How Much Do Casement Windows Cost in 2026?
Check what new windows should cost, then get free quotes from local installers.
Your Estimate
£4,000 – £10,000- Supply only, you arrange fitting−£3,450
- Upgrade to triple glazing+£1,200
- Switch to aluminium frames+£2,450
- Switch to timber frames+£6,300
Now find out what yours actually costs
Installers covering your postcode will quote for your real windows, so you have something to check the benchmark against.
Get quotes for my 10 windowsPrices are estimates based on UK market averages for 2026. Actual costs vary by supplier, location and property. Always get 3 quotes before committing.
What a casement window costs in 2026
A casement is the most common window in the UK: a frame hinged at the side or top that swings outward, with no moving sash to slide and nothing projecting from the wall. Because it is the simplest style to make and the quickest to fit, it is also the cheapest. The calculator above defaults to a uPVC casement, so the figure you see is the casement price straight away. A uPVC casement costs £400 to £1,000 fully fitted in 2026, with a typical figure of around £650. Step up to aluminium and you add roughly 30 to 40%; step up to timber and you add roughly 60 to 110% for the same opening. These figures are cross-checked against Checkatrade, the FMB and GreenMatch.
Casement pricing is the benchmark every other style is measured against, which is why our wider cost per window guide uses it as the baseline. If you want the full picture of how style and material interact before you commit, the master double glazing costs page sets the casement row against sashes, bays and the rest, and our casement versus sash comparison weighs the two most common styles directly.
| Casement window | uPVC | Aluminium | Timber |
|---|---|---|---|
| Per window, fitted | £400–£1,000 | £540–£1,350 | £760–£1,900 |
| Typical | ~£650 | ~£880 | ~£1,250 |
Source: DGCC 2026 consensus (uPVC casement, Checkatrade/FMB/GreenMatch); aluminium +35% and timber +90% as applied across the site. uPVC casement is the value pick.
Which frame material suits a casement
For most homes the answer is uPVC, and it is not close on cost. At around £650 fitted it is the cheapest A-rated frame, needs no upkeep beyond an occasional seal check and lasts 20 to 25 years. Aluminium earns its 30 to 40% premium where you want slim sightlines on a large opening or a modern look, which the aluminium window calculator will price for you. Timber is a period and conservation choice that costs roughly double; the timber window calculator runs those sums. If your home has vertical sliding windows rather than hinged ones, price them in the sash window calculator instead.
The verdict on casement windows
A casement is the default for a reason. It is the cheapest style, it suits the large majority of UK properties, and in A-rated uPVC it is the single best-value window you can buy in 2026, which is why it heads our double glazing best buys for the year, taking the top slot in Double Glazing Best Buys 2026.
Best Buy uPVC A-rated casement: Best Buy. The sensible default for most homes.
Nine out of ten quotes we check are for casements, and for good reason. A decent A-rated uPVC casement does everything most houses need at the lowest price on the board. Do not let a salesperson talk you up to aluminium or timber unless the look genuinely matters on that elevation, because on cost alone the casement wins every time.
Double Glazing Cost Calculator Team
Frequently asked questions
A uPVC casement window costs £400 to £1,000 fully fitted in 2026, with a typical figure of around £650. Aluminium casements run roughly 30 to 40% higher and timber casements roughly 60 to 110% higher for the same opening.
A casement is a simple hinged frame with no sliding sashes, balances or projecting structure, so there is less to manufacture and it is quick to fit. That simplicity is why it is the lowest-priced style and the row most homes should price first.
Yes. An A-rated uPVC casement at around £650 fitted is our Best Buy for 2026: it is the cheapest A-rated entry point, lasts 20 to 25 years, meets Part L and is easy for any FENSA-registered installer to fit.
A flush casement sits flat within the frame when closed, rather than the sash overlapping the frame. It suits period and barn-style homes and usually carries a small premium over a standard stormproof casement, though that uplift varies by supplier.