Skylight installation in the UK
Installing new skylights — cutting the opening, fitting the unit, flashing it in properly.
Typical UK cost range
£800–£3,000
National baseline. City-specific ranges are adjusted for local labour and access costs on the city pages below. See the full UK cost guide for the methodology and the factors that move a quote.
What the job involves
A new skylight install involves cutting an opening in the roof structure, trimming the rafters, fitting the frame, and flashing it into the surrounding covering. Velux is the dominant UK brand; Fakro and Keylite are credible alternatives at lower price points.
The structural work requires attention to rafter trimming — Building Regulations require any rafter that is cut to be supported by the trimmer either side. A structural calculation is sometimes needed on larger openings.
What changes the price
- Skylight size and brand.
- Whether structural trimming of rafters is needed (usually yes on anything larger than a single rafter bay).
- Interior plasterboard reveal work.
- Scaffold access for the roofer working outside.
Timeline: Usually 1–2 days per skylight.
Pick a city for local pricing
Each city page has adjusted cost ranges, local context, and the roofers in our directory that cover it.
Major English cities
Other English cities
Northern Ireland
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Start my quote requestCommon questions
Do I need Building Regulations approval?
Yes, because structural rafters are being cut. A registered roofer or builder can usually notify Building Control or a private approved inspector. Smaller roof windows in existing rafter bays may be simpler; anything larger needs a structural sign-off.
Is Velux worth paying more for?
Velux spares and replacement parts are widely available for 30+ years, which matters when seals and gaskets eventually need replacing. Cheaper brands can be fine if you don’t mind replacing the whole unit when something fails.
Related guides
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