sash window installation specialists in London
If you're looking for sash window installation in London, you're in the right place. Pro-Fit Window Systems connects homeowners across Greater London with FENSA-registered sash window installation installers who offer free, no-obligation quotes.
From a single window replacement to a full property upgrade, our network of Greater London specialists will compete for your job. Homeowners in London who compare quotes typically save £500–£1,500 against the first price they're offered.
Sash Windows prices in London 2026
The table below shows typical installed prices for sash window installation in London and the Greater London area. Prices vary by specification — get an exact quote using our free tool.
| Window Type | From (installed) | Up to (installed) |
|---|---|---|
| Casement (single) | £438 | £875 |
| Casement (large) | £625 | £1,125 |
| Sash Window | £750 | £1,375 |
| Bay Window (3-panel) | £1,500 | £4,000 |
| Tilt & Turn | £500 | £938 |
* Prices are estimates for London based on current market data. Your exact quote will depend on window size, specification and chosen installer.
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Get Quotes in London →FAQs — Sash Windows in London
Sash Windows prices in London — what should I budget?
Installed sash window installation costs in London start from around £438 per window and can reach £4,000 for larger bay units. Greater London prices are slightly above the national average. Getting multiple quotes through our free service is the most reliable way to establish an exact budget.
What's the typical installation time for sash window installation in London?
For most London properties, window installation takes between one and three days. Replacing a single window can be completed in half a day. Your Greater London installer will carry out a free survey before the job and give you a precise timeline.
Are the window fitters in London properly certified?
Absolutely. FENSA registration is a mandatory requirement for all companies in our London network. It certifies that installers meet UK Building Regulations standards and automatically includes a 10-year insurance-backed guarantee on every job.
Do I need planning permission for new windows in London?
Most standard window replacements in London are covered by permitted development rights and require no planning application. If your property is listed or sits within a conservation area in Greater London, additional consent from the local council may be needed — your installer can guide you through this.