Find it before it spreads
Water Leak Detection
Not every leak announces itself. Some escape quietly behind walls, under floors or above ceilings for weeks, showing up only as damp, a musty smell or a rising water bill. Professional leak detection locates a concealed leak accurately, so the right section can be repaired with the least possible disruption. We offer leak detection across our confirmed UK service areas.
Know the warning signs
How does a hidden leak show itself?
A leak you cannot see still leaves clues. Catching them early is the difference between a small repair and lasting harm to plaster, flooring and timber. Watch for:
- Damp or discoloured patches on walls, floors or ceilings
- A persistent musty smell, or mould forming in one spot
- A water bill that has risen with no change in use
- A drop in water pressure at the taps
- The sound of running water when nothing is in use
- A water meter that keeps turning with everything switched off
For a fuller look at each of these, see our guide to the signs of a hidden water leak.
A quick check you can do
To test for a leak, turn off every tap and water-using appliance, then read your water meter. Note the figure, leave it an hour or two without using any water, and check again. If the reading has moved, water is escaping somewhere in the system, which is a strong sign it is worth investigating.
If what you have is an active, spreading leak rather than a suspected hidden one, go straight to emergency water leak repairs.
How detection works
Which methods locate a leak you cannot see?
Rather than open up walls and floors on a hunch, leak detection uses non-invasive techniques to narrow the search to a small area. These are the standard methods used across the trade.
Acoustic listening
Sensitive listening equipment picks up the distinctive sound water makes as it escapes under pressure. By comparing that sound at different points, a plumber can trace it back towards the source, even through a solid floor or wall.
Moisture and thermal checks
Moisture meters measure dampness in building materials, while thermal imaging reveals the temperature differences left where water has spread. Together they map how far a leak reaches and point to where it begins.
Pressure testing
Isolating a section of pipework and watching the pressure shows whether that part of the system is losing water. It is a reliable way to confirm which run of pipe is at fault before any access is made.
Tracing and inspection
Visual inspection, careful tracing of pipe routes and, where it helps, a look at the drainage build up a full picture. The methods are combined to suit the property and the type of leak.
Why does finding a leak early matter?
A hidden leak rarely stays small. Water runs along joists and through plaster, swells and lifts flooring, and feeds damp and mould that affects both the building and the air inside it. Left long enough it can reach electrics and weaken structural timber, turning a modest pipe repair into a major restoration.
There is a cost side to it as well. Water escaping day and night is water you are paying for, and prolonged damage is far dearer to put right than the leak that caused it. Locating a leak early, then repairing it properly, protects both the property and your budget.
Detection is the first step towards a repair, not the end of the job. Once the source is found, we can reinstate a section of pipe, remake a joint or replace a worn fitting; see leaking pipe repairs for how those repairs are carried out.
After detection
From finding the leak to fixing it
Locate the source
We use the methods that suit the property to pinpoint where water is escaping, keeping the search area as small as we can.
Explain the findings
We show you what we have found, what access the repair needs and the options, so you can make an informed decision.
Repair and reinstate
We carry out the repair, test that the leak has stopped and leave the area clean, with any access made good as agreed.
Frequently asked questions
Leak detection, answered
How do you find a leak you cannot see?
Plumbers use a combination of non-invasive techniques rather than simply opening up walls and floors. These can include acoustic listening equipment that picks up the sound of escaping water, moisture meters and thermal imaging to map where water has spread, and pressure testing to confirm whether a section of pipe is losing water. The aim is to narrow the search to a small area before any access is made.
Why bother with detection rather than just opening up?
Pinpointing a leak first keeps disruption and repair costs down. Without detection you risk lifting floors or cutting into walls in the wrong place, causing damage that then has to be made good as well. Locating the source accurately means only the affected section is exposed, so the repair is quicker and tidier.
What are the signs I might have a hidden leak?
Common signs include damp or discoloured patches on walls, floors or ceilings, a persistent musty smell, an unexplained rise in your water bill, a drop in water pressure, the sound of running water when nothing is in use, or a water meter that keeps moving with everything switched off. Our advice article on the signs of a hidden water leak explains what to watch for.
Do you repair the leak once you have found it?
Yes. Detection is the first step towards a repair, not an end in itself. Once we have located the source, we can carry out the repair or explain the options, whether that is reinstating a section of pipe, remaking a joint or replacing a worn fitting.
Think you have a hidden leak?
Email our team to talk it through, or request a call back and we’ll get the right information to arrange assistance.