The water stain on your ceiling is rarely above the leak. Good leak detection finds the source without tearing the house apart looking for it — and in Ealing’s converted and period homes, that skill earns its fee.

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Leak surveys are typically quoted as a fixed fee or first-visit rate — and trace-and-access may be covered by your home insurance, so check your policy before you book.

Contact verified leak detection plumbers in Ealing ↓

Coverage: W3, W5, W7, W13, UB1, UB2, UB5 and UB6, plus the NW10 fringe around North Acton and Park Royal.
What this covers: hidden leaks — under floors, behind walls, in ceilings, on heating circuits, on supply pipes — found with minimal damage.
Not this page: water actively pouring through a ceiling is an emergency plumber job; a pipe that’s visibly burst is burst pipes; damp from outside or drains is often blocked drains territory.
Costs: survey fees vary by method and access — see what it costs.
Availability: detection is usually a booked visit, not a blue-light callout — most plumbers schedule surveys in normal hours.

Jump to: Signs of a hidden leak · How leaks are found · Leaks in Ealing homes · Whose leak is it? · By district · Costs · FAQs

Signs you’ve got a hidden leak

Hidden leaks announce themselves indirectly: a damp patch or tide mark that grows, paint bubbling, a musty smell, mould in a corner that was always fine, skirting or flooring that’s swelling, or a cold-water pressure drop nobody can explain. On heating systems, the giveaway is a combi boiler that keeps losing pressure and needing topping up — that water is going somewhere. A warm patch on a solid floor can mean a leaking heating pipe in the screed. Don’t overlook the quiet one either: Thames Water says a leaky loo — water trickling or rippling at the back of the bowl — can waste an average of around 400 litres a day.⁸

If you’re on a water meter, the meter is your best detective. Thames Water’s published check works by bracketing: take a meter reading, wait without using water, and read it again — if the two readings differ with the inside stop valve closed, the leak sits between the meter and the inside stop valve.⁸ Run the same idea with the valve open and every tap and appliance off, and movement means water is escaping somewhere in the house instead. On a metered supply, a hidden leak isn’t just damage — it’s water you’re paying for, which is why it’s worth confirming early rather than watching the bill climb.

And one caution before anyone reaches for tools: the stain is a clue, not a map. Water travels — along joists, down pipe runs, across the back of plasterboard — and routinely surfaces a room away from where it escaped. Opening the ceiling under the stain is how people end up with two holes and no leak.

How professional leak detection works

Modern detection is about narrowing the search before anything is opened. The toolkit varies by plumber, but the usual methods are: moisture mapping with meters to trace how far the water has spread and in which direction; thermal imaging to spot the temperature signature of a leaking hot or heating pipe behind a surface; acoustic listening equipment to pick up the sound of pressurised water escaping; tracer gas, where a harmless gas is introduced into the suspect pipe and detected where it escapes; and pressure testing of individual circuits — cold supply, hot supply, heating — to isolate which system is losing water before any floorboard comes up.

A note on what these tools can and can’t do: tracer gas and acoustic methods work best on pressurised pipework — they’re for live supply and heating circuits, not every damp problem. If the evidence points instead to rainwater ingress, condensation or a waste-pipe fault, the next step is a different test or a different trade, and a straight plumber will say so rather than keep searching.

The sequence matters as much as the kit: a methodical plumber isolates circuits first, narrows the area second, and opens up last — and only where the evidence points. When you’re comparing quotes, ask which methods are included, whether the fee covers a written report (insurers usually want one), and what happens if the leak isn’t found on the first visit.

The repair itself is often the small part. Once found, a weeping joint or pinholed section is usually a contained fix — see burst pipes in Ealing for what repair involves when a pipe has properly let go.

Why Ealing homes hide leaks well

Many Ealing homes make leaks genuinely hard to trace — above all the period houses, the conversions and the blocks with concealed risers. The borough’s older streets — the Victorian and Edwardian stock of Ealing, Acton and Hanwell — have suspended timber floors, voids, and a century of pipework alterations layered on top of each other, so water can travel a long way along joists before it shows. The converted period houses found around Ealing Broadway and West Ealing add another layer: one building, several flats, pipework crossing between them, and a stain in one flat that started in another. In estate blocks, the leak may not be in any flat at all but on a communal riser or stack.

Older supply pipes raise a different question. Thames Water sets out the ownership split: you own the internal pipework and the supply pipe from the outside stop valve to the inside one; the water company owns the communication pipe from the main to your boundary — and many older properties are served by a shared supply pipe, which is the joint responsibility of you and your neighbours to maintain and replace.¹ A leak on that buried run between the pavement and your kitchen is still your side of the line — and on older shared-supply streets, finding it can involve more than one household.

One more Ealing wrinkle: this is a split-supply borough. The council’s Infrastructure Delivery Plan maps drinking water as divided between Affinity Water across much of the west and Thames Water in the east² — so if a confirmed leak sits on the company’s side of the boundary, the company you report it to depends on who bills the property.

Whose leak is it?

Homeowner: everything inside, plus the supply pipe out to the outside stop valve, is yours¹ — and before commissioning a survey, check your home insurance: many policies include trace and access cover, which pays for locating the leak and the making-good of whatever had to be opened, separately from the pipe repair itself. Cover varies between policies, so ask your insurer before the survey, not after, and keep the written report.

In a flat: establish whether the suspect pipework serves only your flat or the building. Communal risers, stacks and shared pipework sit with the freeholder or managing agent — and in council blocks, with Ealing Council, reported through the council’s repairs route on 0800 181 744 or 020 8825 5682 out of hours.³

Renting privately: report the signs to your landlord promptly — under Section 11 of the Landlord and Tenant Act 1985, landlords must keep in repair and proper working order the installations for water supply, sanitation, space heating and heating water⁴ — and hidden leaks only get more expensive with time, which is an argument the landlord should appreciate.

Council tenant: report it to Ealing Council rather than booking privately — repairs to council homes go through the council’s own routes.³

Find a verified leak detection plumber by district

Acton (W3, parts NW10). The detection contrast here is sharp: in the period terraces, water tracks through floor voids and surfaces rooms away; in the new Acton Gardens blocks⁵, pipework is concealed in service voids and behind boarded ducts by design — different buildings, same need to find before opening.

Ealing (W5, W13). Conversion territory. In a W5 conversion, a bath waste or heating pipe in the upstairs flat can stain the ceiling below long after the water has tracked along joists — so detection starts by proving which flat, and which circuit, is actually involved. In the subdivided period houses around the Common, the Broadway and West Ealing, that first question often matters more than any single gadget.

Greenford (UB6, parts UB5). In the Golf Links estate’s maisonette blocks and towers⁶, the suspect list includes communal risers and stacks as well as flat pipework — worth establishing early, because responsibility (and who pays for the survey) changes with the answer.

Hanwell (W7). The older streets around Hanwell Broadway, with the suspended timber floors typical of Victorian-era construction, are a gift to travelling water: a leak at one end of a joist run can stain plaster at the other. Methodical isolation and moisture mapping beat exploratory holes here every time.

Northolt (UB5). In the post-war blocks and maisonettes found across Northolt, pipework tends to be concentrated in shared ducts and risers, so a damp patch can have a communal cause — while the newer council-led apartment schemes have per-flat systems where isolation testing narrows things fast.

Perivale (UB6). Perivale grew up largely in the interwar years — its landmark Hoover Building dates from 1932 — and where plumbing hasn’t been renewed since, original runs can be buried in solid floors or hidden behind decades of redecoration. A pressure-loss test on the heating circuit is a common first step when a warm patch appears on a Perivale floor.

Southall (UB1, UB2). Above the Broadway and South Road parades, flats and food premises can share rear pipework and structures, so “whose water is this” is a genuine detection question — and in larger or extended households, more bathrooms and appliances mean more candidate circuits to isolate and test.

What it costs

Leak detection pricing usually has two parts: the survey (finding it) and the repair (fixing it) — and if insurance is involved, trace-and-access may cover the first part plus making good. Ask up front: is the survey a fixed fee, what methods does it include, is a written report provided, and is the repair quoted separately once the leak is located?

Editorial estimate only, for orientation. These are NOT regulated rates, NOT market data and NOT a published cost survey — survey scope, access and methods vary widely. Always get a written quote.

There is no official price list for leak detection in Ealing. Local cost context: Ealing is inside London’s ULEZ⁷, and half the borough’s road network sits in controlled parking zones² — a parking permit cost a plumber may pass on for a longer survey. For quote anatomy, see how to read a plumbing quote.

Frequently asked questions

Why verified plumbers — not a general directory

Leak detection is a trust purchase: you’re paying someone to tell you where to open up your own home, and the bill depends on believing the diagnosis. That’s why every listing here is checked before going 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 the plumber covers Ealing’s W and UB postcodes before a profile is approved.

For water-fittings work you can also look any plumber up yourself on WaterSafe, the free, water-industry-backed national register. And where the diagnosis or repair involves the gas boiler itself or any other gas work — a pressure-losing combi being the classic trail — we confirm registration directly with the Gas Safe Register; HSE is clear that work on the gas boiler itself must be done by a Gas Safe registered engineer.⁹ Profiles may be suspended or removed if credentials lapse or credible concerns are raised — see the full verification process →

There’s no pay-to-play ranking of listings and no customer middleman fee: enquiries go directly to the plumber.

Related areas

Verified leak detection plumbers across Ealing’s neighbourhoods, including:

• Acton
• Brentham Garden Suburb
• Central Greenford
• Dormers Wells
• Ealing Broadway
• Ealing Common
• East Acton
• Greenford
• Greenford Broadway
• Hanger Hill
• Hanwell
• Hanwell Broadway
• Lady Margaret
• Montpelier
• North Acton
• North Ealing
• North Greenford
• North Hanwell
• Northfields
• Northolt
• Northolt Mandeville
• Northolt West End
• Norwood Green
• Perivale
• Pitshanger
• South Acton
• South Ealing
• Southall
• Southall Broadway
• Southall Green
• Southall West
• Walpole
• West Ealing

Related services

Other verified plumbing services in Ealing:

• Emergency Plumber in Ealing
• Burst Pipes in Ealing
• Blocked Drains in Ealing
• Toilet Repairs in Ealing
• Tap Repair & Installation in Ealing
• General Plumbing in Ealing
• Bathroom Plumbing in Ealing
• Kitchen Plumbing in Ealing
• Washing Machine & Dishwasher Installation in Ealing
• Boiler Repair in Ealing
• Boiler Installation in Ealing
• Boiler Servicing in Ealing
• Central Heating Repair in Ealing
• Commercial Plumbing in Ealing

Related guides

• How to Find Your Stop Tap (London Homes)
• London Hard Water — The Complete Homeowner & Landlord Guide 2026
• London Plumbing Costs & Compliance Guide 2026
• Victorian Terrace Plumbing Guide — London 2026

In Ealing’s layered housing — period floors, conversions, estate risers, buried supply pipes — the stain and the source are rarely in the same place. The verified leak detection plumbers listed above find the second before opening the first, and a written report turns the finding into something your insurer will act on.

Contact verified leak detection plumbers in Ealing ↑

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Last reviewed: June 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 the regulations and bodies cited on this page, including Section 11 of the Landlord and Tenant Act 1985, HSE guidance under the Gas Safety (Installation and Use) Regulations 1998, Thames Water, Ealing Council and Transport for London. Source links are provided within this page where relevant.

Sources & further reading

1. Thames Water (supply pipe and communication pipe responsibility; shared supply pipes) — https://www.thameswater.co.uk/help/water-and-waste-help/water-quality/lead-pipe-replacement
2. Ealing Council Infrastructure Delivery Plan, Part One: Infrastructure Baseline Report, Feb 2024 (water supply split; CPZ coverage) — https://www.ealing.gov.uk/download/downloads/id/19508/part_one_infrastructure_baseline_report.pdf
3. Ealing Council (reporting a housing repair) — https://www.ealing.gov.uk/info/201093/repairs_-_council_property/2742/reporting_a_housing_repair
4. Landlord and Tenant Act 1985, Section 11 (landlord repairing obligations) — https://www.legislation.gov.uk/ukpga/1985/70/section/11
5. Ealing Council (South Acton Estate regeneration) — https://www.ealing.gov.uk/info/201104/housing_regeneration/377/south_acton_estate
6. Ealing Council (Golf Links estate — about the estate) — https://www.ealing.gov.uk/site/scripts/documents_info.php?documentID=372
7. Transport for London (Ultra Low Emission Zone) — https://tfl.gov.uk/modes/driving/ultra-low-emission-zone
8. Thames Water (identifying leaks — meter check, leaky loos) — https://www.thameswater.co.uk/help/water-and-waste-help/leaks/leaks-at-home/identifying-leaks
9. HSE (who can carry out gas work — Gas Safe Register) — https://www.hse.gov.uk/gas/domestic/newschemecontract.htm