Double Glazing in London: Costs, Choices and Local Installers (2026)

Looking for new windows or doors in London? This local guide covers what to expect on price, which styles suit homes in the area, and how to find a trustworthy, accredited installer near you.

What double glazing costs in London

Prices in London track the national picture: a standard white uPVC casement typically lands around £400–£750 supplied and fitted, with sash, bay, coloured and aluminium options higher. Doing several windows together lowers the per-window cost. For a figure that reflects your actual home, compare free quotes from local firms.

Choosing styles for London homes

London has a real mix of housing — period terraces where sash and flush-sash styles keep the character, and newer stock better suited to clean, modern casements, bi-folds and sliding doors. If you’re in a conservation area, check whether permission is needed before replacing street-facing windows.

Finding a trusted installer in London

Use an installer registered with FENSA or another Competent Person Scheme, compare at least three like-for-like quotes, and look for recent local reviews. Browse installers across London, see windows & doors specialists in London, or get matched to up to five local firms in a minute.

Frequently asked questions

How much are new windows in London?

Expect roughly £400–£750 for a standard uPVC casement fitted, more for sash, bay, coloured or aluminium. The best way to price your job is a few local quotes.

Do I need planning permission for windows in London?

Usually not for like-for-like replacement, but conservation areas and listed buildings can require it — check with the council first.

How do I find a FENSA installer in London?

Browse accredited installers in London or get free quotes and the matched firms will confirm their registration.