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Lewisham, London
Leak Detection Lewisham
Hidden water leaks in Lewisham pinpointed without opening floors or walls, acoustic, thermal imaging and tracer gas detection with no find, no fee, covering Lewisham, Catford, Deptford, Forest Hill and Blackheath.
No find, no fee
You only pay the detection fee if we locate the leak.
All of Lewisham
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 Lewisham properties leak
Lewisham housing is dominated by Victorian and Edwardian terraces with period conversions. Back-addition kitchens and bathrooms in Victorian terraces concentrate pipework in one damp-prone corner, a frequent hidden-leak hotspot.
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 Lewisham
- 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 Lewisham
01
Back-addition pipework leaks in Victorian terraces
Lewisham's Victorian and Edwardian terraces almost all carry a rear back-addition holding the kitchen and bathroom, which concentrates supply pipes, waste runs and heating flow-and-return in one narrow corner. When a joint weeps behind the units or under the boarded floor, the water tracks along the party wall and shows as damp two rooms away. We moisture-map that corner and use acoustic and thermal tracing to find the true source before anything is opened up.
02
Shared supplies feeding split period conversions
Many terraces across the borough are split into two or three flats served by one original rising main and shared waste stacks. A leak on the top-floor supply often surfaces in the ground-floor ceiling, and neither leaseholder can tell whose pipe is at fault. We trace the shared supply run non-invasively, isolate each branch by pressure testing, and confirm ownership so the right party and the right insurer are involved from the start.
03
Concealed heating leaks under solid and screeded floors
Refurbished kitchens and rear extensions frequently bury heating pipes and manifolds in screed or under engineered flooring. A slow drop in boiler pressure with no visible puddle usually means a buried joint or a nicked pipe under the screed. We thermal-image the floor to map warm loss, then confirm with tracer gas so the leak is pinpointed to a small area rather than lifting an entire new floor.
04
Rainwater and drainage defects mistaken for plumbing leaks
On older Lewisham stock, blocked or cracked below-ground drains, failed rear gullies and defective flat-roof outlets over back additions push water into walls that reads exactly like an internal plumbing leak. Getting this wrong means chasing the wrong pipe for weeks. We separate rainwater and drainage faults from pressurised supply leaks using dye testing, CCTV where needed and moisture profiling, so the report names the real defect.
What the data says about Lewisham
How leaks behave in Lewisham, and why
Lewisham is one of the most flatted places in the country
39.1% of Lewisham homes are in a purpose-built block, close to the London median of 36.6% and 14th of 331 local authorities nationally. Water leaving a pipe on an upper floor does not surface on that floor. It runs along a joist, drops through a service void, and shows up in a different flat entirely.
At this density the question is almost never "where is the water" but "whose pipe is it", and that argument is settled by a survey rather than by whoever complains loudest. We isolate and pressure test before a ceiling is opened, because here the cost of a wrong guess lands on a neighbour.
Converted houses and retrofitted pipework
16.3% of the stock here is converted or shared houses, well above the London median of 8.8%, ranking 10th of 331. A house split into flats carries pipework threaded through a building never designed to hold it: waste boxed into an original chimney breast, supply chased through lath and plaster, a bathroom sitting over what used to be a bedroom.
Those retrofits are where slow leaks sit, and the runs are rarely where anyone expects. We trace them rather than assume them, which is the difference between lifting one board and lifting a room.
Communal heating changes what a pressure drop means
2.7% of households here run on a district or communal heat network, above the London median of 2.3% and 16th of 331. On a communal system a falling pressure reading is not your boiler, and often there is no boiler in the flat to look at. The loss can be anywhere on a shared circuit, including outside your own front door.
Isolating your section from the riser answers that inside the first hour, which is worth knowing before anyone lifts a floor you may not be responsible for.
When the repair is your landlord's to arrange
29.2% of Lewisham households are social rented, well above the London median of 21% and 14th of 331. Where that applies the repair is usually the landlord's or the housing association's, and what moves it up a queue is a written location and cause. A report naming the pipe, the position and the evidence is much harder to defer than a phone call about a damp patch.
Who supplies the water in Lewisham
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 Lewisham
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 Lewisham
Also need an emergency plumber rather than detection? Emergency Plumber London →
Where we work
Lewisham 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 Lewisham
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 Lewisham, FAQs
How quickly can you attend a leak in Lewisham?
Same-day appointments are usually available in Lewisham, 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 Lewisham 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 Lewisham detection visit, typically within 48 hours. They are structured the way UK loss adjusters expect.
Which parts of Lewisham do you cover?
All of it, including Lewisham, Catford, Deptford, Forest Hill, Blackheath. We cover every London borough and out to the M25, so coverage never depends on which side of a postcode line you live.
My Forest Hill house has damp on a hillside wall. Is it a leak or the ground?
Hillside properties around Forest Hill and Honor Oak can show damp from ground moisture as well as from plumbing, so the two are easy to confuse. Non-invasive tracing, using moisture readings, thermal imaging and acoustic checks, helps establish whether a pressurised pipe is losing water before any wall is opened. Detection is charged at a fixed hourly rate of £160 that does not rise on the day, and a typical survey runs two to four hours, so £320 to £640 in total.
There's a leak between two flats in a Lewisham conversion. Who is responsible?
In converted flats around Deptford and central Lewisham, shared or ambiguous supply runs make it hard to know which home a leak sits in. Locating the exact source first gives both parties clear evidence, which usually helps resolve who pays under the lease or between insurers. We focus on finding and confirming the source; responsibility itself depends on your lease terms and any freeholder or managing agent arrangements.
Read before you book
Leak detection guides
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Losing water in Lewisham?
Tell us the symptoms and your postcode. Fixed hourly rate, expected duration, agreed arrival window, no find no fee, confirmed before you book.
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