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Double glazing cost: what it really costs in 2026
Per window, honestly priced.
£650 – £1,105 per window
uPVC casement windows start around £650 each fitted. Sash styles run about £975 and tilt-and-turn around £1,105. A whole-house replacement typically starts near £9,500.
Price by spec
| Option | What it means | Typical price |
|---|---|---|
| uPVC casement | The standard — best value | £650 / window |
| uPVC sash | Period look, modern performance | £975 / window |
| Tilt & turn | Easy cleaning, full opening | £1,105 / window |
What actually happens
- Survey and exact measuring of every opening
- Old windows cut out one room at a time
- New frames levelled, fixed and packed
- Sealed, trimmed and made weathertight inside and out
- Handles, vents and restrictors fitted
- FENSA certificate issued
Popular choices
Anthracite grey framesFlush casement stylingAcoustic glass on road-facing rooms
Regulations to know
- Replacement windows must be certified through FENSA or CERTASS (or signed off by building control)
- Conservation areas and listed buildings restrict styles and materials — check first
Tips from the trade
- The FENSA certificate matters at sale time — chase it if it doesn't arrive
- A-rated glass is standard now; don't pay a premium for it
Plan this project properly
Get a region-adjusted estimate, track budget against real quotes, and find local tradespeople -- free to browse on Qome.
Start planning on QomePrices on this page are approximate, region-adjusted guide figures built from cross-checked UK cost data. They exist to inform you, not to bind anyone. Actual prices are whatever you and your tradesperson agree, and a difference between a Qome guide figure and a real quote is not a fault in either.