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City of London, London
Leak Detection City of London
Hidden water leaks in City of London pinpointed without opening floors or walls — acoustic, thermal imaging and tracer gas detection with no find, no fee, covering Barbican, Bank, Moorgate and Aldgate.
No find, no fee
You only pay the detection fee if we locate the leak.
All of City of London
Same-day and next-day cover across the whole borough.
Insurer-ready reports
Trace & access documentation loss adjusters accept.
Multi-method survey
Acoustic, thermal, tracer gas and moisture on every visit.
Local knowledge
How City of London properties leak
City of London housing is dominated by the Barbican estate and commercial buildings with residential conversions. Concrete-frame buildings like the Barbican channel water along slab soffits, so the visible drip is rarely above the actual failed pipe.
Knowing the local building stock matters: it tells us where the pipework usually runs, which materials to expect, and which detection method will get to the answer fastest — before we arrive.
Covered in City of London
- Hidden leaks under floors and in walls
- Underground supply pipe leaks
- Central heating and boiler pressure loss
- Underfloor heating loop leaks
- Flat-to-flat leak origin investigations
- Trace & access reports for insurance claims
Three methods, one marked point
Acoustic survey
Ground microphones and correlators follow the sound of escaping water through floors and ground.
Thermal imaging
Infrared cameras reveal wet patches and buried heating runs through the floor surface.
Tracer gas
A safe hydrogen mix escapes through the exact failure point and rises to our surface detector.
What fails here
Common leak problems in City of London
01
Water tracking along concrete slab soffits
In the Square Mile's concrete-frame buildings, a failed pipe rarely drips directly below itself. Water runs along the underside of the structural slab, following the fall of the concrete until it finds a downstand, service penetration or light fitting to escape through. The stain in one flat can sit several metres from the actual break in the flat above. We moisture map the soffit to trace the water back to its true entry point before anyone opens up a ceiling.
02
Concealed riser leaks in tall blocks
Office towers and residential conversions run heating, cold water and drainage through shared vertical risers behind fire-rated shafts. A weeping joint or pinhole high in the riser feeds down through several floors, surfacing far below on a landing or in a lift lobby. Acoustic correlation and thermal imaging on the riser let us pin the leaking level without stripping cladding on every floor or shutting the whole stack down for days.
03
Conversion pipework hidden behind new finishes
Many City buildings were offices before being carved into flats. Original commercial pipework was often left in place and boxed behind fresh plasterboard, screeds and dry linings. Old solder joints, redundant capped branches and mismatched fittings then fail out of sight. We use tracer gas and thermal survey to follow buried runs behind the newer finishes, so the report identifies the exact failed section rather than the whole route.
04
Communal systems making the source unclear
Shared cold water tanks, pressurised heating loops and communal hot water plant mean a leak is often nobody's obvious responsibility. Pressure keeps dropping on the system but no single flat shows an obvious fault. We isolate and test each leg, pressure-test the loop and use correlation on buried mains to establish whether the loss sits in a private demise or communal plant, which settles the liability question for the managing agent.
From the forums
Leak Detection in City of London Concrete-Frame Flats
City of London residents often describe a frustrating pattern in leaseholder discussions on Reddit's r/HousingUK and building forums: water appearing on a ceiling or wall metres away from where it actually enters. In Barbican and Golden Lane concrete-frame flats, and in newer office-to-residential conversions, water tracks along slab soffits and communal risers before it drips, so the visible stain rarely marks the source. People report leaks that cross between flats, disputes over whether the fault sits in a communal riser or a demised pipe, and slow progress while a managing agent coordinates access to neighbouring units. A recurring theme is wanting an independent, non-destructive trace and a clear written finding, so the freeholder or managing agent can act and the right party's insurer can be approached without opening up finishes on guesswork.
What we detect
Leak detection services in City of London
Leak Detection
No find, no fee
Acoustic Detection
Listen. Locate. Repair.
Thermal Imaging
See through floors and walls
Tracer Gas
For the leaks nothing else finds
Underground Leaks
Locate before you excavate
Heating Leaks
Boiler pressure dropping? There’s a reason.
UFH Leaks
One tile up, not the whole floor
Trace & Access
Insurer-ready from the first visit
Leak Repair
Found. Fixed. Retested.
Areas we cover in City of London
Also need an emergency plumber rather than detection? Emergency Plumber City of London →
Where we work
City of London coverage map
Map data © OpenStreetMap contributors.
Don’t get caught out
How to Choose a Leak Detection Company in London (Without Getting Burned)
A plain-English buyer's guide to hiring a leak detection firm in London: why cheap hourly rates backfire, what real equipment looks like, how to read no-find-no-fee small print, and who is actually responsible for the pipe.
Leak detection in City of London — FAQs
How quickly can you attend a leak in City of London?
Same-day appointments are usually available in City of London, and next-day almost always. If water is actively escaping, tell us when you book — live leaks are prioritised and we can talk you through isolating the supply while an engineer travels.
Do you charge if you can’t find the leak?
No. Every detection visit in City of London is covered by our no find, no fee promise: if we attend a confirmed live leak and cannot locate it, the detection fee is waived.
Can you provide a report for my insurer?
Yes — trace and access reports documenting the cause, precise origin and affected areas are available for every City of London detection visit, typically within 48 hours. They are structured the way UK loss adjusters expect.
Which parts of City of London do you cover?
All of it — including Barbican, Bank, Moorgate, Aldgate. We cover every London borough, so coverage never depends on which side of a postcode line you live.
Why does a leak in a Barbican flat show up far from where the water starts?
Concrete-frame buildings let water run along slab soffits and structural voids until it finds a low point or a crack to emerge from, so the stain can be a room or a floor away from the source. We use non-destructive tracing, moisture mapping and thermal imaging to follow the path back to origin, rather than opening ceilings and walls at the point where you first see the damage.
Can you produce a report our managing agent and insurer will accept?
Yes. We provide a written trace-and-detect report with findings, images and the likely source, aimed at freeholders and managing agents who need to establish whether a communal riser or a demised pipe is responsible. A typical fixed detection fee runs around £250 to £450 as a UK trade cost-guide range. The report supports the responsible party's insurance claim without committing you to speculative works.
Read before you book
Leak detection guides
Leak Detection · 11 min read
How to Choose a Leak Detection Company in London (Without Getting Burned)
A plain-English buyer's guide to hiring a leak detection firm in London: why cheap hourly rates backfire, what real equipment looks like, how to read no-find-no-fee small print, and who is actually responsible for the pipe.
ReadPricing · 11 min read
The Real Cost of Cheap Leak Detection in London: A Buyer-Beware Guide
A low headline price for leak detection can end up the most expensive route of all. Here is how hourly billing, single-method surveys and non-compliant reports quietly inflate your final bill, and how to compare fairly.
ReadLeak Detection · 11 min read
No Find, No Fee Leak Detection: What It Really Means (and the Small Print to Check)
No find, no fee sounds like a safe bet, but the phrase means very different things depending on who you book. Here is how a genuine guarantee works, the carve-outs that quietly reintroduce charges, and the questions that protect you before anyone turns up.
ReadInsurance · 11 min read
Trace and Access Insurance Claims: A Step-by-Step Guide (2026)
Trace and access cover pays to find a hidden leak and put your property back together, but only under specific conditions. Here is how the cover works, what voids it, and how to run a claim from first notification to reinstatement.
ReadLeak Detection · 11 min read
10 Signs of a Hidden Water Leak at Home (and What to Do About Each)
A hidden leak rarely announces itself with a burst pipe. It shows up as a creeping bill, a warm patch on the floor, a musty smell you cannot place. Here are the ten signs worth taking seriously, what each one usually means, and the first sensible check to make before anything gets torn up.
ReadLeak Detection · 11 min read
How Leak Detection Actually Works: The Methods Explained
Acoustic, thermal, tracer gas, moisture mapping and pressure testing each find a different kind of leak. Here is what every method is genuinely good and bad at, why one tool on its own misses so much, and how a real survey moves from a damp patch to a marked repair point.
ReadLeak detection across London
Losing water in City of London?
Tell us the symptoms and your postcode. Fixed detection fee, agreed arrival window, no find no fee — confirmed before you book.
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