Water near lights after a roof leak: what to do

Water and mains electricity do not mix, and a leak that reaches a ceiling rose or a downlight can let the two meet. So the first job has nothing to do with the roof. Do not flick the light switch to see whether it still works, and do not touch a fitting that is dripping, buzzing or hanging low. Keep children and pets out of the room.

If the fuse board is dry and you can reach it across a dry floor, switch off the lighting circuit, or the whole supply if you are unsure which one it is. If getting there means walking through water, leave it and ring an electrician instead. Set a bucket under any drip that is clear of the fitting, and lay towels well away from the wet area. Where the ceiling is sagging with trapped water, stay out from underneath it. The same caution applies even if the lights seem to be working normally.

A downlight or ceiling rose is a hole in the ceiling with cables running above it, and water follows the easiest route down. It rarely enters the roof directly above the fitting. More often it comes in at a slipped tile, a split flashing or a blocked valley, runs along a rafter or the underlay, then drops where the timber meets a gap. The cable entry or the opening for a downlight is that gap.

This is why the stain, or the wet fitting, can be some distance from the fault. It also means the first drip is a poor guide to the size of the problem. In the loft, look for dark timbers, wet insulation and a track of damp leading uphill, but only if the loft is safe to enter and nothing electrical is wet. Our guide to checking the loft for a roof leak explains the clues, and a roofer will follow them to the real entry point.

With the circuit off, the next step is to stop more water arriving. A leak near wiring jumps the queue for us, and the first call is about making the roof secure: a temporary cover or a quick repair to the entry point, so the ceiling can begin to dry. Where the leak is bad, a tarpaulin may be the fastest way to protect the house until the weather settles, though only someone equipped to work at height should fit it.

Photograph everything before it is cleaned up: the wet ceiling, the fitting, the loft and the roof as seen from the garden. These matter if a storm caused the damage and you take it to your insurer. Afterwards come the survey pictures and a written price for the lasting repair, as a single total, with enough detail in the photographs for you to follow what was found. Our page on making a roof safe explains what happens on that first call.

A ceiling that has been soaked needs time and ventilation to dry, and that takes longer than people expect. Open windows when the weather allows, use a dehumidifier if you have one, and leave the light circuit off until the area is properly dry. If plaster is bulging or heavily stained, it may need to come down so the void above can dry as well.

Then bring in a qualified electrician to test the circuit and inspect the fitting before anyone switches it on again. Wet cable insulation, damp connectors and corroded terminals can all look fine from below and fail later. That check is a job for an electrician, not a roofer, and we would rather you paid for it than trusted a light that only looks dry. Once the roof repair is done and the ceiling is sound, redecorating can wait until the plaster has dried completely.

This job can involve three trades and an insurer, so records help. Which? suggests keeping damaged things unless they are a hazard. A wet light fitting may count as one, so photograph it and dispose of it only on your electrician's advice. Keep every receipt for emergency work as well.

Write a short list with dates: when the leak started, what you switched off, who you called and what they found. A dated note like this is far more useful to an insurer than a memory of events weeks later. If you are unsure which problem comes first, our answer on who to call for a leaking roof covers it, and the emergency roof repairs page shows how a leak is handled once the room is safe. Wiring should stay off until an electrician has signed it as sound, however dry the ceiling looks.