casement window installation specialists in London
Finding reliable casement window installation installers in London just got easier. Pro-Fit Window Systems works with a vetted network of FENSA-registered specialists across Greater London who compete for your business — at no cost to you.
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.
Casement Windows prices in London 2026
Here's a guide to what you can expect to pay for casement window installation in London. All prices are installed costs — use our free tool to get your exact local quote.
| 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.
Get your free casement window installation quote in London
60-second form. No sales calls. Trusted FENSA-registered specialists.
Get Quotes in London →FAQs — Casement Windows in London
What is the price of casement window installation in London?
In London, you can expect to pay from £438 for a standard casement window installed, up to £4,000 for a full bay window. Prices in Greater London are slightly above the national average. The best way to get an accurate price is to compare quotes from local FENSA-registered installers using our free tool.
How long does window installation take in London?
The time required depends on how many windows are being installed. In London, a single window can be replaced in 2–4 hours, while a whole-house installation typically takes 2–3 days. Your installer will confirm the schedule during their free property survey.
How do I know your London installers are trustworthy?
Yes. Every installer in our London network is FENSA registered, which means they are certified to install replacement windows in compliance with UK Building Regulations. FENSA registration also provides a 10-year insurance-backed guarantee on all installations.
Do I need planning permission for new windows in London?
For the majority of London properties, window replacement is classed as permitted development and does not need planning permission. Exceptions apply if your home is in a Greater London conservation area or is a listed building, in which case local authority consent may be required.