How Much Do New Windows Cost in the UK?
Replacing your windows improves warmth, security and kerb appeal. Cost depends on the frame material, the number and size of windows, and whether you are doing the whole house at once.
Typical whole-house uPVC double glazing for a 3-bed semi. Aluminium and timber cost more.
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Cost per window (supplied & fitted)
Whole-house double glazing (uPVC)
What affects the price
- •Frame material — uPVC is cheapest, aluminium mid-range, timber the most expensive.
- •Window style — sash and shaped windows cost far more than standard casements.
- •Glazing spec — triple glazing, acoustic or toughened glass adds cost.
- •Access — upper-floor windows may need scaffolding.
- •Making good plaster and sills after fitting.
Regional price variation
Labour is the biggest regional swing. London and the South East typically run 20–30% above the national average, while the North of England, Scotland and Wales tend to sit 5–15% below it. Material prices are fairly consistent nationwide — it is day rates that move the total. The ranges on this page assume South of England pricing unless stated.
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Frequently asked questions
How much does it cost to replace all the windows in a house?
Full uPVC double glazing costs around £4,000–£9,000 for a typical 3-bed semi, £2,800–£5,000 for a small terrace or flat, and £7,000–£15,000 for a large detached house. Aluminium or timber frames push the total up by 30–60%.
How much is one replacement window?
A single uPVC casement window costs around £400–£750 supplied and fitted. Sash windows are £700–£1,200, aluminium £750–£1,400 and timber £800–£1,600.
Is uPVC or aluminium better value?
uPVC is the best value and most popular choice, typically 30–50% cheaper than aluminium. Aluminium suits slim, modern frames and large glazed areas, and lasts longer, so it can be worth the premium on a contemporary property.