What Does Window Replacement Cost in the UK?
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By house size
| House | Windows | Estimated cost fitted, inc VAT |
|---|---|---|
| Mid-terrace | 6 | £5,090 – £9,254 |
| Semi-detached | 8 | £6,774 – £12,317 |
| Detached | 12 | £9,702 – £17,640 |
By window size
| Size | Typical opening | Supply and fit, inc VAT |
|---|---|---|
| Small | 600 x 900 — WC, landing, porch | £530 |
| Standard | 1200 x 1200 — most bedroom and lounge windows | £745 |
| Large | 1800 x 1350 — front lounge, patio-side | £1,085 |
| Extra large | Picture windows and wide mullioned units | £1,489 |
Why the range is this wide
It is not uncertainty about the work. It is which company quotes it. The same eight windows, to the same specification, came to about 0.88× our base figure at the keener of two national installers whose settled prices we compared, and about 1.6× at the other — and higher again if you accept the first number on the table.
That is the single biggest variable in what you will pay, and it has nothing to do with your house. It is why the estimate here is a range rather than one confident figure, and why it is worth getting more than one quote even when the first one sounds reasonable.
Example: replacing the windows on a 3-bed semi
Eight windows — two large downstairs, the rest standard bedroom and landing sizes — comes to £6,774 to £12,317 fitted, inc VAT, taking out and taking away the old frames.
If some of them are bays, or you choose sash, flush casement or aluminium, it moves up from there; colour moves it least.
What is included in these prices
Supplying and fitting the new windows, taking out and taking away the old ones, and sealing and making good around each new frame. VAT is in every figure.
Access for upstairs windows is included where the estimate needs it (£936 a job for a scaffold tower), and small jobs carry a minimum charge of £970. Not included: new sills or lintels where the old ones have failed, internal decorating, and anything structural.
How these prices compare with other UK guides
Published guides often come in lower. Checkatrade’s window cost guide (last updated July 2026) puts a standard 1,200 × 1,200 mm uPVC casement at £450–£550 plus VAT, about £540–£660 with VAT, and a 3-bedroom house with 12 windows at £5,000–£10,000 plus VAT.
Our figure for the same standard window is about £745 including VAT, for the window itself, fitted, as part of a larger job. It is built from what these jobs typically settle at with established installers. Our estimates then add taking the old frames away, making good and, where needed, access for upstairs windows, which is why the table above, and our £847 to £1,540 a window on an eight-window job, work out at more per window than this. A smaller local firm may quote less than our range; some national companies quote at the top of it.
Whichever figure you use, compare quotes like for like: check each one says whether removal, access, making good and VAT are included.
Planning estimate or quotation?
Every figure on this page is a planning estimate: what a job like this typically costs, for budgeting and for judging the quotes you get. It is not a quotation. A quotation comes from an installer after a survey, when the exact sizes, specification and condition of your house are known.
Facet Pro narrows the estimate to your own house from a photograph of the front — the windows it can see, the wall it can measure against your front door — and says which parts are measured and which are estimated for your house type. Your installer confirms the figure on survey.
Common questions
How much does it cost to replace all the windows in a house?
For a typical eight-window semi, £6,774 to £12,317 fitted, inc VAT. A terrace is less, a detached house more — see the table above.
Is it cheaper to replace windows all at once?
Usually per window, yes: access, travel and setting up are paid once rather than several times. Replacing one or two at a time also carries a minimum charge each visit.
How long does window replacement take?
An average house is typically one to two days for a fitting team, depending on the number of windows and how many are upstairs.
Facet Pro is in early access. We are starting to check how we measure wall area from a photograph against surveyed properties, so treat wall and roof figures as indicative and window figures as a guide.
Your house isn’t average.
See this project on your own home and get a planning estimate. Any figure on this page is for a typical house. Start with one photograph of the front and we will find your windows, doors, roof and walls, estimate your wall area, and price your own elevation.
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These are planning estimates — not a quotation, and not a survey. Windows and doors: what these jobs typically sell for, from 25 years in the home improvement industry, checked against current UK prices. Render, roof and roofline: UK material and labour rates, with scaffolding, waste and VAT. What you pay depends on your own house and, more than anything else, on which company quotes it. Your installer confirms the figure on survey. Prices checked October 2026.