Damp & Leak Detection London
Specialist non-destructive leak detection using thermal imaging, acoustic profiling, and tracer gas technology. We find hidden leaks behind walls, under floors, and underground — without tearing your home apart.
Why It Matters
Finding the Unseen Before It Becomes Catastrophic
A hidden water leak is one of the most damaging and insidious problems a London property can have. Unlike a visible dripping tap, concealed leaks silently saturate floors, walls, and foundations over months or years — often causing far more damage than they would have if detected early.
Traditional leak detection methods involve breaking into walls and lifting floors on a trial-and-error basis, causing significant disruption and cost. Our specialist engineers use state-of-the-art non-destructive technology to pinpoint the exact location of a leak with surgical precision — often without making a single access opening.
Once located, we provide a complete report and transparent quote for the repair. In the majority of cases, we can carry out the repair on the same visit, minimising disruption to your daily life.
Warning Signs of a Hidden Leak:
Our Detection Technology
Thermal Imaging Cameras
Our infrared cameras detect minute temperature variations in walls, floors, and ceilings caused by moisture. Cold water leaks create cool spots, and hot water leaks create warm spots — both clearly visible through our equipment. This is often the fastest and most reliable initial detection method.
Acoustic Leak Detection
Highly sensitive electronic listening equipment amplifies the sound of pressurised water escaping from pipes. Our engineers can isolate the specific acoustic signature of a water leak through walls, concrete floors, and underground — pinpointing the location with extraordinary accuracy.
Tracer Gas Testing
A mixture of hydrogen and nitrogen (safe, non-toxic, and non-flammable) is introduced into the suspect pipe under pressure. We then use a detector probe over the surface to identify exactly where the gas — and therefore the leak — is escaping.
Moisture Profiling
Using calibrated digital moisture meters, we map the extent of water saturation in building materials, helping establish the full spread of water damage and confirming the source and path of a leak.
Why Choose Our Leak Detection Service
Non-Destructive First
We always exhaust non-destructive detection methods before any access work is required. Our technology means we can pinpoint most leaks without making a single hole — protecting your home and minimising repair costs.
Insurance Claim Support
Many building insurance policies cover leak detection and trace-and-access costs. We provide comprehensive written reports and supporting documentation specifically structured to assist with insurance claims.
Detect & Repair in One Visit
We aim to locate your leak and carry out the repair in the same visit wherever possible. Our engineers carry a full range of repair materials and parts, meaning you're not left with a known leak while parts are ordered.
Customer Reviews
"Three other plumbers told me they'd need to rip up my entire kitchen floor to find the leak. Plumbers In London found it in 45 minutes with a thermal camera and fixed it through a single small access point. Remarkable service."
Emma Thompson
Islington, London
"Persistent damp in a corner of our sitting room turned out to be an underground leak from a supply pipe. They traced it precisely and repaired it with minimal disruption to the garden. Excellent from start to finish."
Paul Henderson
Kensington, London
"Had a leak somewhere under the bathroom floor causing a damp ceiling below. The thermal imaging pinpointed it exactly, the repair was done neatly, and they even helped us put together the insurance claim documentation. Outstanding."
Yasmin Shah
Finchley, London
Leak Detection FAQs
How do you detect leaks without causing damage?
We use three main non-destructive techniques: thermal imaging cameras that detect temperature variations caused by moisture, acoustic listening equipment that identifies the sound signature of water escaping under pressure, and tracer gas testing where a harmless gas is introduced to the system and detected at the leak point with a specialist sniffer. In the vast majority of cases, we can pinpoint the leak's exact location without any access openings.
What are the early signs of a hidden water leak?
Common early signs include unexplained increases in your water bill, damp patches on walls or ceilings that appear for no obvious reason, musty or mouldy odours in rooms, the sound of running water when all taps and appliances are off, hot spots on floors (indicating an underfloor heating leak), and a drop in boiler pressure that keeps recurring. If you notice any of these, don't ignore them — hidden leaks get worse over time.
How long does a leak detection survey take?
A standard residential leak detection survey typically takes 2–4 hours. More complex investigations in larger properties or where the suspected leak location is unclear may take longer. We'll give you a realistic estimate when you book.
What happens once you've found the leak?
Once the leak is located precisely, we provide a full report of our findings along with a transparent quote for the repair. In many cases we can carry out the repair on the same visit. If access is required (e.g. lifting a small section of floor or making a small inspection opening), we'll discuss this with you before proceeding and ensure the area is made good afterwards.
Can hidden leaks cause structural damage?
Yes, and this is why prompt detection and repair is so important. Persistent hidden leaks can saturate building materials, compromise structural integrity, cause timber rot, encourage black mould growth (which is a health hazard), damage underfloor heating and electrical systems, and significantly reduce property value. The cost of early leak detection is a fraction of the cost of remedying the structural damage a prolonged hidden leak can cause.
Suspect a Hidden Leak? Act Now.
Every day a hidden leak goes undetected, the damage gets worse. Call us now for a same-day leak detection survey across London.