How Much Does Double Glazing Cost in the UK in 2026?

“How much does double glazing cost?” is the first question nearly every homeowner asks, and the honest answer is: it depends. Price varies with the material, the style and size of each window, the glass specification, and how many you replace at once. This guide gives you realistic 2026 ranges and, more importantly, shows you exactly what moves the number so you can judge a quote for yourself.

Typical double glazing prices in 2026

As a working guide, a standard white uPVC casement window supplied and fitted typically falls in the region of £400–£750 each, with larger or more complex windows (bays, sash, tilt-and-turn, coloured or woodgrain finishes) sitting higher. Doing a whole house of 8–10 windows usually brings the per-unit price down compared with a single replacement, because the installer’s set-up and travel are spread across the job.

These are ballpark figures to sense-check a quote against, not a price list — the only way to know your cost is a proper quote based on your actual openings.

What makes the price go up or down

• Frame material — uPVC is the most cost-effective; aluminium and timber cost more (see windows & doors specialists).
• Window style — a simple casement is cheaper than a sash, bay or shaped window.
• Glass — upgrading to a lower U-value, acoustic, obscured or toughened glass adds cost but can be well worth it.
• Colour and finish — anthracite grey and woodgrain foils typically add a premium over white.
• Access and making good — upper floors, scaffolding, or plastering after fitting can affect the total.

How to get an accurate price (and avoid being overcharged)

The sector has a long-standing reputation for inflated “was” prices and high-pressure sales. Protect yourself by getting at least three quotes for a like-for-like specification, checking each installer is FENSA registered (or on another Competent Person Scheme), and asking for the U-value in writing. A compliant replacement window must achieve a U-value of 1.4 W/m²K (WER Band B) or better.

Frequently asked questions

Is double glazing cheaper in 2026 than previous years?

Prices have broadly tracked materials and energy costs. The best saving usually comes from comparing several local installers rather than waiting for a ‘sale’.

Should I replace all my windows at once?

Doing several together almost always lowers the per-window price and gives a consistent finish, but you can phase the work by elevation if budget is tight.

Do cheaper windows mean worse windows?

Not necessarily — but compare the actual specification (profile, glass U-value, hardware, guarantee), not just the headline price.