Cost to replace all windows
Replacing every window in a house at once is a major project, but it usually earns a better per-window rate than doing them piecemeal. The total depends on how many windows you have, the material and style, and how easy they are to reach. Below are typical UK whole-house totals by property size, with worked examples — all guidance ranges confirmed only on a home survey.
Typical whole-house totals (uPVC)
Using typical uPVC casement pricing, whole-house totals tend to fall in these ranges:
- Flat / small home (4–6 windows): around £2,000–£3,500
- Two-bed terrace (7–9 windows): around £3,000–£5,000
- Three-bed semi (9–12 windows): around £4,500–£7,500
- Four-bed detached (12–16 windows): around £7,000–£12,000+
Choosing aluminium or timber will lift these totals substantially. Compare the materials in our window prices by material guide before you budget.
A worked example
Take a three-bed semi with ten windows — say six standard casements, two larger casements and a bay. At typical uPVC pricing, the standard casements might total around £3,000, the larger units another £1,300, and the bay £1,500, giving roughly £5,800 before any whole-house discount. Order everything together and the installer only scaffolds and makes good once, so the per-window rate — and the total — usually comes down.
What changes the total
Beyond the number of windows, the total shifts with style (bays and sashes cost more than casements), glazing spec, upper-floor access and your region. Our guides to window prices by type and what affects window prices break these down, and the full picture lives in our window price guide.
Frequently asked questions
How much does it cost to replace all the windows in a house?
As a typical guide, a two-bed terrace in uPVC runs from around £3,000 to £5,000, a three-bed semi from around £4,500 to £7,500, and a larger detached home from around £7,000 to £12,000 or more. Aluminium and timber cost more, and your exact total is confirmed on a home survey.
Is it cheaper to replace all windows at once?
Usually, yes. A whole-house order earns a better per-window rate than replacing units one at a time, because the installer only mobilises, scaffolds and makes good once. The total outlay is larger, but the cost per window is typically lower.
How many windows does an average UK house have?
A typical two- or three-bedroom UK home has between 8 and 12 windows. Flats often have fewer, while larger detached properties can have 15 or more, which is why whole-house totals vary so widely.
Are the whole-house prices on this page guaranteed?
No. Every figure is a typical range to help you budget. A firm price can only be given after an installer surveys your home, counts the openings and confirms the material and glazing you want.
