247 Rapid Response
4.5 · 510 reviews
247 Rapid Response engineer at the rear of a fully-kitted emergency response van on a London street at night

Emergency plumbing

Hidden water leak repair across London

A pipe weeping behind a wall or under the floor often shows up as a creeping damp patch, a musty smell, or a water bill that keeps climbing. Our directly-employed, fully insured plumbers find the source and fix it properly, typically reaching London and M25 emergencies in 30 to 60 minutes.

30 to 60 min target response12-month guaranteeGas Safe Registered
30-60 MINResponse time
12 MOWorkmanship guarantee
FULLYInsured & accredited
24/7365 days a year

The hardest leaks to deal with aren't the bursts, they're the slow ones. A pinhole leak under a kitchen floor can run for six months before you smell the damp. A failing radiator-valve packing weeps for two years until the floorboard gives way. A failing immersion-heater seal drips quietly into a roof void until the ceiling stains.

Hidden leaks need a methodical approach: precise location first, then minimum-destruction access, then permanent repair, then drying-out and restoration. Most general plumbers do step three. We do all four, backed by insurance-grade reporting and direct insurer billing on covered claims.

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When We Use This

Where this service applies

  • ✅ Pipework leaks under solid screed floors
  • ✅ Concealed leaks behind tiled walls (kitchens, bathrooms)
  • ✅ Above-ceiling leaks (typically from flat above in leasehold blocks)
  • ✅ Underfloor heating circuit failures
  • ✅ Boiler-circuit leaks on buried pipework
  • ✅ Radiator valve and joint weeps
  • ✅ Hot water cylinder seal failures
  • ✅ Persistent damp of unknown origin
Our Process

How we deliver

No surprises, no upselling. The exact path every job follows.

  1. 1
    Site assessment & symptom mapping
    Customer history, moisture readings, visible damage scope.
  2. 2
    Multi-method leak location
    Thermal imaging, acoustic detection, moisture mapping, tracer gas, combined as required.
  3. 3
    Insurance-grade report
    Located leak documented for insurer claim, covered under trace-and-access on most policies.
  4. 4
    Controlled access cut
    Precise minimum-size access to expose the leak.
  5. 5
    Permanent repair
    Pipework replaced or rejoined. Pressure tested at operating pressure.
  6. 6
    Drying-out monitoring
    Moisture content checks until substrate is verified dry.
  7. 7
    Restoration coordination
    Replastering, tiling, decorating, flooring, handled end-to-end on covered claims.
  8. 8
    Final claim closure
    Documentation, settlement, insurer paperwork, all closed cleanly.
Frequently Asked

Your questions answered

How do you find a leak you can't see?
Combination of methods. Thermal imaging visualises temperature differences caused by water. Acoustic listening picks up the sound of pressurised water escaping. Tracer gas escapes through any leak point and is detected with ultra-sensitive probes. Moisture mapping establishes the extent of damage. Together they pinpoint hidden leaks to within 100mm before any access cut is made.
How much does hidden leak repair cost?
Trace-and-access investigation is priced per our published rate card (see full pricing), usually covered by home insurance. There is no callout fee for emergency work, so you pay only for the labour at the rate for the time of day, plus any materials. Labour runs from £75 / 30 min (daytime) up to £147 / 30 min (nighttime) (see /pricing), with materials at trade cost + 30%, itemised. Restoration scope quoted separately.
Is the trace-and-access work covered by my insurance?
Most UK home insurance policies include £5,000,£10,000 of 'trace and access' cover specifically for the work of finding the leak source. We provide the report format insurers require and can bill them directly on your behalf.
How long does the entire process take from leak found to property restored?
Typical timeline: Day 1: trace, access, repair (often same-day). Days 2,14: drying-out monitoring (moisture-content checks). Days 14,28: restoration work (plastering, tiling, decorating). Total typical: 3,6 weeks for a moderate damage event.
Do you really handle restoration for free on covered claims?
Yes, when restoration is included on your insurance claim, we carry out the work and bill the insurer directly. The customer pays nothing out of pocket on covered restoration. Full details →
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Need a 24/7 emergency engineer?

30 to 60 minute response across every London borough. Gas Safe registered. 12-month workmanship guarantee.

FAQ

Hidden water leak repair: your questions

How fast can you reach me for hidden water leak repair?
Typical on-site time is 30 to 60 minutes across the M25, subject to engineer availability and traffic. Live dispatch, never queued. Times quoted are best-effort targets, not contractual guarantees.
What does hidden water leak repair typically cost?
Labour is one flat rate across London and the M25, billed per 30 minutes: from £75 / 30 min (daytime) up to £147 / 30 min (nighttime), with a one-hour minimum then 30-minute increments. There is no callout fee. Domestic prices shown inc VAT, no hidden extras. Fixed-price conversion available on most jobs after diagnosis. Full rate card.
Is the work guaranteed?
Yes. Hidden water leak repair carries the same 12-month workmanship guarantee as every other emergency plumbing job we do.
Are you Gas Safe registered?
Yes. Gas Safe Register number 972173. Verifiable live at gassaferegister.co.uk before our engineer walks in.

Need hidden water leak repair now?

30 to 60 minute response across every London borough. Gas Safe registered. 12-month workmanship guarantee.