Quick answer
A warm or damp floor, lifted boards, unexplained meter movement or falling heating pressure may point to a leak under the floor. These signs have other possible causes, so get the source assessed before lifting flooring.
Notice changes underfoot
Look for localised warmth, staining, swelling, loose flooring or a persistent damp smell. A heating pipe leak may affect system pressure, while a cold-water leak may show as continuous meter movement. Underfloor heating, sunlight and ventilation can also create temperature differences.
Make safe observations
- 1Record where and when the floor feels warm or damp, without removing flooring.
- 2Check the water meter with water use stopped, and note whether the reading changes.
- 3If a heating system is losing pressure, record the pattern and avoid repeatedly topping it up without advice.
- 4Move valuables away from wet areas and keep clear of nearby electrics.
Locate before opening
Pipes and cables can run beneath floors, so lifting boards or drilling without a plan can cause further damage. A professional may combine pressure checks, acoustic methods, thermal imaging or moisture assessment, depending on the pipe and floor construction. TraceFix provides leak detection in Birmingham and London; access should be limited to what is needed to confirm and repair the fault.
When to call a plumber
- The floor is persistently wet or a damp area is growing.
- A meter moves with all known water use stopped.
- Heating pressure repeatedly falls or topping up is frequent.
- There is water close to electrical equipment.