Leak From the Flat Above? How We Find the Source

Water travels. It runs along joists, follows pipe runs and collects on the top of plasterboard before dropping through the weakest point. So a wet patch above your bathroom door can come from a shower tray two rooms away upstairs. A stain in a bedroom can come from a kitchen appliance connection above it. In purpose-built blocks around Watford and across London the pipes also run in communal risers and ducts. The water may not belong to the flat directly above at all. The source has to be found, not assumed.

With access to the flat above, the survey works through every fitting that could be responsible. Baths, shower trays, basins and toilets are tested with dye and running water while the ceiling below is watched. Pipework is pressure tested with nitrogen to show whether a hidden pipe is holding or losing. A thermal camera picks out hot water and heating runs behind tiles and under floors, and the moisture meter maps how far the water has spread. A test strip on the water tells mains from heating water, which matters when a communal riser is a suspect.

If the neighbour is away, or will not allow access, the survey still has value. We document everything that can be seen from your flat and from the common parts. That means the extent of the staining, the moisture readings, thermal images of the ceiling and any riser cupboards, and whether the water is mains, heating or waste. That gives the managing agent a factual basis to request access or arrange it under the lease. We do not enter another flat without the permission of the occupier or the agent.

The report is written for the people who have to sort out the cost. It names the fitting or pipe at fault, shows the test results and photographs, and keeps the detection, the access work and the repair as separate items. Who pays usually depends on the lease and on which policy responds. That is a matter for the managing agent and the insurers rather than for us. What we can do is give both insurers the same clear evidence and speak to a claims handler or loss adjuster if asked.