How Much Does Double Glazing Cost in 2026?

New double or triple glazing improves energy efficiency, reduces noise, and enhances security. In 2026, replacing all windows in a 3-bed house costs £3,000–£12,000 depending on frame material.

Typical UK range:£3,000 – £12,000

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Cost Breakdown by Tier

uPVC£3,000 – £5,000

Most affordable and popular option. Low maintenance, 20+ year lifespan.

Aluminium£5,000 – £8,000

Slim frames, modern aesthetic, excellent durability. Popular for extensions.

Timber£8,000 – £12,000+

Traditional appearance, excellent insulation, suits period properties. Requires maintenance.

Factors That Affect the Cost

Number and size of windows
Frame material choice
Glass specification (double, triple, low-E)
Window style (casement, sash, tilt-and-turn)
Listed building or conservation area restrictions

Regional Price Variations

Window prices are consistent nationally, but fitting costs are 15-25% higher in London and the South East due to labour rates.

Frequently Asked Questions

How much does one double-glazed window cost?

A standard uPVC casement window costs £300-£600 fitted. Bay windows cost £1,000-£2,500. Sash windows cost £800-£1,500 each.

Will new windows reduce my energy bills?

Upgrading from single to double glazing saves £100-£200/year on heating. Upgrading old double glazing to modern A-rated units saves £50-£100/year.

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Read our full Double Glazing cost guide