Window Replacement Costs UK 2026: Per-Window and Whole-House Prices

Quick answer: A fitted uPVC casement window typically costs £400–£600 at mid-2026 prices, and replacing every window in an average UK home comes to £5,530 on our modelled estimate, with a typical range of £3,595–£8,572. Aluminium or timber frames, sash styles and triple glazing can roughly double the per-window price.

Window prices are quoted so inconsistently — per window, per house, supply-only, fitted — that comparing quotes is half the battle. Below are per-window market prices from trade cost guides checked in July 2026, followed by our own modelled whole-house estimates for all twelve UK regions.

What a single window costs in 2026

Sources: MyJobQuote window cost guide (updated 9 July 2026) · checked July 2026.

Labour usually accounts for £100–£150 of a single window swap, and whole-house jobs are priced around two fitters at £200–£350 each per day, according to the same MyJobQuote guide. Sash and bay windows carry the biggest premiums, and anything needing scaffolding adds more.

How many windows are you actually buying?

Whole-house quotes hinge on window count, and most homeowners overestimate how many they have. A one-bed flat typically has 4–6 windows, a mid-terrace 6–8, a three-bed semi 8–10 and a four-bed detached 12–15. Using MyJobQuote’s materials-plus-labour breakdowns, four uPVC casements come to roughly £1,750–£1,950 installed, eight to £3,150–£3,600, ten to £3,750–£4,200 and fifteen to £5,700–£6,300 — broadly in line with MyJobQuote’s £4,000–£6,000 range for a three-bed semi. Fitters usually work in pairs and clear a full house in one to three days.

Count your windows before you get quotes, and note which are standard casements and which are bays, sash styles or oversized panes — those are the lines that inflate an itemised quote.

Whole-house costs: our modelled estimate for every UK region

Our modelled estimate for a typical whole-house double glazing replacement is £5,530 at the national mid-point, with a typical range of £3,595 to £8,572 depending on window count, frame material and glazing spec (see how we calculate costs). Regional labour and material prices shift that mid-point as follows:

Home Energy Quotes Cost Index, July 2026 — modelled estimates rounded to the nearest £10. Apply the same ×0.65 to ×1.55 range to your region’s mid-point for a realistic quote band.

Market guides broadly agree with the model. MyJobQuote puts a three-bedroom house at £4,000–£6,000, while Restoration Glazing’s 2026 price guide quotes £3,000–£6,000 for a three-bed semi and £5,000–£9,500 for a four-bed detached. Premium aluminium or hardwood jobs can land well above every figure here.

What moves a window quote up or down

• Frame material — the single biggest lever. Our uPVC vs aluminium vs timber comparison shows aluminium and timber costing roughly 1.5–3 times uPVC money.
• Window style — sash windows cost around double an equivalent casement; bays cost more again.
• Glazing spec — triple glazing adds £100–£300 per window, and a higher BFRC energy rating band generally costs more.
• Access — upper floors that need scaffolding, awkward openings and conservation-area conditions all add labour.
• Paperwork — replacement windows are notifiable work and must hit a 1.4 W/m²K U-value or band B; our FENSA guide explains the sign-off routes.

One check before you commit: if your frames are sound and only the glass has fogged, you may not need new windows at all. Replacing just the failed sealed units costs a fraction of these figures — see our guide to misted double glazing.

Will new windows pay for themselves?

Not quickly, on bills alone. Our modelled estimate puts double glazing savings at up to £279 a year (estimate), calculated at the July–September 2026 Ofgem price cap rates of 26.11p/kWh for electricity and 7.33p/kWh for gas. Against a £5,530 mid-point installation, that is a payback measured in decades — so treat replacement windows as a comfort, noise, condensation and EPC upgrade that also trims bills, not a pure investment. The everyday gains are real, though: noticeably less street noise, warmer surfaces next to the glass, and far less condensation on cold mornings.

If the budget will not stretch, secondary glazing delivers much of the thermal benefit for less, and window film is cheaper still. To model your own home, try our savings calculator or start with the double glazing guide.

FAQs

How much does one replacement window cost in the UK?

A fitted uPVC casement runs £250–£800 depending on size at mid-2026 prices. Sash styles, aluminium and timber frames cost more — anywhere from £500 to £2,800 per window.

How much does it cost to replace all the windows in a 3-bed house?

Our modelled estimate is £5,530 at the national mid-point (typical range £3,595–£8,572). Market cost guides quote £3,000–£6,400 for a standard uPVC job on a three-bed home, with premium frames costing more.

Is there VAT relief on new windows?

No. The 0% VAT relief on energy-saving materials (running to March 2027) covers insulation, solar, batteries and heat pumps — not glazing. Window quotes should state that 20% VAT is included.