Home/Leak Detection/Croydon
Croydon, London
Leak Detection Croydon
Hidden water leaks in Croydon pinpointed without opening floors or walls, acoustic, thermal imaging and tracer gas detection with no find, no fee, covering Croydon, Purley, Norbury, Thornton Heath and Coulsdon.
No find, no fee
You only pay the detection fee if we locate the leak.
All of Croydon
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 Croydon properties leak
Croydon housing is dominated by Victorian terraces, 1930s semis and high-rise conversions in the centre. Tall residential conversions in central Croydon mean riser and communal-main leaks that affect several flats at once and need fast isolation.
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 Croydon
- 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 Croydon
01
Communal riser leaks affecting several flats
In Croydon's tall office-to-residential conversions and newer residential towers, heating and water mains run vertically through shared risers behind boxed-in ducts. A weeping joint or corroded section high up tracks down through multiple floors, so the flat showing damage often sits well below the actual fault. We use acoustic correlation and thermal imaging on the riser to pin the source without opening every cupboard, then isolate the affected branch so unaffected flats keep their supply.
02
Shared cold-water supplies under split houses
Many Victorian and Edwardian terraces across Norbury and Thornton Heath have been divided into two or three flats fed from a single original supply pipe. When that ageing pipe fails under a hallway or party wall, two households lose pressure and neither can tell whose plumbing is at fault. We trace the buried run with acoustic and tracer-gas methods, establish exactly where the shared main leaks, and produce a clear report so responsibility and access can be agreed between occupiers.
03
Hillside pressure stress on interwar pipework
Purley and Coulsdon sit on rising ground, and mains pressure on the higher roads can be strong enough to work old compression joints and interwar galvanised runs loose over time. Leaks tend to appear at fittings under kitchens and downstairs bathrooms, often as a slow rise in the meter rather than visible water. We carry out a controlled pressure and flow check, then use ground microphones to locate the weeping joint under solid floors before any lifting begins.
04
Heating leaks lost under solid floors
Concrete ground floors, screed and later underfloor heating loops are common in Croydon's newer flats and refurbished houses. A pinhole in a buried heating pipe shows only as a pressure drop on the boiler gauge and a warm, damp patch that is hard to place. We combine thermal imaging with pressure testing and moisture mapping to fix the leak's position to a small area, so any breaking-out is kept to the minimum needed to reach and repair it.
What the data says about Croydon
How leaks behave in Croydon, and why
Long private supply pipes
Croydon is a borough of houses rather than blocks: 24.7% semi-detached, 23.3% terraced and 12.2% detached, with only 29% in purpose-built flats, close to the London median of 36.6%. More pipework runs underground and outside the building line here, across front gardens and beneath driveways, so the private supply pipe you are responsible for is simply longer than it is in a mansion block.
That changes the method rather than the price. Acoustic ground microphones and correlation along the buried run do the work a thermal camera does indoors, and pinpointing the spot is what keeps the excavation to a square metre rather than a trench.
Who supplies the water in Croydon
Water here is supplied by Thames Water, so a high-usage letter, the four-week repair window and any leak allowance claim all run through them. The pipe from the boundary stop tap into the property is yours, including the length under a garden or driveway.
What we detect
Leak detection services in Croydon
Home 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 Croydon
Also need an emergency plumber rather than detection? Emergency Plumber London →
Where we work
Croydon 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.
Coverage
Main postcode districts in Croydon
London postcodes were drawn for mail routing, not borough boundaries, so several of these run into neighbouring boroughs and a few edge districts are left off rather than claimed. If yours is not listed, we almost certainly still cover it, say the postcode when you call.
Leak detection in Croydon, FAQs
How quickly can you attend a leak in Croydon?
Same-day appointments are usually available in Croydon, 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 Croydon 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 Croydon detection visit, typically within 48 hours. They are structured the way UK loss adjusters expect.
Which parts of Croydon do you cover?
All of it, including Croydon, Purley, Norbury, Thornton Heath, Coulsdon. We cover every London borough and out to the M25, so coverage never depends on which side of a postcode line you live.
A leak in my central Croydon flat conversion seems to come from the flat above. What should happen first?
In tall conversions with communal risers, water often travels down through the structure, so the visible damage rarely marks the source. The priority is isolating the affected riser or stack to stop the flow, then tracing to confirm which pipe and flat is responsible before any finishes are opened. Getting an independent trace on record also helps when freeholder, managing agent and neighbouring leaseholders are working out who pays.
Does the higher ground in Purley and Coulsdon affect leaks in older houses?
Homes on the Croydon hillsides can sit on stronger mains pressure, which puts older joints, valves and worn fittings under more strain over time. In Victorian and 1930s properties that often means slow, hidden leaks under solid floors or behind render rather than obvious bursts. Non-invasive tracing locates the exact point first, so repairs stay targeted instead of lifting large areas. A typical trace is charged at a fixed hourly rate, usually £320 to £640 in total.
Read before you book
Leak detection guides
Leak Detection · 13 min read
How to Choose a Leak Detection Company in London (Without Getting Burned)
ReadPricing · 13 min read
The Real Cost of Cheap Leak Detection in London: A Buyer-Beware Guide
ReadLeak Detection · 12 min read
No Find, No Fee Leak Detection: What It Really Means (and the Small Print to Check)
ReadInsurance · 13 min read
Trace and Access Insurance Claims: A Step-by-Step Guide (2026)
ReadLeak Detection · 15 min read
10 Signs of a Hidden Water Leak at Home (and What to Do About Each)
ReadLeak Detection · 12 min read
How Leak Detection Actually Works: The Methods Explained
ReadLeak detection across London
Losing water in Croydon?
Tell us the symptoms and your postcode. Fixed hourly rate, expected duration, agreed arrival window, no find no fee, confirmed before you book.
Book a detection visit