Plumbing leaks: what to know
A plumbing leak is worth ruling out when damp is localised near a bathroom, kitchen, radiator, pipe run or room below plumbing — especially if it does not track the weather.
What to check first
- Check visible joints, wastes, appliance hoses and sealant lines for active leakage.
- Compare water-meter readings when all outlets are off if you suspect a hidden supply leak.
- Look at the room or pipework directly above a ceiling patch.
What not to assume
Do not start damp-proofing work until an obvious or plausible plumbing source has been excluded.
Sensible next step
Repair the leak, remove persistently wet damaged material where necessary, and allow the construction to dry before redecorating.
The clues that matter most
Use several clues together rather than treating one mark, smell or meter reading as proof.
Check visible joints, wastes, appliance hoses and sealant lines for active leakage.
Compare water-meter readings when all outlets are off if you suspect a hidden supply leak.
Look at the room or pipework directly above a ceiling patch.
Do not start damp-proofing work until an obvious or plausible plumbing source has been excluded.
Repair the leak, remove persistently wet damaged material where necessary, and allow the construction to dry before redecorating.
Could it be something else?
These routes help separate common causes that can create similar visible damage.
Useful products for this stage
Only products that support the investigation or an appropriate fix are shown here. An active leak or building defect still needs repairing.
