How much do new windows and doors cost in the UK?
A uPVC double glazed window costs £400 to £700 supplied and fitted, so all nine windows in a typical three-bed house come to about £3,600 to £6,300. Aluminium, triple glazing, sash and bay windows each cost more, and doors are priced separately. Use the calculator to price your own job by type, number and region, then follow the table for the full guide on any one of them.
| Job | From | Typical | Up to | Priced by |
|---|---|---|---|---|
| Double glazing | £400 | £550 | £900 | per window |
| Triple glazing | £450 | £800 | £1,600 | per window supplied and fitted |
| Secondary glazing | £200 | £375 | £750 | per window |
| Sash window | £250 | £1,200 | £3,000 | per window |
| Bay window | £1,500 | £2,400 | £5,500 | supplied and fitted |
| Velux window | £750 | £1,400 | £2,000 | per window, supplied and fitted |
| uPVC door | £700 | £1,100 | £2,200 | supplied and fitted |
| Composite door | £1,000 | £1,500 | £2,500 | supplied and fitted |
| French doors | £1,100 | £1,800 | £4,000 | supplied and fitted |
| Bifold doors | £2,000 | £4,000 | £9,000 | supplied and fitted |
Window cost calculator
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What each window and door costs
Per unit, supplied and fitted, on Costwise guide prices for the UK average. Each row links to the full guide for that job.
| Window or door | From | Up to |
|---|---|---|
| uPVC window, double glazed | £400 | £700 |
| Aluminium window, double glazed | £550 | £1,050 |
| Triple glazed window | £450 | £1,600 |
| Secondary glazing over an existing window | £200 | £750 |
| uPVC sash window | £850 | £1,600 |
| Timber sash window | £1,200 | £3,000 |
| Roof window or skylight | £750 | £2,000 |
| Bay window | £1,500 | £5,500 |
| uPVC front or back door | £700 | £1,200 |
| Composite front door | £1,000 | £2,500 |
| French doors | £1,100 | £4,000 |
| Bi-fold doors | £2,000 | £9,000 |
What a whole house of windows costs
The same rates multiplied out. A terrace or flat is usually 5 to 7 windows, a three-bed semi 8 to 10, and a larger detached house 12 to 16. Doing the whole house at once is normally priced more keenly per window than a single replacement, so treat these as the top of the range rather than the middle.
| Window type | 5 windows | 9 windows | 14 windows |
|---|---|---|---|
| uPVC window, double glazed | £2,000 to £3,500 | £3,600 to £6,300 | £5,600 to £9,800 |
| Aluminium window, double glazed | £2,800 to £5,300 | £5,000 to £9,500 | £7,700 to £14,500 |
| Triple glazed window | £2,300 to £8,000 | £4,100 to £14,500 | £6,300 to £22,500 |
| Secondary glazing over an existing window | £1,000 to £3,800 | £1,800 to £6,800 | £2,800 to £10,500 |
What changes the price of windows and doors
Material is the biggest lever. uPVC is the cheapest and most common; aluminium and timber cost more for a slimmer or more traditional look. On doors, a uPVC door is the budget option, a composite door costs more but is more secure and better insulated, and bi-fold or French doors are priced by the number of panes.
Size, the glazing spec (double or triple, acoustic or low-E), and the number of openings you do at once all matter, and most firms price a whole-house job more keenly per window than a single replacement. Fitting is a big part of the cost, so buying the units yourself rarely saves as much as it looks.
How a window quote is built up
A per-window price is four things bundled together: the unit itself, the survey and manufacture, the fitting, and taking the old frame away. On a uPVC job the unit is roughly half and the fitting most of the rest, which is why the same window varies by hundreds of pounds between firms without anyone being dishonest about it. A national installer carries a showroom, a sales visit and a finance option in its overhead; a two-person local firm does not.
That is also why a quote that arrives as one number for the whole house is hard to check. Ask for it per window, with the frame material, the glazing spec and the guarantee named, and the comparison becomes possible. Two firms quoting £5,400 and £7,800 for nine windows are not necessarily quoting the same job.
What sits outside the per-window price
Four things are commonly extra and worth asking about before you sign. Scaffolding or a tower for anything above the ground floor on a tight frontage. A new lintel where an opening is being made bigger, which is structural work rather than a window job. Making good the plaster and the sill inside, which some firms include and some leave to you. And the certificate itself, since a registered installer self-certifies the work and issues it, while an unregistered one leaves you to notify building control and pay for the inspection.
Two rules catch people out on replacements rather than new openings. Replacement windows in a habitable room generally need background ventilation, normally trickle vents in the frame, which changed in June 2022 and is the single most common omission from a quote. And the work is building work whether or not anyone inspects it. Both are covered properly on the double glazing and sash window guides.
Whole house or one at a time
Doing every window at once is usually the cheaper route per window, because the survey, the delivery and the setup are charged once rather than nine times, and most firms discount a full-house order. Doing them one at a time spreads the cost and lets you start with the worst, which is the right answer if the money is the constraint rather than the total. What rarely pays is doing half now and half in two years: you pay the setup twice and the second batch has moved in price.
When repairing beats replacing
A misted or blown double glazed unit is usually the glass seal failing, not the window. The sealed unit can be replaced in the existing frame for a fraction of a new window, so a house with sound uPVC frames and two foggy panes does not need nine new windows. The same is true of failed hinges, handles and locks, which are replaceable parts. Replacement earns its money when the frames themselves are distorted, rotten or single glazed, or when you are changing the look.
Explore each cost in detail
Common questions
Replacing every window in a typical three-bed house with uPVC double glazing costs roughly £4,000 to £8,000, or about £400 to £900 per window fitted. Aluminium and timber cost more, and a larger house or bay windows push it up. Doing the whole house at once is usually cheaper per window than one at a time.
A composite door costs more than a uPVC one but is thicker, more secure and better insulated, and it holds its finish longer. If the door is a main entrance or south-facing, most people find the extra worth it; for a back or side door that gets less use and weather, uPVC is fine. Compare the two in the door guides above.
New windows help a sale more than they add a pound-for-pound return: they make a home look cared-for and improve the EPC rating and warmth, which buyers notice. Treat them as maintenance and comfort that also helps a sale, rather than an investment that pays back its full cost.
Replacing a single window costs £400 to £700 supplied and fitted in uPVC double glazing, and more in aluminium, triple glazing or timber. A single replacement sits at the top of that range rather than the middle, because the survey, the delivery and the fitter's day are charged once across one window instead of nine. If you only need one done, ask whether the firm has a minimum charge before you compare quotes.
Yes, per window. A whole-house order spreads the survey, the delivery and the setup across every opening, and most firms discount it, so nine windows together typically costs less per window than nine separate visits. The exception is cash flow: doing the worst two now and the rest later costs more in total but less today. Doing half now and half in a couple of years is the one option that rarely pays, because you meet the setup cost twice and the second batch has moved in price.
In England, usually yes, and it is the most common thing missing from a quote. Replacement windows in a habitable room generally need background ventilation, normally provided by trickle vents in the frame, following a change to the ventilation rules in June 2022. A quote that does not mention them is either assuming your room is ventilated another way or has not accounted for it, so ask. The double glazing guide sets out the requirement in full.
Usually yes, and it is far cheaper. A misted or foggy pane is the sealed unit's seal failing rather than the window failing, and the unit can be swapped in the existing frame for a fraction of a new window: eight firms' own price lists in October 2026 started at £50 to £220 a unit fitted, five of them under £100. If the frames are sound uPVC and only a couple of panes have gone, you do not need new windows. Replacement is the right call when the frames are distorted, rotten or single glazed, or when you are changing the look of the house.
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. The underlying figures are free to download as a CSV under a CC BY 4.0 licence.