Useful advice comes first
A patch, smell or tide mark can have several causes. Our checker looks at the signs you describe, then offers possible explanations and practical next steps. It does not make a diagnosis or replace an inspection.
If the pattern fits condensation or water getting in from outside, the guidance follows that path. If there are signs of a plumbing problem, it explains when a plumber, heating engineer or leak detection specialist may be appropriate.
How we work
Damp or Leak is a standalone website operated by ADI Leak Solutions Ltd, trading as ADI Leak Detection. Its commercial purpose includes introducing people with suspected hidden leaks to ADI. It is not an independent comparison service.
For suspected hidden leaks, call ADI Leak Detection on 0333 567 2642, our dedicated enquiry number.
We do not guarantee that a leak will be found, quote investigation prices or promise availability. Those details need to be confirmed with the service provider before booking.
Where the guidance comes from
Our content draws on published UK guidance about moisture, building defects and water use. These sources do not endorse or operate this website.
The content was checked against these sources in September 2026. Website photographs are generated illustrations of domestic settings, not customer cases or proof of a diagnosis.
When to get help sooner
Water near electrical fittings, rapidly escaping water or a bulging ceiling requires prompt help in person. Keep clear of the affected area. Contact an emergency plumber, your water supplier or your landlord’s emergency service as appropriate. Call 999 if there is immediate danger to life.