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.
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 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?
Will new windows reduce my energy bills?
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