How Much Do Aluminium Windows Cost in the UK? (2026 Guide)
2026 UK prices for aluminium windows, from casement to fixed and slimline. See cost per window, what drives the price and how to budget for your project.
Aluminium windows have become the go to choice for renovations and new builds that want slim frames, big glass and a modern look. But how much should you actually budget in 2026? Here are realistic UK figures and the factors that move the price.
Typical 2026 prices
As a rough guide for supply of a quality made to measure aluminium window in the UK:
A standard casement window (around 1200 x 1200mm) typically ranges from about £450 to £900 supply only. A larger or fixed picture window can run from £600 to £1,500 depending on glass size and specification. Bay and specialist shapes cost more because of the extra frames and corner posts.
These are supply figures. If you need installation, add fitting on top, which varies by region and access.
What drives the price
Several things determine where your window lands in that range.
Size is the biggest factor: more glass and a bigger frame means more cost. Glass specification matters too, with solar control, acoustic, obscured or triple glazing all adding to the base price. The opening style changes the price, since fixed windows are cheaper than opening casements, and tilt and turn mechanisms add hardware cost. Colour is usually included in any standard RAL, but dual colour (different inside and out) can add a little. Finally, the number of windows affects the per unit price, as larger orders spread setup costs.
Why aluminium costs more than uPVC
Aluminium windows sit above uPVC on price because the material is stronger, allowing much slimmer frames and larger panes, and because the powder coated finish is more durable. You are paying for a window that stays crisp and true for decades rather than one that may discolour or distort. For many homeowners the look alone justifies the difference.
How to keep the cost sensible
Standard rectangular casement and fixed windows are the best value per square metre. Complex shapes, bays and lots of small opening sections push the price up. Ordering all your windows together, rather than in dribs and drabs, usually earns a better overall price. And choosing a standard RAL colour keeps you on the base rate.
Getting an accurate figure
The only way to know your real cost is to price your exact sizes and specification. Rather than wait for a quote, you can size and price aluminium products online and see the number instantly.
Frequently asked questions
Are aluminium windows more expensive than uPVC? Yes, they typically cost more upfront, but you get slimmer frames, larger glass and a longer lifespan, which many homeowners feel is worth the difference.
How long do aluminium windows last? A quality aluminium window with a powder coated finish can last 30 years or more with very little maintenance.
Do aluminium windows meet Building Regulations for energy efficiency? Yes. Modern aluminium windows use a thermal break and energy efficient glazing to meet UK Building Regulations U value requirements.
Want a firm price for your project? Browse and configure aluminium glazing online with free UK mainland delivery, or read our related guide on how much aluminium sliding doors cost.
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Author at SmartaView, writing about aluminium glazing, home improvements and the buying process.
