Free Tool · 2026 UK Pricing · No Sign-up
Double Glazing Cost Calculator UK
Estimate the 2026 cost of new double glazing — by frame material, number of windows and region. Instant result, no email needed.
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Pick your frame material, enter how many windows you need and choose your region for an instant 2026 fitted-price estimate.
2026 Price Guide
Double glazing prices, 2026
| Option | Typical 2026 cost |
|---|---|
| Per uPVC window | £450 – £900 |
| Whole-house uPVC (8–10) | £4,500 – £8,500 |
| Aluminium (per window) | £900 – £1,400 |
| Heritage sash (per window) | £1,000 – £1,800 |
A FENSA or CERTASS registered installer self-certifies the work to Building Regulations. Full detail in the double glazing cost guide.
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FAQs · 2026
Double Glazing cost questions
Expect around £450–£900 per uPVC window fitted in 2026. A whole-house uPVC job of 8–10 windows is typically £4,500–£8,500, aluminium runs £900–£1,400 per window and heritage sash £1,000–£1,800. London and the South East are 10–25% higher.
Yes — these are supply-and-fit estimates per window, including removal of the old units and installation. Bay windows, very large units and structural openings cost more.
Aluminium offers slimmer, stronger frames and timber suits period and listed homes, so both cost more than standard uPVC. Heritage sash windows are the priciest because of the joinery and conservation detailing involved.
Replacement windows must meet Building Regulations for energy efficiency. A FENSA or CERTASS registered installer self-certifies the work, so you do not need a separate building control application.
A typical 8–10 window installation is usually completed in one to three days, depending on access, frame type and any made-good plastering or decorating needed afterwards.
Last reviewed June 2026. Double glazing figures reflect 2026 supply-and-fit per-window rates by FENSA / CERTASS registered installers across UK regions. This calculator gives a budgeting estimate, not a quote. Editorial standards: /editorial-standards. See all free calculators or the cost guide hub.