Double glazing cost per window in 2026
The short answer
- £500 to £1,250 for a standard uPVC casement window, supplied and fitted; £700 to £1,500 for a sash
- Timber frames at least 50% more than uPVC; aluminium about 46% more
- Triple glazing around 20% more than double: about £600 to £1,500 a uPVC casement
A double glazed window typically costs £500 to £1,250 supplied and fitted for a standard white uPVC casement, according to Checkatrade, and £700 to £1,500 for a sash window. Timber frames cost at least 50% more than uPVC, and triple glazing around 20% more than double. Prices are typical ranges, not quotes.
Double glazing cost per window by style
£500 to £1,250 for a standard uPVC casement window, more for sash, bay and bow windows.
| Window | Typical range, supplied and fitted | Average |
|---|---|---|
| uPVC casement window | £500 to £1,250 | £1,000 |
| Sash window | £700 to £1,500 | £1,200 |
| Sliding window | £600 to £1,400 | £1,100 |
| Tilt and turn window | £600 to £1,400 | £1,100 |
| Bay window | £1,100 to £4,000 | £2,500 |
| Bow window | £1,500 to £5,000 or more | £3,000 |
Read the detail
A standard white uPVC casement window costs about £500 to £1,250 supplied and fitted, with an average of £1,000, according to Checkatrade's May 2026 price guide. Sash, sliding and tilt and turn windows cost a little more, and a bay or bow window averages 2.5 to 3 times as much.
Checkatrade ballpark prices, updated May 2026, for double glazed windows supplied and fitted, which it says are checked by estimators who are members of the Chartered Institute of Building and the Royal Institution of Chartered Surveyors. Prices vary by region and by job, so treat these as typical, not quotes.
Our double glazing cost guide covers the whole house, secondary glazing and the planning rules.
By frame material: uPVC, aluminium and timber
uPVC is cheapest; timber at least 50% more, aluminium about 46% more.
| Frame | What Checkatrade publishes | Against uPVC |
|---|---|---|
| uPVC | £500 to £1,250 for a casement window (May 2026) | Usually the most affordable frame |
| Timber | Around £925 for a small casement window, 600 by 900mm, supplied and fitted (May 2026) | At least 50% more than uPVC |
| Aluminium | £350 to £600, against £250 to £400 for uPVC in the same table (prices dated May 2024) | About 46% more than uPVC, on the averages of £475 and £325 |
| Steel | £1,200 to £2,500 depending on the style (May 2026) | More expensive than the other frames |
Read the detail
uPVC is the cheapest frame. Timber costs at least 50% more, Checkatrade says, and aluminium about 46% more on the prices it publishes side by side; steel is dearer still.
Checkatrade, read 5 October 2026. The uPVC, timber and steel figures are from its double glazing cost guide, updated May 2026. The aluminium figures are from its separate aluminium windows guide, whose price table is dated May 2024 and is on a lower base (it puts uPVC at £250 to £400), so we use it only for the gap between aluminium and uPVC, not as a current price. We found no current published price for aluminium or timber on the same basis as the uPVC one.
Applying Checkatrade's "at least 50% more" to its uPVC casement range puts a timber casement at about £750 to £1,875 or more. That is our arithmetic, not a published price. Coloured aluminium costs around 10 to 20% more than the standard finish, Checkatrade says.
Price is not the only difference. Checkatrade notes that timber can last a lifetime if it is well maintained and suits period homes, that aluminium is slimmer and needs little upkeep, and that uPVC will not last as long as wood.
Double vs triple glazing
Around 20% more for triple glazing: about £600 to £1,500 for a uPVC casement.
| Window | Double glazed | Triple glazed, at 20% more |
|---|---|---|
| uPVC casement window | £500 to £1,250 | £600 to £1,500 |
| Sash window | £700 to £1,500 | £840 to £1,800 |
| Sliding window | £600 to £1,400 | £720 to £1,680 |
| Tilt and turn window | £600 to £1,400 | £720 to £1,680 |
| Bay window | £1,100 to £4,000 | £1,320 to £4,800 |
| Bow window | £1,500 to £5,000 or more | £1,800 to £6,000 or more |
Read the detail
Triple glazing costs around 20% more than double glazing, according to the Energy Saving Trust. On a uPVC casement window that is about £600 to £1,500 against £500 to £1,250.
The triple glazed column is our arithmetic: Checkatrade's double glazed range with the Energy Saving Trust's "around 20% more" applied. It is not a published price for a triple glazed window, and a quote may differ.
The Trust says the energy, sound and security benefits can make triple glazing worth it in a particularly cold or noisy place. We have no sourced figure for the extra energy triple glazing saves over double, so we give no payback for the extra cost.
What changes the price
Style and frame first, then access and the state of the opening.
| What | How it moves the price |
|---|---|
| Number of windows | Each one adds materials and labour |
| Style | Bay, bow and sash windows are larger or more complex than a casement |
| Frame material | uPVC is usually the cheapest; timber and steel cost significantly more |
| Glazing upgrades | Triple, laminated, frosted, acoustic or low-emissivity glass all add to the price |
| Colour and finish | Anthracite grey, chartwell green and wood-effect finishes cost more than white uPVC |
| Upstairs access | Scaffolding hire is around £1,000 a week |
| Labour and location | Installers charge around £25 to £35 an hour, or about £600 a day for two; more in London and the South East |
| The opening itself | Older homes, awkward openings and damaged brickwork add labour time |
Read the detail
The style and the frame move the price most, then access and the state of the opening. Two homes with the same number of bedrooms can get very different quotes, Checkatrade says.
Checkatrade, double glazing cost guide, updated May 2026. Its guide lists these as the main things that affect a quote.
Budget separately for what a quote may leave out: scaffolding, plaster repairs around the opening, redecorating, new sills or window boards, and trickle vents.
From one window to a whole house
About £8,000 to £12,000 for 8 to 12 uPVC casement windows; Checkatrade puts a 3 bed house at £8,000 to £15,000.
Read the detail
At Checkatrade's average of £1,000 for a uPVC casement, the 8 to 12 windows of a typical 3 bed house come to about £8,000 to £12,000; that sum is ours. Checkatrade's own figure for the house is £8,000 to £15,000, and it says the job usually takes 2 to 4 days.
The Energy Saving Trust gives a lower figure, around £4,800 for a set of A-rated windows for a semi-detached house. The two are not like for like, so get three quotes for your own windows, as the Trust recommends.
What a quote should include
Removal, supply and fitting, making good, waste removal and VAT, from a FENSA or CERTASS registered installer.
Read the detail
Removing the old windows, supplying and fitting the new ones, standard glazing and handles, labour, basic making good around the frames, waste removal and VAT are what most quotes include, according to Checkatrade. Some also include the certificate, a guarantee, trickle vents and upgraded locks.
Check the installer is registered with a competent person scheme such as FENSA or CERTASS, which shows the work meets building regulations, and that the quotes you compare have the same glazing, the same number of opening windows and the same finishing work.
Does it pay back?
Not on energy alone: about £85 a year for a whole semi. Comfort and noise are the real reasons.
Read the detail
Not on the energy saving alone. Replacing all the single glazing in a semi-detached house with A-rated double glazing saves about £85 a year, according to the Energy Saving Trust, against around £4,800 for the windows: about 56 years to pay back, longer than the 20 to 35 years the Trust says double glazing lasts.
The Trust publishes no saving per window, and none for replacing old double glazing with new, so we give neither. People buy new windows for comfort, noise, condensation and security as much as for the bill: our guide to whether double glazing is worth it sets out when it makes sense.
Frequently asked questions
How much does one double glazed window cost?
About £500 to £1,250 for a standard white uPVC casement window, supplied and fitted, with an average of £1,000, according to Checkatrade's May 2026 guide.
Are aluminium windows more expensive than uPVC?
Yes. In the table Checkatrade publishes for both, aluminium averages £475 against £325 for uPVC, about 46% more. Those prices are dated May 2024, so use the gap, not the figures.
How much more do timber windows cost?
At least 50% more than uPVC, Checkatrade says. It puts a small timber casement window, 600 by 900mm, at around £925 supplied and fitted.
How much more is triple glazing than double glazing?
Around 20% more, according to the Energy Saving Trust: about £600 to £1,500 for a uPVC casement window on Checkatrade's double glazed range, by our arithmetic.
How much does a bay window cost to double glaze?
About £1,100 to £4,000, with an average of £2,500, and a bow window £1,500 to £5,000 or more, in Checkatrade's May 2026 guide.
Data sources
Checkatrade for prices and the Energy Saving Trust for the triple glazing premium and the saving.
Show every source
- Checkatrade, Double glazing cost (updated May 2026): ballpark prices per double glazed window and for a 3 bed house, checked 5 October 2026.
- Checkatrade, How much do aluminium windows cost? (updated October 2025, price table dated May 2024): aluminium and uPVC window prices in one table, used here only to compare the two. Read 5 October 2026.
- Energy Saving Trust, Energy efficient windows and doors (last updated 20 May 2026): £4,800 for a set of A-rated windows for a semi-detached house, £85 a year saved replacing single glazing, triple glazing around 20% dearer, a life of 20 to 35 years. Checked 5 October 2026.