Cost GuidesUpdated May 2026By TradeMatch Editorial Team·7 January 2026·Updated 12 April 2026·6 min read

Double Glazing Cost Guide: UK Prices for 2026

New double glazing improves energy efficiency, reduces noise and boosts property value. Here is how much it costs in 2026 and what to look for.

Professional tradesperson completing quality work

Double Glazing Prices

Window Type	Per Window	Full House (10 windows)
uPVC casement	£350–£600	£3,500–£6,000
uPVC sash	£600–£1,200	£6,000–£12,000
Aluminium	£500–£900	£5,000–£9,000
Timber	£700–£1,200	£7,000–£12,000
Triple glazing (uPVC)	£500–£900	£5,000–£9,000

FENSA Registration and Building Regulations

Window replacements must be fitted by a registered window fitter and comply with building regulations for thermal performance (Part L). A FENSA-registered installer can self-certify compliance, saving you the cost and hassle of a building control application (£200–£400). Always check your installer is FENSA or CERTASS registered.

How to Choose a Window Installer

1. Check FENSA/CERTASS registration — Essential for compliance
2. Get 3+ quotes — Prices vary significantly between installers
3. Check the warranty — Look for 10+ year guarantees on frames and 5+ years on sealed units
4. Ask about energy ratings — Windows are rated A++ to E, with A+ or above recommended
5. Read reviews — On TradeMatch, every installer has verified homeowner reviews

Frequently Asked Questions

How long does double glazing last?

Two things age at different rates, and only one of them is the frame. The sealed unit fails when its perimeter seal lets moisture in — that is what misting between the panes means, and it can happen long before the frame is worn out. The frame itself lasts longer: aluminium and well-maintained timber outlast uPVC, which eventually loses its gasket seal and hinge alignment. Misted units can often be replaced on their own without changing the frames, which is a far cheaper job — worth asking about before anyone quotes you for full replacement windows.

Will new windows reduce my energy bills?

Yes. Replacing single-glazed windows with A-rated double glazing cut heat loss through the glazing. How much you save depends on what you are replacing, the size and orientation of the windows, and how you heat the home.