Detect · Locate · Repair
Leak Detection
London
Clear Flow Leak Detection finds hidden water leaks across all 32 London boroughs using non-invasive thermal imaging, tracer gas and acoustic methods — without the damage. Same-day response. Insurance-accepted reports.
Making The
Invisible Visible
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Non-Invasive Detection
Thermal imaging, tracer gas and acoustic equipment locate water leaks through concrete, timber and tile without damage to your property. No guesswork, no unnecessary excavation.
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Insurance-Ready Reports
Written report with photographs delivered within 24 hours, accepted by all major insurers for trace and access claims. We handle the documentation so your claim goes through first time.
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Same-Day Find & Fix
Qualified engineers carry detection kit and repair materials. Most water leaks located and fixed in a single visit across London, Surrey and Kent.
Leak Detection Services
Water Damage Restoration
Extraction, drying and full remediation after a leak.
Learn more about Water Damage Restoration
Central Heating Leaks
Pinhole leaks traced in sealed systems — no digging.
Learn more about Central Heating Leaks
Mains Water Leaks
Underground supply pipe leaks located fast.
Learn more about Mains Water Leaks
Underfloor Heating
Leaks found through concrete and tile — no excavation.
Learn more about Underfloor Heating
Boiler Leak Detection
Visible and concealed leaks fixed in one visit.
Learn more about Boiler Leak Detection
Ceiling Leak Detection
Inter-flat and party wall leaks, no ceiling ripped out.
Learn more about Ceiling Leak Detection
Mould Removal
Safe removal that treats the root cause, not just the mould.
Learn more about Mould RemovalYour leak may be
covered by insurance
Most home buildings insurance policies include trace and access cover, meaning your insurer pays for the cost of finding the leak, not just repairing it. We work with all major insurers, produce the documentation they require, and handle the process from first call to final report.
- Non-invasive water leak detection with minimal disruption to your property
- Full written report in insurer-accepted format
- Works with Aviva, AXA, Direct Line, LV= and all major providers
Advanced Detection Technology
Three complementary methods — used in combination to find any leak, anywhere.
Thermal Imaging
Infrared cameras detect heat signatures from hot water pipes beneath floors and inside walls. A fast, non-destructive first pass that covers large areas in minutes.
Learn about thermal imaging
Tracer Gas Detection
An inert hydrogen/nitrogen mix is introduced into the pipe system. It rises through concrete, timber and tile and is detected at the surface to pinpoint the exact leak location.
Learn about tracer gas
Acoustic Detection
Sensitive ground microphones pick up the frequency of water escaping under pressure, distinguishing a leak from background noise even through solid concrete.
Learn about acoustic detectionFrom Call to Fixed
Straightforward. No surprises.
Call or Book
Describe the issue and we'll advise the right approach. Same or next day in most cases.
Engineer Arrives
A qualified engineer brings the full detection kit — thermal, tracer gas, acoustic.
Leak Located
We pinpoint the exact source before any access work begins. No guesswork, no unnecessary damage.
Repair & Report
Leak repaired and full documentation delivered within 48 hours for your insurance claim.
All 32 London Boroughs & Beyond
London Boroughs & South East
One call covers the whole region. Based in London, typically on-site within 2 to 4 hours.
Trusted Across London
Absolutely quality service and what plumbers should exemplify. Turned up when they said, was kind, answered all my questions and wasn't being dodgy with anything. Skilful and efficient! Would highly recommend.
The technician arrived on time, was polite, and explained the process clearly before starting. They used advanced, non-invasive equipment to locate the leak quickly without causing any unnecessary damage to my property.
Really impressed with the service. They responded quickly and were able to accurately detect the leak without causing unnecessary damage. Professional, efficient, and clearly experienced — would highly recommend to anyone dealing with a hidden leak.
Wayne and his colleague came and within an hour found the leak deep underneath my cellar and came up with a perfect plan which made the pipe redundant and re-routed it the following morning. An excellent option if you're having a problem with a leak you cannot find.
Called Wayne Monday and he was round Tuesday evening — came out of hours to help me out. Very professional, punctual and great with communication. Fair priced too. Will definitely recommend and use again.
Contacted them and they were at the property within an hour. Honest, well priced and gave a detailed report that will likely save me hundreds of pounds. Will definitely recommend and if necessary will use again.
Wonderful efficient service — came out the same day, nothing was too much trouble. Engineers were professional and polite, explained the problem and persevered until the blockage was cleared. Would highly recommend this company.
The staff were so professional and friendly. The technician was nice and informative — he advised me the leak was outside and wrote me a report which I sent to Thames Water. In a few days they sent a repair team and found the leak. Clear Flow are great at what they do.
I received a letter from Thames Water about high water usage. Wayne arrived on time, was so professional, guided me through what he was doing and advised me of the next steps. He also wrote me a report to send to the water board. 100% recommend.
Frequently Asked Questions
Is leak detection covered by home insurance?
Most home buildings insurance policies include trace and access cover. This means your insurer covers the cost of locating the leak, not just repairing the damage. We produce an insurer-accepted written report after every job. Call us and we can advise whether your policy is likely to apply before you commit to anything.
What is trace and access?
Trace and access is an insurance term for the process of finding a hidden water leak (tracing) and accessing the area to expose it for repair. It covers the investigation cost: specialist equipment, labour and the written report, which your insurer pays if you have trace and access cover on your policy. We handle the full process from first visit to final documentation.
How quickly can you respond?
We offer same-day response for leak detection across Greater London, Surrey and Kent. For emergency situations such as active flooding or severe water damage, we can typically be with you within a few hours. Call us on 0203 886 2316 for an accurate arrival time.
How much does leak detection cost?
Costs depend on the type of leak and the methods required. Trace and access investigations covered by insurance typically cost you nothing out of pocket. For private investigations, we provide a clear quote before any work begins. Call or use our contact form and we'll give you an honest estimate based on your situation.
Which areas of London do you cover?
We cover all 32 London boroughs, plus Surrey and Kent. This includes Croydon, Bromley, Lewisham, Greenwich, Southwark, Wandsworth, Lambeth, Richmond and Kingston. If you are unsure whether we cover your area, call us. We almost certainly do.
GOT A LEAK?
WE'RE READY.
Same-day and emergency appointments available across London and the South East. Most leaks found and fixed in a single visit.