Greenwich’s verified leak detection specialists find hidden leaks without unnecessary damage — using acoustic and thermal equipment before opening a single wall. A detection visit today prevents structural damage that worsens the longer a leak runs unseen.
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✅ Work guarantees available — confirm with your plumber
✅ Acoustic and thermal detection — SE3, SE7, SE9, SE10, SE18 & surrounding postcodes
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What is leak detection and when do you need it
Leak detection is the process of locating a water leak that is not visible — behind a wall, under a floor, beneath a screed, or within a concealed pipe run.
You need it when you can hear water running with everything turned off. When a water meter is moving with no taps open. When damp patches appear on walls or ceilings with no obvious source. When floors are warm in patches above underfloor heating. Or when your insurance company requires a professional trace and access report before authorising repair costs.
The distinction that matters: leak detection is diagnosis, not repair. Finding the leak and fixing it are two separate jobs. Detection establishes exactly where the leak is and what accessing it will involve — which determines whether the repair is a two-hour job or a two-day one.
Why leaks are harder to find in Greenwich properties
Greenwich’s housing stock creates specific challenges that do not apply to newer builds.
Victorian and Edwardian terraces across Woolwich, Charlton and Blackheath carry pipe runs in locations that made sense in 1902 and nowhere else — through solid brick walls, under suspended timber floors with limited access, inside chimney breasts, beneath later concrete overlays.
A leak in a non-standard location in a pre-1914 terrace requires acoustic detection equipment to pinpoint before anything is opened. Without it, a plumber is chasing sound through solid masonry.
Hard water compounds it. Thames Water classifies the water supply across Greenwich’s SE postcodes as hard water.¹ Limescale builds inside pipes and on fittings. In copper pipework, limescale accumulation is associated with pinhole leaks over time — a failure that can run for weeks behind a plaster wall in a Kidbrooke or Eltham property before damp appears on the surface, by which point the structural damage is already done.
For newer properties — particularly converted developments and modern flats in Thamesmead and Woolwich — underfloor heating pipe leaks are the most common detection job. Thermal imaging helps locate the failure point within the screed without breaking it open unnecessarily. Without thermal detection, an underfloor leak means lifting the entire floor to find a single failed joint.
Detection methods — acoustic, thermal and tracer gas
The method determines the outcome. A specialist who arrives with only one tool and uses it regardless of property type is guessing.
Acoustic detection uses sensitive listening equipment to identify the sound signature of a water leak through solid structures. Effective for supply pipe leaks in copper and lead pipework in Greenwich’s Victorian terrace stock. Note: acoustic detection is significantly less effective on plastic pipes, which absorb sound rather than carrying it — common in modern Woolwich Riverside and Thamesmead developments. A specialist experienced in Greenwich’s mixed stock will adapt their approach accordingly.
Thermal imaging helps locate temperature differentials in floors, walls and ceilings. The primary method for underfloor heating leaks — it maps the warm pipe run and helps identify the failure zone without breaking the screed.
Tracer gas detection injects a harmless gas mix into the pipe and uses a sensor to detect where it escapes through the leak point. Used for deep, small or otherwise undetectable leaks that acoustic and thermal methods cannot locate.
A properly equipped specialist uses the method appropriate to the property and the symptom — not just the one they have on the van.
Leak detection and your home insurance
Most buildings insurance policies cover escape of water as standard. The ABI noted in 2018 that trace and access cover is not always offered as standard, so you may want to check your current policy before booking — coverage terms may have changed since that guidance was published.²
Trace and access cover generally relates to the cost of locating and gaining access to a leak. Policy terms and sub-limits vary significantly between insurers — some will only pay out if the leak has already caused tangible damage to the property, not simply because a meter is moving. Always check your specific policy terms before commissioning work and notify your insurer before any work begins.
To make a trace and access claim: notify your insurer before commissioning work, use a qualified specialist who can produce a written report, and keep all invoices. Every specialist listed here can produce insurance-grade documentation — confirm this when booking if you intend to claim.
What to do before the specialist arrives
Turn off all water-using appliances and check your water meter. If the meter dial is moving with everything off, you have a confirmed active leak somewhere on the supply. Note where damp patches are, when they appeared, and whether they are growing — that information narrows the search area significantly.
Check your water meter at night before bed and again first thing in the morning without using any water overnight. If the reading has changed, you have an active leak on the supply side. This simple test confirms the leak is real before you book a specialist and rules out condensation or residual damp from a previous issue.
When the specialist arrives, let them take a brief history first — when it was first noticed, what has changed, whether there has been any recent plumbing work. That conversation shapes the detection approach before any equipment is switched on.
💡 Pro tip: Check your water meter last thing at night and first thing in the morning without using any water overnight. If the reading has changed, you have a confirmed active leak on the supply side. One number, two readings, zero doubt — and you walk into the specialist’s visit knowing the leak is real, not residual damp or condensation.
What leak detection costs in Greenwich — 2026
Typical London 2026 ranges. Actual costs vary by property type, detection method required and access. No official pricing data exists for private leak detection — always obtain multiple written quotes before work begins.
| Service | Typical London range 2026 |
|---|---|
| Trace & access diagnostic survey (acoustic/thermal) | £490–£695 |
| Thermal imaging survey only | £250–£399 |
| Tracer gas detection | £495–£695 |
| Minor visible leak repair (no investigative access) | £120–£180 |
| Access work (opening walls, lifting floors, cutting screed) | £150–£400+ |
Trace and access costs may be recoverable through home insurance where your policy includes trace and access cover — check your policy terms and notify your insurer before booking.d in the policy. Confirm with your insurer before booking.
Frequently asked questions — Leak Detection Greenwich
A moving meter with everything switched off confirms an active leak on the supply side somewhere between the meter and your taps. It is not condensation or residual damp — water is actively leaving the system.
Note the reading at night and again in the morning without using any water; if it has moved, the leak is confirmed and a specialist should be booked.
Depends on whether the source is obvious. A visible dripping joint or failed sealant around a fitting is a repair job — a plumber can fix it without detection equipment.
Damp with no clear source — no visible pipe, no recent plumbing work, no obvious cause — needs proper detection before anything is opened. Opening walls without knowing where the leak is wastes time and costs money.
Possibly — check your policy. The ABI noted in 2018 that trace and access cover is not always offered as standard.² Policy terms vary significantly between insurers — some require tangible property damage before they will pay a trace and access claim, not just a moving meter.
Notify your insurer before commissioning work and use a specialist who can provide a written report. Every specialist listed here can produce insurance-grade documentation — confirm this when booking.
In experienced hands, acoustic detection can locate a leak to within a few centimetres on copper or lead supply pipework. Accuracy reduces significantly on plastic pipes, which absorb rather than transmit sound — common in modern Greenwich developments in Woolwich Riverside and Thamesmead.
A specialist experienced in Greenwich’s mixed housing stock will use tracer gas or thermal methods where acoustic detection is unlikely to be effective.
In practice, a neighbour is not automatically liable for damage caused by a leak in their property. Liability typically requires negligence to be established — for example, that they knew about the leak and failed to act.
If negligence cannot be proven, the most practical route is often claiming on your own buildings insurance under escape of water cover. Document the damage with photographs and notify your insurer promptly.
Areas We Cover
Leak detection specialists on this directory cover the full Greenwich borough. Find local help below:
- Leak Detection North Greenwich
- Leak Detection Charlton
- Leak Detection Woolwich
- Leak Detection Eltham
- Leak Detection Blackheath
- Leak Detection Kidbrooke
- Leak Detection Abbey Wood
- Leak Detection Thamesmead
- Leak Detection Plumstead
- Leak Detection Shooters Hill
Related Services
A hidden leak in a Plumstead terrace wall and an underfloor leak in a Thamesmead flat need different detection methods, different equipment and different expertise.
The specialists listed here cover all three methods — acoustic, thermal and tracer gas — and carry insurance-grade documentation for every job. Work guarantees available — confirm with your plumber.
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Sources & further reading
¹ Thames Water — Hard water https://www.thameswater.co.uk/help/water-and-waste-help/water-quality/hard-water
² ABI — Is water damage covered by insurance? (2018) https://www.abi.org.uk/news/news-articles/2018/12/is-water-damage-covered-by-insurance/
Last reviewed: April 2026