Signs You Have a Hidden Water Leak (and What to Do)
Higher bills, warm floor patches, a meter that ticks overnight, how leaks announce themselves.
The tells
A water bill that climbs without a reason. A hot spot on a solid floor. Low boiler pressure that needs topping up weekly. A meter that moves when every tap is off overnight. Damp or salts on a wall with no plumbing visibly near it. Any two of these together deserve investigation.
The meter test
Turn off every outlet, photograph the meter, wait two hours without using water, photograph it again. Movement means a leak on your side of the meter. This one free test settles most arguments with insurers and water companies.
Why detection beats exploration
Acoustic and thermal detection finds a buried leak within centimetres, so one floorboard comes up instead of six. It costs more than a speculative hole; it is far cheaper than three speculative holes. Insurers increasingly expect a detection report before they pay out trace-and-access claims.
How detection actually works
Acoustic correlation puts microphones on the pipework either side of a suspected run and triangulates the sound a pressurised leak makes. Thermal imaging maps the heat plume from a hot-water leak under a solid floor. Tracer gas, hydrogen and nitrogen introduced into a drained pipe, escapes at the fault and is detected at the surface. Most jobs use two of the three.
Trace and access: the cover people forget they have
Most UK home policies include cover specifically for finding a leak and reinstating what had to be opened to reach it. It is separate from the escape-of-water cover for the damage. Insurers want a report with cause, position, depth, photographs and the repair carried out, which is why the report matters as much as the detection.
Leaks that are not on your water supply
Not everything wet is a plumbing leak. Failed pointing, a blocked gutter, a cracked shower tray seal, a failed damp-proof course and condensation all produce damp that looks identical to a pipe leak. The meter test is what separates them: if the meter moves with every outlet closed, it is your supply. If it does not, stop looking at the plumbing.
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