Replacement windows · by type of home
Replacement windows for a detached house
Replacement windows for a detached house take longer and cost more than for a semi, because there are more windows, bigger windows and more exposed sides, so scaffolding is more likely. The cost per window is often lower on a bigger order, but the total is the highest of the four home types.
Are replacement windows for a detached house right for your home?
Suits
- Detached family homes with ten or more windows
- Owners who want every window done once, in a single consistent style
- Houses with large rear and side windows that need careful sizing
Good points
- A larger order can lower the price per window
- A single fitting team keeps the finish consistent
- Detached walls make it easy to work from all four sides
Watch out for
- The total is the highest of the four home types
- Scaffolding on several sides adds to the bill
- More windows means more to check at handover
What replacement windows for a detached house cost
Replacement windows for a detached house typically cost £7,100 (4-bed detached house, twelve uPVC casement windows, fitted), with most jobs between £5,500 and £9,000. That includes VAT at 20%. Fitting takes 2–4 days on site.
What you would actually pay
Typical 4-bed detached house, twelve uPVC casement windows, fitted · UK- Typical installed cost Replacement windows for a detached house, supplied and fitted
- £5,917
- VAT at 20% Standard rate
- £1,183
- Net cost to you
- £7,100
If you borrowed £7,100.00 over 36 months at 0.0%, it would cost £197.22 a month – £7,100.00 in total, of which £0.00 is interest. The last payment would be £197.30.
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 replacement windows for a detached house
| Element | Typical range |
|---|---|
| Windows, made to measure Twelve double glazed units in a white uPVC profile, with standard locks and handles. | £3,400 – £6,000 |
| Fitting Two fitters taking out the old frames and fixing, packing and sealing the new ones over three or four days. | £1,400 – £3,000 |
| Removal and disposal Taking away the old frames, usually by skip because of the volume. | £200 – £360 |
| Scaffolding or towers Upper windows on more than one side may need scaffolding, which is charged per side of the house. | £0 – £1,200 |
| Making good Plastering and painting the reveals inside. Often included, sometimes not, and it grows with the number of windows. | £0 – £1,200 |
Guide prices including VAT. Your actual cost depends on your home, access and specification.
What moves the price of replacement windows for a detached house
- Number and size of windows
Large rear and side windows are made to measure and priced by size, so a few big openings can matter more than several small ones.
- Scaffolding
A detached house has four sides, and upper windows on each may need to be reached safely. The more sides, the higher the access bill.
- Style and finish
Plain white casements set the base price. Coloured foils, Georgian bars and sliding sash or bay windows all add to it.
- Glass
Standard double glazing is included. Triple glazing, acoustic glass and toughened safety glass cost extra, and are most often added to the busiest elevation.
- Who fits them
A large job is worth several quotes. Compare the profile, glass and guarantee, not only the total.
What should be in a quote for replacement windows for a detached house
If a quote is missing any of these, ask why before you compare it with another.
- The number of windows, each one's size and style, and which panes open
- The frame profile or brand, its colour inside and out, and the guarantee on frames and glass
- The glass: its energy rating or U-value, whether it is toughened where it needs to be, and any obscure panes
- Removal and disposal of the old windows and frames, and whether scaffolding is included
- Making good the plaster and reveals inside, and new sills and trims
- FENSA or CERTASS registration, so the work is certified under Building Regulations
- Whether the guarantee is insurance-backed, and what deposit is asked for
Replacement windows for a detached house prices by region
Labour is most of the difference. Typical price (4-bed detached house, twelve uPVC casement windows, fitted), including VAT.
| Region | Typical | vs UK average |
|---|---|---|
| London | £8,900 | +25% |
| South East | £8,300 | +17% |
| South West | £7,800 | +10% |
| East of England | £7,500 | +6% |
| West Midlands | £7,400 | +4% |
| Scotland | £7,200 | +2% |
| East Midlands | £7,100 | UK average |
| Yorkshire and the Humber | £7,100 | UK average |
| North West | £6,900 | −2% |
| North East | £6,700 | −5% |
| Wales | £6,700 | −6% |
| Northern Ireland | £6,200 | −12% |
Common questions
How many windows does a 4-bed detached house have?
Between ten and fifteen is typical, depending on the number of bays and large picture windows. Count yours and tell each installer the number, so the quotes can be compared.
How long does a whole-house job take?
Two to four days is usual for two fitters, longer if scaffolding must go up first or if some openings need structural work.
Can I replace the windows in stages?
Yes, but each visit carries its own fixed costs. Doing the whole house at once is usually cheaper per window, so ask for a quote for both.
Where the replacement windows for a detached house prices come from
We store each price without VAT and add it back for display. These are the published guides behind the figures:
- MyJobQuote, uPVC windows cost, 9 July 2026: whole-house estimates, fitted; VAT treatment not stated, so treated as VAT-inclusive and divided by 1.2 to store ex-VAT
- BestBuilders, double glazing cost UK, Q3 2026: whole-house table, fitted, VAT stated as included (divided by 1.2 to store ex-VAT)
- ExpertSure, window costs UK, prices verified October 2026: supply and fit, VAT stated as included (divided by 1.2 to store ex-VAT)
- 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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