Single replacement window
A single replacement window is the cleanest way to test a quote. Whatever the size of the job, every firm's price comes down to what it charges for one standard window, fitted, so a written figure for one window shows quickly whether a whole-house quote is in the right place.
Is a single replacement window right for your home?
Suits
- Anyone replacing one broken, rotten or draughty window rather than the whole house
- Homeowners checking the per-window rate hidden inside a larger quote
- Owners of a house with one window that has to match the rest
Good points
- A simple job that is easy to compare line by line between firms
- The old frame goes, so the problem is cured rather than patched
- One window can usually be done in a single visit
Watch out for
- A single window costs more each than the same window in a whole-house order
- Some firms will not take a one-window job, or add a minimum charge
- A made-to-measure window has to be ordered, so the fitting is rarely on the day you ask
What a single replacement window costs
A single replacement window typically costs £510 (one standard white uPVC casement window, supplied, fitted and the old one removed), with most jobs between £350 and £700. That includes VAT at 20%. Fitting takes 1–2 hours on site.
What you would actually pay
Typical one standard white uPVC casement window, supplied, fitted and the old one removed · UK- Typical installed cost Single replacement window, supplied and fitted
- £425
- VAT at 20% Standard rate
- £85
- Net cost to you
- £510
If you borrowed £510.00 over 36 months at 0.0%, it would cost £14.17 a month – £510.00 in total, of which £0.00 is interest. The last payment would be £14.05.
Illustration only – not a quote, not an offer of credit, and not financial advice. Rates depend on your circumstances and creditworthiness.
Where the money goes on single replacement window
| Element | Typical range |
|---|---|
| The window, made to measure A double glazed uPVC casement in a white standard profile, with locks and handles, before any fitting. | £150 – £400 |
| Fitting Removing the old frame and fixing, packing and sealing the new one. This is the figure that varies most between firms. | £100 – £400 |
| Making good inside Plastering and decorating the reveal where the old frame came out. Many firms leave the painting to you. | £50 – £100 |
| Sills and trims A new sill and internal trims, only where the old ones are damaged or the wrong size for the new frame. | £50 – £100 |
| Scaffolding Only where an upstairs window cannot be reached safely from a ladder or from inside. It is charged per side of the house, so it weighs heavily on a one-window job. | £300 – £800 |
Guide prices including VAT. Your actual cost depends on your home, access and specification.
What moves the price of single replacement window
- Size of the window
Every window is made to measure. A large pane or a wide opening costs more in glass and in frame, and may need two people to lift.
- Style and number of openers
A fixed pane is the cheapest. Each opening sash adds hinges, locks and seals, and a tilt and turn mechanism adds more.
- Colour and finish
White is the base price. Coloured and woodgrain finishes cost more, and more again when the colour is on both sides.
- Access
A window on the ground floor is straightforward. One that needs scaffolding can cost as much to reach as to replace.
- The state of the opening
Rotten timber, a failed lintel or crumbling brick is usually found only when the old frame comes out, and has to be put right before the new one goes in.
- Who fits it
A local FENSA or CERTASS installer will usually quote well below a national brand for the same kind of frame. Compare on profile, glass and guarantee.
What should be in a quote for single replacement window
If a quote is missing any of these, ask why before you compare it with another.
- The exact size of the opening, the style of the window and which panes open
- The frame make and colour, inside and outside, and the guarantee on frames and glass
- The glass specification, including whether it is toughened where the rules say it must be
- Removal and disposal of the old window, and the making good of the plaster and reveal inside
- New sills and trims, if the old ones are damaged or the wrong size
- FENSA or CERTASS registration, and who applies for the certificate
- The deposit asked for, and whether the guarantee is insurance-backed
Single replacement window prices by region
Labour is most of the difference. Typical price (one standard white uPVC casement window, supplied, fitted and the old one removed), including VAT.
| Region | Typical | vs UK average |
|---|---|---|
| London | £640 | +25% |
| South East | £600 | +17% |
| South West | £560 | +10% |
| East of England | £540 | +6% |
| West Midlands | £530 | +4% |
| Scotland | £520 | +2% |
| East Midlands | £510 | UK average |
| Yorkshire and the Humber | £510 | UK average |
| North West | £500 | −2% |
| North East | £480 | −5% |
| Wales | £480 | −6% |
| Northern Ireland | £450 | −12% |
Common questions
Why does one window cost more than the same window in a whole-house order?
The fitters make the same journey and set up the same tools whether they fit one window or ten. On a single window that fixed effort is spread over one price, which is why firms often add a minimum charge or quote more for a lone window.
Can I just replace the glass instead?
If the frame is sound and only the sealed unit has failed, yes, and it is much cheaper. Our page on replacing a sealed unit shows what that job costs, and the guide on repair or replace helps you choose.
Will I get a certificate for one window?
Ask before you agree the price. A registered installer should tell you how the work will be certified and give you the certificate to keep, even for one window. It matters when you sell, and it is one of the lines a quote should state.
Is a very low quote for one window a good sign?
Not on its own. Check that removal of the old frame, making good, a new sill, the certificate and VAT are all included, because leaving one of them out is the commonest way a quote looks cheaper than it is.
Where the single replacement window prices come from
We store each price without VAT and add it back for display. These are the published guides behind the figures:
- BestBuilders, double glazing cost UK, 2026: standard uPVC casement (1200 x 1200 mm) supply and fit, including removal of the old window, VAT stated as included (divided by 1.2 to store ex-VAT)
- MyJobQuote, double glazed windows cost, last updated 9 July 2026: standard uPVC casement fully installed, supply-only price and fitting, making good and scaffolding rows; VAT treatment not stated, so treated as VAT-inclusive and divided by 1.2 to store ex-VAT
- ExpertSure, double glazing cost, prices verified October 2026: uPVC casement fitted, VAT stated as included; its figures are built on MyJobQuote and Checkatrade, so it is a cross-check only and is not used in the range. Also the source of the sill, trim and a day's-work figures (a fitter's day covers four to six windows)
- HMRC VAT Notice 708/6: glazing is not an energy-saving material, so the standard rate applies
Get quotes for your home
A guide price only takes you so far. Local firms can price the work on your own home, and comparing a few quotes is the quickest way to see what is reasonable.
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