Emergency Plumbing & Boiler Repair · Pimlico, London
Leak Detection & Repair in Pimlico, London
A brown stain spreading across a ceiling, a damp patch on a basement wall, a water meter that keeps turning when every tap is off. London Boiler Repair, Plumbing arranges leak detection and repair across Pimlico, Victoria, Belgravia and Vauxhall by matching you, on 07380 899348, to an independently owned partner company with the tools to trace water without pulling walls apart.
Hidden leaks are the expensive kind. In a stucco terrace, pipework runs through lath-and-plaster walls, under floorboards and between floors that have been altered several times since Cubitt's builders laid out the grid from 1825. Where the stain appears is rarely where the water starts, so tracing comes before opening up.
Thames Water's own figures, as quoted by the water-quality site tapwater.uk, put the number of properties still connected by lead service pipes in its area at close to one million, and London's age is a big reason. If you suspect lead, the partner can tell you what to do about it.
The partner explains what it found, writes down the scope and price, and you decide before anything is cut. We text you the company's name beforehand.
What We Do
How a Hidden Leak Is Found
A methodical trace costs less than guessing and opening walls.
Meter and Pressure Tests
With every tap off, a water meter that still moves points to a leak on the supply side. A pressure test of the pipework isolates the leaking section, whether it is the incoming main, the cold feed or the heating circuit, and that narrows the search before any equipment is used.
Acoustic, Thermal and Moisture Tracing
Acoustic microphones listen for the sound of water escaping, thermal imaging shows warm leaks from heating pipes, and moisture meters map damp. In a Pimlico basement flat with old tanking and shared walls, combining the three narrows a leak to a patch small enough to open neatly.
Repair and Making Good
Once found, the partner repairs the pipe or joint, tests it and advises on drying out. Making good the plaster or boards is a separate matter that may need a decorator or builder, and the quote shows exactly what is and is not included.
Good to Know
Signs of a Hidden Leak
The earlier a leak is caught, the smaller the repair.
Inside the Home
Look for these first.
- Stains or bubbling paint on a ceiling or wall
- Damp or musty smells in a basement or lightwell
- Warm patches on a floor over heating pipes
- Falling boiler pressure with no visible drip
- Unexpected increase in a water bill
Outside and at the Meter
Check these too.
- A water meter that moves with all taps off
- A permanently wet patch on a pavement or yard
- The sound of running water when everything is off
- A drop in water pressure throughout the property
- Damp spreading up an external or party wall
Why Us
Tracing Leaks in Older London Property
Older buildings hide pipework, and the right approach is patient.
Non-Invasive First
The partner uses meters, microphones and imaging before cutting anything, protecting plaster and period joinery.
Honest About Lead
If lead pipework is present, the partner tells you and explains the options, including replacement, without pressure.
A Written Record of the Cause
A written note of the cause and repair helps with your own insurance claim.
A trace leads straight to a repair, and sometimes to wider work. See split pipe repair for failed pipes, plumbing emergencies when water is flowing now, and heating fault tracing when the leak is on a heating circuit. For boiler pressure problems, see boiler breakdowns. We cover Vauxhall SW8 across the river, and the jobs we arrange are all listed in one place.
What to Expect From a Leak Investigation
A leak investigation is a methodical job, and understanding the sequence helps you judge whether a partner is working sensibly.
Questions Before the Visit
The first call is about where the water shows, when it started and whether it changes with use. A stain that grows after a shower points to the bathroom, one that grows after the heating runs points to a heating pipe, and one that appears after rain suggests the roof or a wall. These answers shape which tests the partner brings.
Isolating the System
The partner tests whether the leak is on the cold supply, the hot supply, the heating circuit or the waste. Closing valves in turn and watching the meter or the boiler pressure narrows the possibilities quickly. In a flat, isolating one riser may need the managing agent's help, so tell us if the building has an agent.
Non-Invasive Tools
Thermal imaging shows warm patches where a hot or heating pipe is leaking, acoustic equipment listens for water escaping under pressure, and a moisture meter maps wet areas through plaster and floors. Together they usually narrow the leak to an area small enough to open neatly, which matters in a listed house where plaster and joinery are worth protecting.
Lead Pipes and Old Supply Pipes
Thames Water's own figures, as reported by tapwater.uk, put the number of properties in its area with lead service pipes at close to one million. A partner who finds lead tells you, explains the options and quotes for replacement if you want it. You can also ask Thames Water what it does about the section of pipe it is responsible for.
Opening Up and Making Good
When the leak is found, the partner opens the smallest area it can, repairs the pipe and pressure-tests it. Making good plaster, tiles or boards is separate work, and the written quote says what is included. In a rented flat, speak to the landlord before decorating or removing any finishes.
Drying and Follow-Up
Walls and floors can stay wet for weeks after a leak stops. Ask for a moisture reading at the end of the visit and another a few weeks later, and do not paint or refit flooring until readings are normal. If damp has caused mould or structural damage, the partner can suggest a specialist.
Costs and Responsibilities
What a Trace and Repair Costs
UK guides published in 2026 put tracing a concealed leak at £200 to £600, a straightforward accessible repair at £150 to £350 and a burst in a wall or floor at £400 to £1,000. The trace and the repair are quoted separately, because the cause is not known until the trace is done. The partner writes the price down before it starts each stage, and you decide whether to go ahead.
Who Is Responsible for the Leak
If the leak is on a pipe serving only your property, it is your responsibility, or your landlord's if you rent. If it is on a shared stack or riser in a flat, the freeholder or managing agent is usually responsible. If it is on the street main, it belongs to Thames Water. The partner explains which applies, and a written note makes it much easier to get the right party to act.
Why a Small Leak Deserves Attention
A slow leak costs little each day, but it rots timber, loosens plaster and feeds damp and mould, and in a stucco terrace it can reach structural timbers before anything shows on a ceiling. A trace done early is far cheaper than a repair done late. If your water bill has risen without a reason, or the meter moves with everything off, ring and ask.
Frequently Asked Questions
How much does leak detection cost in London?
UK guides published in 2026 put the cost of tracing a concealed leak at about £200 to £600, with repair extra and depending on access. Opening up a wall or lifting a floor adds time and making-good costs. The partner gives you a written price for the trace and a separate one for the repair once the cause is known.
How do I know if I have a hidden leak?
Turn off every tap and appliance, then check the water meter. If it keeps turning, water is escaping somewhere. Other signs include stains, damp patches, a musty smell, falling boiler pressure and rising bills. Ring 07380 899348 and describe what you see, and we will match a partner to attend. Take a meter reading before bed and another in the morning, which makes a slow leak visible.
Can you find a leak without ripping up the floor?
Usually, to a large degree. Acoustic detection, thermal imaging and moisture mapping narrow the leak to a small area, so only a small hole is needed. In a listed or period Pimlico house, protecting plaster, floorboards and joinery matters, and the partner explains what access is unavoidable before any cutting. Tell the partner where the floors are original so the least invasive route is chosen.
Is the leak my responsibility or the water company's?
Pipes inside your property boundary are your responsibility, while the supplier, for London generally Thames Water, is responsible for the main in the street. The service pipe between the two can be shared in some arrangements. A partner can usually tell you which side the fault is on, and you should report public-side leaks to Thames Water.
My heating pressure keeps falling, could it be a hidden leak?
Yes. If the boiler pressure falls week after week and you cannot see a drip, water may be escaping from a buried pipe, a joint under a floor or a radiator in a lower room. The partner can pressure-test the heating circuit, trace the leak and repair it, then reset the pressure to the manufacturer's figure.
Do old lead pipes cause leaks?
They can, and lead is also a health concern. Tapwater.uk quotes Thames Water's own figures that close to one million properties in its area still have lead service pipes, driven by London's age. A partner can identify lead pipework and discuss replacement, and you can also ask Thames Water about its lead pipe policy.
Will a leak affect my neighbours?
In a flat or terrace conversion, very probably, so it is courteous and sometimes necessary to tell them and the managing agent early. Water travels through floors and walls and can show up two storeys from the source. A written trace report makes it easier to establish where the leak began. Telling them early is courteous, and it also shows you acted promptly.
How long does leak detection take?
A straightforward trace might take an hour or two, while a difficult leak behind tanking or under a solid floor can take a half-day or more. The partner will give you an expected duration in the written quote, and may need to schedule a second visit for repair and drying checks. A second visit may be needed for the repair, and the partner explains this when it quotes.
What about damp afterwards?
Once the leak is stopped, the structure needs time to dry. The partner can advise on ventilation or drying equipment, and recommend a damp specialist if there is long-term damage. Do not decorate until moisture readings are back to normal, or the problem can reappear through the paint. Ask the partner for moisture readings at the end of the visit, so you have a baseline.
Who pays and who do I contact if the repair fails?
You pay the partner company directly on the terms in its written quote, and we do not take payment. If the repair fails, go to the partner first, then ring 07380 899348 and we will chase it. Your statutory consumer rights remain in place throughout. Keep the text naming the partner and the written quote, because both make a follow-up quicker.
Find the Leak Before It Finds the Ceiling
Pimlico, Victoria, Belgravia and Vauxhall. Call 07380 899348.
07380 899348