casement styles and colours
- Ask whether double glazing with a warm-edge spacer would meet your needs for less
Does where you live change the cost?
In London, triple glazing typically costs around £1,000 per window supplied and fitted, about 30% above the UK average of £800. In the North, Scotland and Wales the guide figure is nearer £740.
| Region | From | Typical | Up to |
|---|---|---|---|
| Midlands / East (UK average) | £450 | £800 | £1,600 |
| London | £590 | £1,000 | £2,100 |
| South East / South West | £520 | £920 | £1,800 |
| North / Scotland / Wales | £410 | £740 | £1,500 |
Guide prices per window supplied and fitted, scaled with the same regional multipliers as the calculator. Not quotes.
Triple glazing cost in major UK cities
| City | From | Typical | Up to |
|---|---|---|---|
| Belfast | £380 | £680 | £1,400 |
| Birmingham | £440 | £780 | £1,600 |
| Bristol | £500 | £880 | £1,800 |
| Cardiff | £420 | £750 | £1,500 |
| Edinburgh | £440 | £780 | £1,600 |
| Glasgow | £410 | £720 | £1,400 |
| Leeds | £420 | £740 | £1,500 |
| Liverpool | £410 | £740 | £1,500 |
| London | £590 | £1,000 | £2,100 |
| Manchester | £430 | £770 | £1,500 |
| Newcastle | £410 | £720 | £1,400 |
| Sheffield | £410 | £740 | £1,500 |
City guide estimates, scaled by local labour costs. Indicative averages for triple glazing, not quotes.
Installers in London and the South East charge the most; the North, Wales, Scotland and Northern Ireland are typically 10 to 20 percent cheaper for the same window.
Common questions
How much does triple glazing cost in 2026?
Around £450 to £1,600 per window supplied and fitted, with most people paying about £800. A typical three-bed house of 8 to 10 windows comes to roughly £6,000 to £10,000.
How much more does triple glazing cost than double glazing?
Expect to pay roughly 20 to 40 percent more than double glazing for the same window, so about £150 to £350 extra on a standard casement. The gap is wider on large or bespoke windows.
Is triple glazing worth it over double glazing?
For most homes good double glazing already cuts heat loss well. Triple glazing helps most in cold or exposed spots, in new builds aiming for low energy bills, or where you want extra noise reduction. On an older house the fuel saving alone rarely pays back the extra cost, so weigh comfort and quiet, not just bills.
Can I fit triple glazing myself?
Fitting replacement windows is not a DIY job for most people. The work needs building control sign-off, and a poor fit causes draughts and leaks. Unless you use a FENSA or CERTASS registered installer, you have to notify building control and pay for an inspection yourself.
How long does triple glazing take to install?
A single window is swapped in a few hours. A full house of 8 to 10 windows takes 2 to 3 days on site, after a 3 to 4 week wait for the made-to-measure frames.
How long does triple glazing last?
Around 20 to 30 years for the sealed units, with uPVC frames commonly put at 20 to 35, so as with double glazing it is the glass rather than the frame that decides when you replace. Most sealed-unit guarantees run to about 10 years, which is a good deal shorter than the expected life and worth reading rather than assuming. The first sign is misting or condensation between the panes, meaning that unit has lost its seal, and the gas fill escaping costs you performance for a while before any misting shows. One point specific to triple: you replace the failed unit rather than the whole window, but a triple unit is heavier and dearer to replace than a double, so factor that in when weighing £450 to £1,600 per window against double glazing. Frames outlasting the glass is the same pattern as double glazing, and the reason a misted window is usually a unit replacement and not a new window.
What is a cheaper alternative to triple glazing?
Secondary glazing, an extra pane fitted inside your existing window, costs far less and cuts draughts and noise, though it insulates less than a full triple-glazed unit. Double glazing with a warm-edge spacer is another middle option.
These are independent guide prices based on typical UK jobs in 2026. Your actual cost depends on your property, spec, access and where you live. Always get at least three written quotes before committing.