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Find a verified specialist to investigate a hidden leak across Putney SW15 — the damp patch with no obvious source, the water bill that jumped, or pressure that will not hold. Modern methods can narrow the likely source before targeted opening-up.
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Coverage: Putney SW15 — riverside, town centre, East and West Putney, Putney Heath and the Putney Lower Common edge. Confirm your postcode when you call.
What this covers: Tracing concealed leaks under floors, behind walls and in heating systems; supply-pipe leaks under gardens and drives; and distinguishing a genuine pipe leak from damp or groundwater before any excavation.
Where to go next: If a pipe has already burst and water is flowing, that’s a burst pipe or an emergency; this page is for the leak you can’t see.
Signs you have a hidden leak
- A water bill that’s climbed with no change in usage, or a meter that ticks over when everything’s off.
- A damp patch, blistering paint, staining or a musty smell with no obvious source.
- Boiler pressure that keeps dropping and needs topping up.
- Warm patches on the floor (a hot-feed leak), or the sound of running water when nothing’s on.
- Unexplained mould, or areas that never quite dry out.
How professional leak detection works
The point of specialist detection is to narrow the likely leak location before anything is opened up, reducing unnecessary damage. Results depend on the pipe material, construction, access and leak conditions, so opening-up may still be needed to confirm the source. Specialists combine several non-invasive methods:
- Acoustic detection — sensitive microphones pick up the sound of water escaping under pressure, even through concrete and screed.
- Thermal imaging — cameras map temperature differences to trace hot-feed leaks and wet areas under floors and behind walls.
- Tracer gas — a safe gas is introduced into an isolated pipe and detected where it surfaces, helping to narrow or indicate the likely leak location.
- Moisture mapping and pressure testing — to confirm the source and rule out condensation or damp being mistaken for a leak.
A good specialist explains the confidence level, methods used, likely repair area and any opening-up still required, and provides a written report rather than presenting an investigation as a guarantee.
The Putney flood and ingress question
Area-level flood information can identify possible sources of water, but it does not diagnose the cause at an individual property.
Riverside flood and ingress risk. Putney sits on the tidal Thames, and parts of the riverside are mapped by the Environment Agency in Flood Zone 3 for river or sea flooding.1 Flood Zone 3 does not establish a high groundwater table. Water entering a basement or ground floor may result from a pipe leak, surface-water ingress, drainage failure or groundwater where separate site or groundwater evidence supports it. The likely source should be established before excavation.
Concealed pipe leaks. Older copper or other pipework can develop leaks through corrosion, material condition, joints, damage or installation factors. Thames Water classifies the regional supply as hard and hard water can leave limescale deposits, but this does not establish a pinhole-leak mechanism.2 Acoustic, thermal, pressure and tracer-gas methods may help narrow the likely source.
Whose leak is it — and who pays?
A leak can be on the supply pipe, internal plumbing or a fitting. Thames Water is responsible for the main and communication pipe; the owner is normally responsible for the supply pipe and internal plumbing.3 A notification from Thames Water indicates suspected loss at the property, not the particular failed asset. Turn off all outlets and appliances, close the internal stop valve and retest the meter: continued movement indicates loss between the meter and the internal valve; no movement points to internal plumbing, fittings or usage that needs further checking. Tenants should report suspected leaks to their landlord.
Verified leak-detection specialists across Putney
Coverage varies by listing — confirm yours when you call.
Riverside — Embankment & Lower Richmond Road (SW15). Flood Zone 3 identifies river or sea flood probability, not groundwater level. Pipe leaks, surface-water ingress, drainage faults and groundwater should be distinguished using incident-specific evidence.
Putney High Street & Putney Bridge (SW15). Flats above shops and stacked flats, where a leak in one flat surfaces in another and tracing the true source saves opening the wrong ceiling.
East Putney & Upper Richmond Road (SW15). Terraces, conversions and mansion blocks may contain concealed or altered pipework; the cause and material condition must be diagnosed rather than attributed to hard water.
West Putney & Putney Heath (SW15). Where supply pipes run beneath gardens or drives, meter and internal-stop-valve tests should precede tracer work or excavation.
Putney Lower Common edge (SW15). Low-lying conditions may justify checking surface-water, drainage and groundwater evidence as well as the plumbing installation.
What leak detection costs in Putney
| Service | Typical range |
|---|---|
| Non-invasive leak detection survey | £200–£500 |
| Acoustic + thermal trace (concealed leak) | £250–£550 |
| Tracer-gas detection | £300–£600 |
| Supply-pipe leak location (external) | £250–£500 |
| Detection + report for insurance claim | £300–£600 |
| Located leak repair (from, access-dependent) | £150–£600+ |
Editorial estimate only, observed across independent leak-detection and WaterSafe contractors and directories in early 2026. Not regulated rates, not market data. Putney is inside the London-wide ULEZ but outside the central Congestion Charge zone.4 Some insurance policies include trace-and-access cover; check the policy wording and ask the specialist what evidence the report will contain. Figures are not a substitute for a written quote.
Frequently asked questions
Often, but not always without opening-up. Acoustic, thermal, pressure and tracer-gas methods can narrow the likely repair area; the exact source may still need to be confirmed through a targeted opening.
Both are possible. Flood Zone 3 identifies river or sea flood probability, not groundwater level. A specialist should compare plumbing tests with evidence of surface-water, drainage or groundwater ingress before excavation.
A meter that moves with all outlets and appliances off indicates water use or leakage that needs investigation. Close the internal stop valve and retest to distinguish the section between the meter and valve from internal plumbing or fittings.
Not necessarily. A Thames Water notification identifies suspected loss at the property, not the exact pipe. Use the meter and internal-stop-valve test before deciding whether the leak is on the buried supply pipe or internal plumbing. A confirmed private-side leak is the owner’s responsibility; Thames Water handles its main and communication pipe.
Some policies include “trace and access” cover. Check the wording, excess, limits and required evidence before commissioning work, and ask the specialist for a report recording methods, readings, photographs, likely source and recommended opening-up.
Why verified specialists — not a general directory
Leak detection is a skill worth paying for precisely because it saves you a bigger bill — so you want the basics confirmed. Every listing is checked before it goes live and re-verified annually: we confirm the business is legitimately trading and verify the named contact, we check evidence of public liability insurance, and we confirm coverage of Putney’s SW15 postcodes. Where gas work is involved we confirm Gas Safe registration with the Gas Safe Register, and you can check a plumber on WaterSafe. Profiles may be suspended or removed if credentials lapse — see the full verification process →.
Specialists pay a flat monthly listing fee. There’s no pay-to-play ranking and no per-enquiry middleman fee — your enquiry goes straight to the specialist you choose.
Related services
Related guides
The value of leak detection is a structured investigation: narrow the likely source, distinguish plumbing loss from other ingress, record the methods and confidence level, and limit unnecessary opening-up. Detection, opening-up, repair, drying and reinstatement may be separate scopes.
Contact a verified Putney leak-detection specialist ↑
_Last reviewed: July 2026 by Adiel Khan — SFEDI-accredited business advisor, 20+ years’ experience (South East Enterprise Ltd) and operator of VerifiedPlumbers. LinkedIn ↗_
This page is checked for compliance and regulatory accuracy against Thames Water, the Environment Agency, the Water Supply (Water Fittings) Regulations 1999 and TfL. Source links are provided within this page where relevant.
Sources & further reading
- Environment Agency — Check your long-term flood risk (Putney riverside river/sea flood mapping; Flood Zone 3 does not map groundwater level). https://www.gov.uk/check-long-term-flood-risk
- Thames Water — Hard water (regional supply classified hard; limescale only, not pinhole-leak causation). https://www.thameswater.co.uk/help/water-and-waste-help/water-quality/hard-water
- Thames Water — pipe responsibility and identifying leaks (main/communication pipe versus customer supply and internal plumbing; meter test with the internal stop valve). Pipe responsibility; identifying leaks.
- Transport for London — Ultra Low Emission Zone (London-wide since 29 August 2023). https://tfl.gov.uk/modes/driving/ultra-low-emission-zone