Non-destructive leak detection in Clapham using acoustic, thermal imaging and tracer gas equipment — locate hidden leaks under floors, behind walls and in screeds without ripping the property apart.
Non-destructive leak detection in Clapham using acoustic, thermal imaging and tracer gas equipment — locate hidden leaks under floors, behind walls and in screeds without ripping the property apart.
Related: Mains water leak repair & water main replacement · Stopcock & valve repair
Non destructive leak detection means we find the leak before anyone lifts a floor. Acoustic, thermal and tracer-gas equipment narrows the loss to a small area, so the repair opening is measured in centimetres rather than metres across Clapham properties.
A calibrated thermal imaging camera reads the temperature difference a leak creates in screed, plaster and timber. Thermal imaging leak detection is the fastest route to hot-feed and heating leaks, and produces images we include in the written report.
Acoustic leak detection uses ground microphones and a correlator to hear pressurised water escaping. It works through concrete, tile and buried ducting, and pinpoints mains and cold-feed losses that leave no visible trace.
Unexplained high water bills, damp patches, sinkholes in a driveway or a meter that turns with every tap closed all point to a supply-side loss.
Buried supply pipes are traced and surveyed with tracer gas and correlation, so the excavation is limited to the failure point. Hidden leaks inside walls, ceiling voids and under floors are located the same way.
We test the incoming main, isolate at the stopcock to separate internal from external losses, and where the main has failed we can replace it — see our water main replacement and lead pipe repair service.
A heating system that keeps losing pressure is leaking somewhere, even when nothing shows on the surface.
Pressure-drop testing, thermal survey and where required a leak-sealing assessment identify weeping joints, corroded rads and buried pipe failures on central heating circuits in Clapham.
Underfloor heating leak detection combines thermal imaging over the screed with manifold circuit isolation, so we can name the failed loop and repair or bypass it without lifting the whole floor.
Hidden Leak Detection is the kind of work where the difference between a good plumber and a poor one shows up months, not minutes, after the invoice. A push-fit fitting bodged behind plasterboard, a soil-pipe joint that isn't properly solvent-welded, a compression olive over-tightened onto old lead-lined copper — none of these fail immediately, but every one of them turns into an insurance claim within a year. When you book hidden leak detection with us anywhere in Clapham, the engineer who attends is directly employed, DBS-checked, fully insured to £5 million public liability and — where the job touches gas — Gas Safe registered.
That employed-only model is why we can offer a written workmanship guarantee on every water leak detection job and honour it without argument. It also means the person who diagnoses your fault is the person who fixes it, so there is no "the surveyor said one thing, the engineer said another" moment on the day. Across Clapham and the surrounding postcodes we run stocked long-wheelbase vans carrying compression fittings, push-fit spares, WRAS-approved brassware, common boiler PCBs, drain rods, high-pressure jetting kit and colour CCTV — enough to first-time-fix the majority of hidden leak detection calls without a second visit.
You get a fixed price agreed before we start, an itemised invoice on completion, photographs of any concealed work and a copy of any pressure-test, tightness-test or CCTV video for your records. Landlords, managing agents and letting agents in Clapham routinely use these packs directly with their insurers, buildings insurers and — where relevant — the housing tribunal.
The first call is answered by a UK-based coordinator, not an overseas call centre. They will confirm your postcode in Clapham, ask a short set of triage questions (is water actively flowing? is the stopcock accessible? is there gas involved?) and either dispatch an engineer immediately for an emergency or book you in at a specific hour rather than a four-hour "window". You will receive an SMS with the engineer's name and live ETA.
On arrival the engineer isolates the affected supply, protects flooring and furniture, and diagnoses the fault. For water leak detection that usually means one of a small number of failure modes, and we will explain what has failed, why, and what the two or three sensible repair options are — rather than defaulting to the most expensive. Everything gets a fixed written price before a spanner is turned. If a part needs to come from a merchant, most Central London and Home Counties merchants are within a 30-minute round trip; for less common parts we quote a return visit rather than sit on the clock.
On completion we pressure-test the affected section (or drop-test the drain, or tightness-test the gas), take before-and-after photographs, clean down the work area and issue a written invoice with the workmanship guarantee period clearly stated. You do not pay a penny until you have signed off the job on site.
Every hidden leak detection job we complete in Clapham and the surrounding postcodes carries a written workmanship guarantee. Replacement parts carry the manufacturer's warranty, which for boiler components is typically 12 to 24 months and for brassware, valves and pumps 12 months as a minimum. Where the work involves Gas Safe notifiable installations we submit the Building Regulations notification to Gas Safe Register on your behalf and the certificate arrives at the property by post within ten working days.
Our public liability cover is £5 million and our employer's liability is £10 million — the certificates are on the van and we are happy to share them with any managing agent or insurer who asks. For commercial clients we can also provide method statements, RAMS, permit-to-work compliance and out-of-hours access arrangements as standard, at no extra cost, when the works are booked in advance.
We operate 24/7, 365 days a year across Clapham. Overnight, weekend and bank holiday call-outs use the same employed engineers as our weekday service — you are never handed over to a subcontractor at midnight — and the out-of-hours labour rate is quoted before we set off, never applied retrospectively.
Call or book online for hidden leak detection in Clapham. We'll confirm scope and a fixed price.
A fully insured local plumber attends at the agreed time with a stocked van — most jobs are fixed on the first visit.
Work is completed to WRAS / Water Regs / manufacturer spec and you get a written invoice, photos and our workmanship guarantee on the day.
Pricing depends on the scope of work, parts required and time on site. Our engineer will quote a fixed price before any work starts at your Clapham property — no surprises on the invoice.
Yes. Every engineer is fully insured (£5m public liability), DBS-checked and — for any boiler or gas work — Gas Safe registered. We send the right qualified person for hidden leak detection in Clapham.
For genuine emergencies we aim to be on site in Clapham within the hour, 24/7. For pre-booked work, same-day or next-day slots are usually available across Clapham and the surrounding areas.
Yes — all plumbing repairs come with a workmanship guarantee, and replacement parts carry the manufacturer's warranty. For boiler repairs the parts & labour guarantee is 12 months.
Yes. We work in homes, flats, HMOs, restaurants, offices, shops and managed buildings across Clapham and the surrounding areas — including landlords, letting agents and facilities companies.
If your supply is metered, water escaping through a leak after the meter will normally register on your bill. However, your water supplier may offer a leakage allowance, subject to its rules and evidence that the leak has been repaired. Contact the supplier promptly, record meter readings and keep repair paperwork. Ask about wastewater charges too if the leaked water did not enter the sewer. Responsibility for repairing the pipe depends on its location and ownership.
The best water leak detection equipment depends on the leak rather than a particular brand. Moisture meters help map dampness, thermal cameras show temperature differences, and acoustic equipment helps locate pressurised pipe leaks. Tracer gas is useful for some concealed leaks that are difficult to hear. Pressure testing helps identify which section is losing water. A combination of methods is usually more useful than one device, because no instrument reliably pinpoints every leak through every building material.
Start by drying accessible pipework and checking joints, valves, appliance hoses and the areas beneath sinks. Water can travel along pipes or joists, so the visible damp patch may be far from its source. Check whether leaking coincides with rain, heating use or draining a fixture. If water is actively escaping, turn off the internal stop tap if safe. Keep clear of wet electrics and do not puncture a bulging ceiling; concealed leaks may need professional tracing.
A reliable DIY underground leak detector is difficult to make, but a simple meter test can help establish whether water is escaping. Turn off taps and water-using appliances, allow cisterns to finish filling, then note the meter reading and check again after a period without use. Movement suggests a leak or unnoticed demand, not its exact location. Look for persistent wet patches along the pipe route. Avoid digging blindly or attaching homemade electrical probes to buried services.
Plumbers use water meter checks, pressure gauges, moisture meters and acoustic listening equipment to investigate leaks. Thermal cameras can reveal temperature patterns associated with dampness or leaking heating pipes, but they do not see directly through walls. For concealed or underground leaks, tracer gas and acoustic correlators may help narrow the search. An engineer usually starts by isolating sections and checking accessible fittings before choosing specialist equipment, helping distinguish a supply leak from drainage problems or condensation.
Yes, specialist tools can detect underground water leaks without immediately digging up the pipe. Ground microphones amplify leak noise, and acoustic correlators estimate its position using sensors placed at separate points. Tracer-gas equipment detects gas escaping from a pipe that has been prepared for testing. A water meter can help confirm that water is being lost, but it cannot pinpoint the leak. Detection accuracy depends on pipe material, burial depth, pressure and surrounding conditions.
For finding a leaking underground water pipe, there is no single best device. Acoustic ground microphones are useful when escaping water creates a clear sound; leak correlators help pinpoint leaks between accessible pipe locations. Tracer gas can be more suitable for quiet leaks or some plastic pipes. Groundwater surveying is a different task from plumbing leak detection. For a suspected supply-pipe leak, choose the detection method around pipe material, depth, access and background noise rather than buying a universal detector.
Plumbers find underground pipe leaks by checking water meter movement, isolating sections of pipework and using specialist equipment to narrow down the location. Acoustic microphones listen for escaping water, while correlators compare sound travelling along a pipe. Tracer gas can help where leaks are difficult to hear. The best method depends on pipe material, depth and ground conditions. These checks reduce unnecessary digging, although excavation may still be needed to confirm and repair the leak.
Our engineers can handle any of the works below in the same visit across Clapham.
Round-the-clock emergency plumbing in Clapham — burst pipes, sudden leaks, no hot water and overflowing toilets. Engineer dispatched within the hour, 365 days a year.
Fast burst pipe repairs in Clapham — we isolate the water supply, locate the failure and complete a permanent repair the same visit. Copper, plastic and lead pipework.
Blocked drains cleared fast in Clapham — high-pressure jetting, rodding and electro-mechanical clearing for foul drains, gullies, rainwater stacks and external runs.
Same-day unblocking of toilets, soil pipes and macerators in Clapham. Whether it's a single WC backing up or a whole stack venting back into the property, we'll clear it fast.
Professional drain jetting in Clapham for stubborn blockages, fat build-up, root ingress and routine drain maintenance — domestic, commercial and contractor work.
CCTV drain surveys in Clapham — pre-purchase home buyer reports, recurring blockage investigations and pre-build condition surveys with full written report.
Yes — while our engineer is at your Clapham property for hidden leak detection, they can usually carry out leak detection, drain clearing, tap or toilet repairs and boiler checks in the same visit, saving you a second visit.
Yes. Every service listed below is delivered by our own employed engineers throughout Clapham and the surrounding postcodes — no subcontractors, no agency cover.
Yes. Tell us what you need when you book and we'll send a single fixed written quote covering hidden leak detection plus any additional plumbing or drainage works at your Clapham property.
Gas Safe engineers on call 24/7 across Greater London and the M25. Pick your area for local response times, arrival windows and same-day availability.
London (all boroughs) · same-day cover · fixed hourly rates
Central London · same-day cover · fixed hourly rates
East London · same-day cover · fixed hourly rates
West London · same-day cover · fixed hourly rates
North London · same-day cover · fixed hourly rates
South London · same-day cover · fixed hourly rates
Our Clapham engineers also cover these neighbouring areas on the same shift pattern.
91 London boroughs, towns and M25 areas covered 24/7. Jump straight to local response times and availability for hidden leak detection in your area.
All the services below can be carried out on the same visit as your hidden leak detection in Clapham.
Round-the-clock call-outs for burst pipes, leaks and lost water.
LEAKThermal imaging & acoustic location of buried leaks.
DRAINHigh-pressure jetting and rodding for foul and surface drains.
BOILGas Safe repairs for all major boiler brands, same day.
CCTVColour CCTV surveys with insurer-ready written report.
TAPMixer cartridges, washers and thermostatic valve repairs.
On the same visit in Clapham we can also handle leak detection, blocked drains, boiler repairs, CCTV drain surveys, tap and shower fixes — anything in the emergency plumbing and drainage scope.
Yes. Landlords and managing agents in Clapham get a dedicated coordinator, consolidated monthly invoicing, photo-documented job reports and a 24/7 emergency line for tenants.
Yes. For leak detection, drain surveys and flood-related work we provide a written report with photos and (where applicable) CCTV video — accepted directly by household and commercial insurers.
Our local emergency plumbers are on call 24/7 across London. Fully insured, Gas Safe registered where required, with fast response times day and night.
24/7 emergency response • All London postcodes