The worst leaks are the ones you cannot see. Water escaping inside a wall, under a floor or in a ceiling can rot timber, damage plaster and encourage mould long before it drips into view. These are the seven signs we see most often before finding a hidden leak.
Need a plumber in London? Get a free quote or call 07405088196.
1. Damp patches or staining
Yellowish or brown rings on ceilings, or darker patches on walls that do not dry out, are the classic sign. Patches that grow after a shower or bath point to a leak in the bathroom above.
2. A musty smell
A damp, earthy smell in cupboards, under stairs or in one room often means water is trapped somewhere it cannot evaporate.
3. Mould in unusual places
Mould in a bathroom with poor ventilation is common. Mould on a wall away from wet rooms, or behind furniture against an internal wall, is a warning sign.
4. Peeling paint or bubbling plaster
Moisture behind paint or wallpaper pushes it away from the wall, causing bubbles, flaking or a soft, crumbly surface.
Book a plumber in London
Fixed-price quotes from local, fully trained plumbers.
5. Warm patches on the floor
A warm spot on a tiled or concrete floor can mean a leaking hot water or heating pipe in the screed below.
6. Low or dropping water pressure
If pressure has dropped and your neighbours are unaffected, water may be escaping between the meter and your taps.
7. A higher bill or a meter that keeps moving
The most reliable test: with all water turned off, your meter should not move. If it does, water is going somewhere.
What to do if you spot these signs
Turn off the water if the leak is active and causing damage, then get it investigated. Professional leak detection uses thermal imaging, acoustic listening equipment and tracer gas to find leaks without unnecessary damage, so only the area that needs repairing is opened up.
Frequently asked questions
Can a hidden leak cause structural damage?
Yes. Over time, water can rot joists and floorboards, damage plaster and, in some cases, affect foundations.
Is leak detection worth it?
It usually saves money by avoiding guesswork and unnecessary damage to floors and walls.
How long does leak detection take?
Most surveys take one to three hours, depending on the size of the property.
