How much do new windows cost in 2026?
Last reviewed: July 2026 · Prices are fitted (supply + installation), incl. VAT
The honest answer: for most UK homes, a full set of replacement windows costs somewhere between £2,300 and £6,750 depending on how many windows you have, the frame material, and where you live. Here is how that breaks down — and our calculator will narrow it to your own situation in under a minute.
Price per window, by material
| Frame material | Typical fitted price per window | Best for |
|---|---|---|
| uPVC | £450 – £750 | Value, low maintenance — the UK default |
| Aluminium | £650 – £1,100 | Slim frames, large panes, modern homes |
| Timber | £850 – £1,500 | Period properties, conservation areas |
These bands assume a standard casement window around 1200×1200mm with A-rated double glazing. Sash windows, bays, and bespoke shapes cost more — often 50–100% more for sliding sash designs.
Whole-house examples
| Home | uPVC (fitted) | Aluminium (fitted) |
|---|---|---|
| Flat (3–4 windows) | £1,650 – £2,750 | £2,400 – £4,050 |
| 2-bed terrace (5–6 windows) | £2,300 – £3,850 | £3,350 – £5,650 |
| 3-bed semi (7–9 windows) | £2,700 – £4,500 | £3,900 – £6,600 |
| 4-bed detached (10–12 windows) | £4,050 – £6,750 | £5,850 – £9,900 |
What actually drives the price
- Number of windows — per-window cost falls on bigger jobs as fixed costs are shared.
- Glass specification — A-rated double glazing is standard; triple glazing adds roughly 15–25% (is it worth it?).
- Window style — casements are cheapest; sash, tilt-and-turn and bays cost more.
- Access — upper floors needing scaffold, or tight terraced access, add labour.
- Colour and finish — woodgrain foils and non-white colours add 10–20% on uPVC.
Ways to keep the cost down
- Get at least three quotes. Pricing spread between installers on the same job is routinely 30%+.
- Do the whole house at once if you can — the per-window saving is real.
- Check whether you need replacement at all. Misted glass can often be fixed for £75–£200 per unit — see the repair guide.
- Stay with white uPVC unless the property genuinely calls for something else.
Frequently asked questions
How much does it cost to replace all the windows in a 3-bed house?
For a typical 3-bed semi with 7–9 windows, expect roughly £2,700–£4,500 fitted in uPVC, or £3,900–£6,600 in aluminium. London prices run 15–20% higher; Northern Ireland and much of the North run lower.
Is it cheaper to replace all windows at once?
Yes — installers spread survey, travel and scaffold costs across the job, so the per-window price drops meaningfully (often 10–20%) on whole-house installs compared with doing one or two at a time.
Do replacement windows need Building Regulations approval?
Yes. Replacement windows in England and Wales must meet Approved Document L (U-value 1.4 W/m²K or better) and the work must be certified — most installers self-certify through FENSA or CERTASS, which is why we only introduce certified firms.
How long do uPVC windows last?
Good-quality uPVC windows typically last 20–35 years. If your frames are sound but the glass has misted, you may only need the sealed units replaced — see our repair guide before paying for full replacement.
Sources: price bands compiled July 2026 from published UK installer price guides (Checkatrade, Which?, FMB cost guides) and cross-checked against regional quote data. Energy savings: Energy Saving Trust. Regulations: Approved Document L. Installer certification: FENSA.