Double Glazing Costs 2026
A single uPVC casement runs about £650 fitted in 2026, and a whole average semi sits between £4,000 and £10,000. Here is the full breakdown.
Double glazing is priced per window and then totalled, so the two levers that move your bill most are how many windows you replace and which frame material you choose. The tables below are 2026, fully fitted figures: they include the unit, labour, removal, sealing and the FENSA certificate. We cross-checked these prices across Checkatrade, the FMB and GreenMatch, and they were price-checked by Tom Bradley, a FENSA-registered installer. You can read the full method on our methodology page.
Cost per window by style
Style matters because a vertical sliding sash or a projecting bay is far more work to make and fit than a flat casement. The ranges below are per window, supply and fit, across all three common frame materials. For the casement-by-casement detail, see our guide to cost per window or run the uPVC window calculator.
| Style | uPVC | Aluminium | Timber |
|---|---|---|---|
| Casement | £400–£1,000 | £540–£1,350 | £760–£1,900 |
| Sash | £700–£1,500 | £950–£2,030 | £1,330–£2,850 |
| Tilt & Turn | £500–£1,200 | £680–£1,620 | £950–£2,280 |
| Bay (per bay) | £1,100–£3,000 | £1,490–£4,050 | £2,090–£5,700 |
| Fixed | £220–£440 | £300–£590 | £420–£840 |
| French Doors | £1,100–£2,200 | £1,490–£2,970 | £2,090–£4,180 |
| Bifold Doors | £2,200–£5,500 | £2,970–£7,430 | £4,180–£10,450 |
Casement is the cheapest entry point and the row most homes should price first.
Cost by frame material
uPVC is the baseline. Aluminium buys you slimmer sightlines and a longer life for a 30 to 40% premium, while timber is a period and conservation-area choice that can cost roughly double. The maintenance column is the part buyers forget: only timber needs repainting. To weigh frames directly, read uPVC versus aluminium.
| Material | Per window | Lifespan | Maintenance | Best for |
|---|---|---|---|---|
| uPVC Best Buy | £400-£1,000 | 20-25 yrs | None | Most modern UK homes; best value |
| Aluminium Worth it | £550-£1,300 | 30-40 yrs | None | Slim modern frames, large openings |
| Timber It depends | £900-£2,000 | 30-60 yrs | Repaint every 8-10 yrs | Period and conservation-area homes |
Three more things shift the final figure: where you live, how big your home is, and the glass specification you choose, as triple glazing adds roughly 20 to 30% over A-rated double. Use the links below to drill into whole-house totals, regional differences and glass spec before you ask anyone for a quote.
Cost by House Size
Whole-house totals from a flat to a detached, with typical window counts for each.
Cost by UK Region
How London, Manchester and Birmingham compare against the national average.
Cost by Glass Spec
From single glazing to A-rated double and triple, and what each step adds.
Cost Per Window
The single-window breakdown, including supply-only versus fully fitted.
How to use these figures
Treat every number here as a guide range, not a quote. Real prices move with access, scaffolding, glass spec and installer demand. Once you have a rough total, check it against at least three written quotes, and read how to avoid being overcharged so you can spot an inflated price. If your home is older, the is it worth it guide helps you decide whether to replace now or wait.