Leak detection,
done right.
London’s leak specialists. We pinpoint hidden leaks with thermal imaging and acoustic equipment — no unnecessary drilling, digging, or guesswork.
Do you actually
have a leak?
Six warning signs that it is time to call a leak detection specialist before the damage — and the repair bill — gets worse.
Boiler losing
pressure
If your boiler pressure keeps dropping after you top it up, there is almost certainly a leak somewhere in your central heating system that needs locating and repairing.
Damp patches
Unexplained watermarks on walls or ceilings are a strong indicator of a hidden water leak.
Higher water bills
A sudden unexplained increase often points to a hidden leak you cannot see.
Mould or mildew
Persistent mould in corners or around windows signals hidden moisture from a slow leak.
Dripping sounds
Hearing water running when all taps are off almost always means a pipe leak.
Warm spots on the floor
Unexplained warm patches on the floor — particularly if you do not have underfloor heating — almost always mean a hot water pipe is leaking beneath the surface. Our thermal imaging cameras pick this up instantly.
Think You Have a Leak? Don’t Wait.
The longer a leak goes undetected, the worse the damage gets. Call us today for a fast, non-destructive inspection.
Our Detection Methods
We use a combination of advanced technologies to locate leaks accurately and without causing any damage to your property.
Thermal Imaging
Our advanced thermal imaging cameras detect temperature differences behind walls, under floors, and in ceilings. Water leaks create distinct thermal signatures that are invisible to the naked eye but clearly visible on our infrared equipment. This allows us to pinpoint the exact location of a leak without opening up any surfaces.
Acoustic Detection
Our specialist acoustic listening equipment amplifies the sound of water escaping from pipes, even through concrete, soil, and thick walls. By analysing the frequency and intensity of the sound, our engineers can pinpoint the precise location of underground and hidden pipe leaks without any excavation.
Pressure Testing
We isolate sections of your plumbing and heating system, then pressurise them to identify exactly which circuit has the leak. Pressure testing is particularly effective for central heating leaks, underfloor heating leaks, and mains water supply issues where the leak source is not immediately obvious.
Trace & Access
Our trace and access service locates the source of a leak and provides the minimal access needed to carry out a repair. We use a combination of all our detection technologies and provide a detailed written report with photographs — ideal for insurance claims where you need evidence of the leak location.
Every kind of leak.
One company.
Water, gas, boiler, central heating, underground, thermal — our leak specialists have the kit and certifications to handle every call-out across London.
Find the leak before
the damage spreads.
Thermal imaging, acoustic listening, and moisture mapping — we pinpoint hot & cold water leaks without tearing up floors, walls, or ceilings.
Gas leak detection & repair
Gas Safe registered rapid response — we locate it, isolate the supply, and issue a Gas Safe certificate.
Boiler leak detection
Losing pressure? We diagnose the exact cause — pump, heat exchanger, expansion vessel, or pipework.
Central heating leak detection
Radiators, pipework, underfloor heating, manifolds — pressure tested and thermal imaged without stripping out finished floors.
Thermal imaging leak detection
High-resolution thermal cameras reveal hidden moisture behind tiles, plaster, and screed. Accepted by every major UK insurer.
Underground leak detection that saves your driveway.
Tracer gas, correlation acoustics, and ground microphones pinpoint underground pipe leaks so we dig a hole, not a trench.
Specialist Leak Detection In Detail
Every leak is different. Here is how our leak detection specialists approach each type of leak we are called out to across London.
Water Leak Detection Service
A hidden water leak can waste hundreds of pounds a month and cause serious structural damage long before you see a patch on the ceiling. Our water leak detection service combines thermal imaging, acoustic listening equipment, moisture mapping, and pressure testing so we find the leak first time — not after three return visits.
We regularly locate slow leaks on hot and cold feeds, bath waste leaks, concealed shower traps, burst push-fit fittings under kitchen islands, and failed compression joints beneath suspended floors. Whether it is a new-build apartment or a Victorian townhouse, the approach is the same: non-destructive plumbing leak detection, a fixed quote, and a written leak inspection report you can hand to your insurer.
- Hot and cold water pipe leak detection
- Shower tray, wet room, and bath waste leak tracing
- Communal riser and stack leak investigation
- Leak repair services carried out on the same visit where possible
Typical water leaks we find
If you smell gas
- 1. Turn off the gas at the meter if it is safe to do so.
- 2. Open all doors and windows to ventilate the property.
- 3. Do not switch electrical appliances, lights, or plugs on or off.
- 4. Leave the property and call the National Gas Emergency line on 0800 111 999.
- 5. Once the area is safe, call our Gas Safe engineers for gas leak repair and certification.
Gas Leak Detection Services & Gas Leak Repair
A suspected gas leak is a safety emergency and should never be left. As a Gas Safe registered leak detection company, we offer rapid-response gas leak detection services for domestic and commercial properties across London — from simple hob connection leaks to complex gas carcass faults hidden inside solid walls.
Our engineers use electronic gas detectors, tightness tests, and leak detection fluid to pinpoint the exact location of the leak. We then carry out a full gas leak repair, re-pressurise the system, and issue a Gas Safe certificate confirming the installation is safe to use.
- Gas Safe registered leak detection specialists
- Tightness tests and leak location on domestic & commercial systems
- Full gas leak repair with Gas Safe certification
- Emergency response 24/7 across London
Boiler & Central Heating Leak Detection
If your boiler pressure keeps dropping and you are topping up the filling loop every few days, there is almost certainly a leak on the heating system. Our boiler leak detection and central heating leak detection service identifies whether the leak is inside the boiler, on the pipework, or on the radiator circuit — before any flooring comes up.
We isolate sections of the system using pressure testing, thermal image the pipework runs, and inspect the boiler internals for failed pump seals, auto air vents, expansion vessels, heat exchangers, and diverter valves. You get one report that explains exactly where the leak is and what the leak repair will cost.
- Boiler internal component leak diagnosis
- Radiator and TRV leak tracing
- Underfloor heating leak detection on wet systems
- Manifold and zone valve investigations
Warning signs on your boiler
Where we dig
We mark the exact location of the leak on the ground with spray paint before any excavation. That means a 300mm access hole instead of a trench across your driveway — saving hours of labour and hundreds of pounds in reinstatement costs.
Underground Leak Detection & Underground Pipe Leak Detection
A leaking mains supply pipe is one of the hardest leaks for a general plumber to find — and one of the most expensive if they get it wrong. Our underground leak detection service uses correlation acoustics, tracer gas, and ground microphone surveys to identify underground pipe leaks beneath driveways, patios, lawns, and paving without guesswork.
We work directly with water companies, insurers, and loss adjusters on underground leak detection and repair. Once the leak is pinpointed, we provide a written report with photographs and, where instructed, carry out the excavation and repair with full reinstatement.
- Tracer gas underground leak detection
- Correlation acoustics for mains water supply pipes
- Excavation and full leak detection and repair
- Written reports for water company rebates & insurance
From call to repair,
in four steps.
No runaround, no vague call-outs. Here is exactly what happens when you book a leak detection specialist.
Call us
Call 24/7 or request a quote online. We respond within the hour and book your engineer visit at a time that works for you.
Engineer arrives
A specialist arrives fully kitted out with thermal cameras, acoustic gear, tracer gas, and moisture meters.
Detect & locate
Using non-destructive methods we pinpoint the exact leak location. You get a written report with photographs.
Repair & report
Same-visit repair wherever possible, backed by a 12-month guarantee and a full report for your insurance claim.
Ready to start?
Rated 5.0 by 110+ Google reviews
Transparent Pricing
No hidden fees. We quote before we start so you know exactly what you are paying.
Basic Inspection
Visual inspection with moisture meters to identify the source and severity of a suspected leak.
- Moisture meter survey
- Visual assessment
- Written report provided
Full Detection
Comprehensive leak detection using thermal imaging, acoustic equipment, and pressure testing.
- Thermal imaging scan
- Acoustic listening equipment
- Pressure testing
- Detailed report with photos
Emergency Detection & Repair
Same-day emergency leak detection and repair in a single visit. Ideal for urgent situations.
- Same-day emergency response
- Full detection suite included
- Repair on the same visit
- 12-month repair guarantee
Trusted by
homeowners,
insurers &
everyone
in between.
Six reasons BeFix is the leak detection company London turns to when the pressure’s dropping and the ceiling is about to go.
“Turned up within two hours of calling, found the leak behind our kitchen wall in under 30 minutes. Polite, tidy, and the report was perfect for our insurer.”
-
01
Gas Safe & NIC certified
All our engineers are Gas Safe registered and NIC certified. We are also TrustMark approved, so every job meets the highest industry standards.
-
02
Non-destructive methods
Thermal imaging, acoustic equipment, pressure testing — no unnecessary drilling, digging, or tile removal. Your property stays intact.
-
03
Insurance-ready reports
Detailed written reports with photographs documenting the leak location, cause, and repair — accepted by every major insurer for trace & access claims.
-
04
Same-day emergency response
Available 24/7 for emergency leak detection. Leaks don’t wait for convenient times, and neither do we — same-day response across London.
-
05
Detect & repair in one visit
Our engineers carry repair kit and common parts, so we can usually detect and fix the leak in a single visit — saving you time and money.
-
06
12-month repair guarantee
Every repair we carry out is covered by a full 12-month parts and labour guarantee. If the same leak returns, we come back and fix it for free.
Emergency Leak Detection Specialists
When a leak is actively damaging your home or business, every hour matters. Our emergency leak detection team is on standby 24 hours a day, 7 days a week for urgent call-outs across Greater London. We arrive fast, locate the leak, isolate the supply, and start the repair — one call, one company, one visit.
Whether it is a ceiling coming down in a first-floor flat, a running mains supply under a driveway, or a suspected gas leak you can smell in the kitchen, our emergency leak detection service handles it end-to-end: detection services, leak repair services, insurance report, and reinstatement.
Rapid Response
Leak detection engineer dispatched within the hour for active emergencies.
Gas Safe Certified
Qualified for emergency gas leak detection and gas leak repair.
Full Kit On Board
Thermal cameras, acoustic gear, and leak repair parts on every van.
Insurance Reports
Trace and access reports ready for your claim.
Our leak detection vans are fully kitted out
Thermal cameras, acoustic listening gear, pressure test rigs, tracer gas, borescopes, and a full set of plumbing and gas repair parts — every BeFix van arrives ready to detect and repair the leak on the same visit.
Recent Leak Detection Jobs
Real jobs completed by our Gas Safe engineers across London.
Boiler Losing Pressure
Leak DetectionBoiler pressure issue identified, fault repaired, and system tested to ensure safe operation.
Smell Of Gas
Leak DetectionGas leak identified, repaired, and system tested to ensure safe operation.
Central Heating
Leak DetectionCentral heating leak identified, repaired, and system tested to ensure safe operation.
Live Google Reviews
See what real customers say about BeFix on Google.
Leak Detection FAQ
Everything you need to know about our leak detection service.
Our leak detection service starts from £79 for a basic inspection with moisture meters. A full detection using thermal imaging and acoustic equipment starts from £149. Emergency same-day detection and repair starts from £199. We always provide a fixed quote before starting any work.
No. We use non-destructive methods including thermal imaging cameras, acoustic listening equipment, and moisture meters to locate leaks without damaging your property. Only minimal access is required for the actual repair once the leak has been located.
Yes. Our acoustic listening equipment can detect leaks in underground pipes by picking up the sound of water escaping through soil and concrete. Combined with pressure testing, we can accurately locate underground mains water leaks, drainage leaks, and buried heating pipework leaks.
Yes. We provide a detailed written report with photographs documenting the leak location, the detection methods used, and the repairs carried out. Our reports are accepted by all major insurance companies and are specifically designed to support trace and access claims.
In most cases, yes. Our engineers carry repair equipment and common plumbing parts on their vans, so once we have located the leak, we can often repair it there and then. This saves you the cost and inconvenience of a second visit. All repairs come with a 12-month guarantee.
Very likely, yes. Boiler pressure loss is one of the most common signs of a leak in the central heating system. The water is escaping somewhere — often under the floor or behind a wall where you cannot see it. Our pressure testing and thermal imaging will quickly identify the source.
Yes. We offer a 24/7 emergency leak detection service across London. If you have an active leak causing damage, call us and we will have an engineer with you as quickly as possible — usually within a few hours. Emergency detection and repair starts from £199.
We cover all 32 London boroughs and surrounding areas. Whether you are in Central, North, South, East, or West London, our engineers can be with you quickly. We also cover parts of Hertfordshire, Essex, Kent, and Surrey that border Greater London.
London’s Leak Detection Experts
Professional leak detection, leak inspection, and leak repair services — delivered by engineers who do this every day.
BeFix is a dedicated leak detection company serving homeowners, landlords, managing agents, commercial property owners, and insurance panels right across London. Our engineers are true leak detection specialists — this is not a side service. Every day they use thermal imaging leak detection, acoustic correlation, tracer gas, pressure testing, and targeted moisture mapping to solve leaks that less-specialist plumbers have already given up on.
Whether you need water leak detection for a pinhole on a copper pipe, gas leak detection services for a suspected carcass leak, boiler leak detection for a pressure-loss fault, central heating leak detection for a wet underfloor circuit, or underground leak detection for a leaking mains supply beneath your driveway, we have the equipment, the experience, and the certifications to handle it. One call, one company, one leak detection and repair service.
What makes us the leak detection specialist of choice?
Three things set a professional leak detection service apart from a general plumber. First — kit. Our vans carry high-resolution thermal imaging cameras, digital acoustic listening equipment, tracer gas kits, borescopes, correlation units for underground pipe leak detection, and moisture meters calibrated for plaster, screed, and timber. Second — experience. You learn to read a leak signature the way a doctor learns to read an X-ray. Our leak detection expert team sees hundreds of leaks a year, so patterns jump out fast. Third — process. We always quote first, use non-destructive methods by default, and write up every leak inspection in a clear report you can show to your insurance company.
A leak detection service built for insurance claims
If you are claiming on your home insurance for a water leak, the insurer will almost always need a trace and access report from a qualified leak detection company. We produce those reports as standard on every job. Each report includes the engineer’s findings, thermal images, moisture readings, the exact location of the leak, the suspected cause, and the recommended leak repair. Our reports are accepted by every major UK insurer for trace and access claims — because they are written by Gas Safe registered, NIC certified engineers who understand what a loss adjuster needs to see.
Non-destructive leak detection — why it matters
An older leak detection approach meant taking up floors, knocking through plasterboard, and hoping you guessed right. Modern professional leak detection does the opposite. Using thermal imaging leak detection and acoustic equipment, we map out the leak source before we touch a single tile. The result is that the repair becomes surgical — a single access point, a single joint replaced, and a floor that goes back down in the same afternoon. That saves you money on the repair itself, on redecoration afterwards, and on the stress of living in a building site for weeks.
Plumbing leak detection for every property type
We handle plumbing leak detection for everything from studio flats to six-bedroom homes, from converted warehouses to commercial kitchens. Each property has its own quirks — solid concrete floors, suspended timber, sprayed screed, underfloor heating, communal risers, party walls — and those quirks change which detection method works best. Our engineers choose the right approach for your building, not a one-size-fits-all script. That is what a proper leak specialist service looks like.
Leak repair services you can rely on
Detection is only half the job. Our engineers carry the tools, fittings, and consumables to carry out most leak repair services on the same visit. That includes pipe repairs on copper, plastic, and MDPE, radiator valve replacements, boiler component swaps, and minor gas leak repair under Gas Safe certification. For larger repairs — such as underground pipe replacement or full bathroom waste re-plumbs — we provide a fixed written quote before starting any additional work. Everything we repair is backed by a 12-month parts and labour guarantee.
Areas we cover for leak detection in London
We provide leak detection services across all 32 London boroughs and the home counties immediately surrounding Greater London. Common call-out locations include Westminster, Camden, Islington, Hackney, Southwark, Lambeth, Wandsworth, Hammersmith & Fulham, Kensington & Chelsea, Richmond, Kingston, Merton, Sutton, Croydon, Bromley, Lewisham, Greenwich, Bexley, Barnet, Enfield, Haringey, Waltham Forest, Redbridge, Newham, Tower Hamlets, Havering, Barking & Dagenham, Ealing, Hounslow, Hillingdon, Harrow, and Brent. We also cover areas of Hertfordshire, Essex, Kent, and Surrey that border Greater London.
If your postcode is inside the M25, we can almost certainly get a leak detection specialist to you the same day. Call our team to confirm availability — or request a quote online and we will come back to you within the hour during working hours.
Ready to book a leak detection specialist?
Professional leak detection from £79. Emergency same-day response across London. Full written reports for insurance claims. 12-month repair guarantee on every leak repair we carry out.
Stop the Damage Before It Gets Worse
Professional leak detection from £79. Non-destructive methods, same-day emergency response, and a 12-month repair guarantee. Call us now or request your free quote online.