Skylight leak repair in the UK
Fixing leaks around skylights — usually flashing or seal failure rather than the glass unit itself.
Typical UK cost range
£200–£900
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
Skylight leaks are almost always a flashing or seal problem, not a failure of the glass unit itself. The most common failure points are the lead flashing around the kerb, the EPDM or foam gaskets where the frame meets the glazing, and the tile-to-frame junctions on the weather side.
A good repair identifies which of those is failing and fixes just that — swapping a whole skylight unit is rarely necessary unless the frame itself has rotted or the glazing has failed.
What changes the price
- Which part has failed — flashing is cheapest, gasket replacement is moderate, frame replacement is the most expensive.
- Skylight brand and model — Velux parts are the most available in the UK.
- Access, especially on high-pitch or dormer installations.
- Whether the surrounding roof covering needs disturbing to do the fix.
Timeline: Usually 2–4 hours on site for a flashing or seal repair.
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
Is the leak through the glass itself?
Almost never. Modern double and triple glazed skylight units don’t leak through the glass. If you see water on the inside of the unit it’s either condensation (a ventilation issue) or water tracking in through a failed seal or flashing.
Can I replace just the flashing without removing the whole skylight?
Usually yes, for most Velux-style skylights. The flashing kit comes off independently of the glazed unit. An experienced roofer can do this without disturbing the main skylight.
Related guides
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