Escape of water — water leaking from plumbing within a building — is the most expensive domestic insurance claim in the UK, averaging around £6,000 per claim. The damage is usually disproportionate to the initial fault: a slow, hidden leak in a first-floor bathroom can saturate joists, damage ceilings, ruin flooring, and create conditions for mould and rot long before it becomes visible. Knowing how to find a leak and what your insurance covers is essential knowledge for any homeowner.
Finding Hidden Leaks
If you suspect a leak but can't locate it, start with the water meter. Turn off all taps and appliances, then check whether the meter is still moving — any movement confirms a leak somewhere in the system. Isolate sections of the system (isolating valves on branches) to narrow down which circuit is leaking.
For leaks within floor or wall structures, thermal imaging cameras (available to hire or from specialist leak detection companies) can identify temperature differentials caused by damp. Acoustic listening devices can pinpoint the sound of water movement through masonry or timber. These specialist leak detection services cost £200–£500 but are far less destructive than random opening up of floors and walls.
Trace and Access Cover
Most buildings insurance policies include "trace and access" cover — paying for the reasonable cost of locating the source of a leak (opening up floors, walls, or ceilings) but not necessarily for reinstating the finishes. The repair of the pipe itself may or may not be covered depending on the cause. Read your policy carefully.
Escape of water cover pays for damage caused by the leak — damaged ceilings, floors, plasterwork, decoration. The excess for escape of water claims is typically £250–£500. Some insurers require evidence of regular boiler servicing and maintained pipework.
Prevention
Isolating valves on every branch circuit and fitting that can be individually isolated make leak detection and emergency shut-off much faster. A whole-house water shut-off valve (Speedfit, John Guest) that can be turned without tools is essential to know the location of. Smart leak detectors (Fibaro, Hive, Phyn) that sense water on the floor near appliances are increasingly inexpensive and can alert you to a leak before significant damage occurs.