Water Coming Through the Ceiling? What to Do in the First 10 Minutes

Water dripping or pouring through your ceiling is alarming, but a few calm steps in the first ten minutes can save a lot of damage. Keep everyone away from light fittings and any bulging patch, find where the water is coming from, and turn it off. If you’re in Clare, Sudbury, Haverhill, Long Melford or a village nearby, here’s what to do, and when to hand it over to a plumber.

First: stay safe under the leak

Water in a ceiling is heavy, and it often runs along joists and cables to come out at a light fitting or a crack. Before you do anything else:

• Don’t stand under a bulging, sagging or cracked area. Keep children and pets out of the room. Don’t poke or push the ceiling — leave a bulge alone and get help.
• Don’t switch on the light in that room, and don’t touch a light fitting, switch or socket that is wet or near the water.
• If water is coming through or near a light fitting, switch the power off at the consumer unit (fuse box) only if you can reach it from a dry place with dry hands. Otherwise leave it and keep clear. Electrical Safety First warns that water and electricity are a dangerous mix and that wet electrics should be checked by a registered electrician before they’re used again.
• If a trip switch (RCD or circuit breaker) has gone off, you may reset it once, and only if your hands and the floor are completely dry. If it trips again, leave it off and call a registered (Part P) electrician.

Step by step: stopping water coming through the ceiling

1. Look at what’s directly above. In most homes it’s a bathroom, en-suite, airing cupboard or loft. Which? Trusted Traders’ plumbers say the most common cause of a leak through the ceiling is a worn seal around a bath with a shower over it, where water has slowly built up under the floor.
2. Stop using the bathroom upstairs. Turn off any running taps or the shower, and don’t flush or run a bath until it’s been checked.
3. Turn off the nearest isolation valve if you can see one. Toilets, basins and some taps have a small valve on the pipe with a screw slot; a gentle quarter turn with a flat screwdriver closes it. Don’t force it.
4. Still dripping, or can’t find the source? Turn off the inside stopcock. It’s usually under the kitchen sink, in a utility room, cloakroom or under the stairs. Turn it clockwise gently. Our guide shows you how to find and turn off your stopcock, and what to do if it’s a seized or leaking stopcock.
5. Empty the pipes. With the stopcock off, open the cold kitchen tap and let it run until it stops. That uses up the water still sitting in the pipework, so less of it finds its way into the ceiling.
6. Think about the heating. Radiators and heating pipes run on a separate sealed circuit, so turning off the stopcock won’t stop a heating leak. If you suspect a radiator pipe or the boiler, switch the heating and hot water off at the programmer or boiler controls, as your user manual describes. Don’t open the boiler casing or try to empty the heating system. See radiator leaking for what’s safe.
7. Catch and protect. Put buckets or bowls under the drips, lay towels, and move furniture, rugs, electrical items and valuables out of the way.
8. Take photos from a safe, dry spot. Photograph the ceiling, any damp patches upstairs and where you think it’s coming from. Your insurer will want them, and they help us find the leak faster.

Clues to where the water is coming from

• Only when someone showers or has a bath: often a failed bath or shower-tray seal, or a leaking waste joint under the bath.
• Only after a flush, or constantly: a toilet supply or cistern fault. Our guide to a dripping toilet overflow covers the isolation valve.
• From the top floor ceiling, with a tank in the loft: check whether the loft tank is overflowing — see loft tank overflowing, and only go into the loft if it’s safe to do so.
• Only when the heating is on: likely a heating pipe or radiator valve under the floor.
• Only in heavy rain: that points to the roof, gutters or flashing rather than plumbing, so contact a roofer.
• In a flat or terraced home: the water may be coming from next door or the flat above. Let your neighbours, landlord or managing agent know straight away.

If a lot of water is pouring in, or a pipe has burst, follow our flood or burst pipe guide.

When to stop and call us

• The ceiling is bulging, cracked or sagging, or water is coming through a light fitting.
• You can’t find the source, or it’s still leaking with the isolation valve or stopcock turned off.
• Your stopcock won’t turn, or you can’t find it.
• The leak seems to be from heating pipes, a radiator, the hot water cylinder or the boiler. Only a Gas Safe registered engineer may work on a gas boiler.
• Electrics have got wet or keep tripping. As NAPIT registered electricians, we can check them for you once the water is off.

Our emergency plumbing team can stop the leak and make it safe, our leak detection service can trace hidden leaks under floors, and we carry out pipe repairs, bath and shower seal repairs and electrical checks.

The outside or boundary stop tap is usually owned by your water company (Anglian Water or Essex & Suffolk Water) and may need a special key, so don’t dig it up or force it. If you think there’s a leak on their side, check whether neighbours are affected and contact the water company.

Stop it happening again

• Every few months, look at the sealant around your bath and shower tray. If it’s cracked, black or coming away, get it replaced before water gets underneath.
• Which? Trusted Traders’ plumbers suggest running a hand around the pipe joints you can reach in the bathroom every six months or so, because the leaks that cause the most damage are usually small drips left for a long time.
• Know where your stopcock is, and turn it off and on gently now and then so it doesn’t seize.
• Watch for early warning signs downstairs: a brown stain, flaking paint or a soft patch on the ceiling is worth checking before it turns into a drip.

Smell gas or suspect carbon monoxide? Leave the property, open doors and windows if it’s safe, don’t use light switches or naked flames, turn the gas off at the meter only if it’s safe to do so, and call the National Gas Emergency Service on 0800 111 999. Get medical advice if anyone has CO symptoms such as headaches, dizziness or nausea. Only a Gas Safe registered engineer may work on gas appliances; you can check an engineer on the Gas Safe Register.

Sources and further reading

• Which? Trusted Traders: tips on five common plumbing problems (leak through the ceiling)
• Which? Trusted Traders: how to stop a water leak
• Electrical Safety First: electrical safety after a flood
• Anglian Water: your stop tap

This is general safety guidance. If you’re unsure, stop and call a qualified engineer.