Plumbing · Croydon, London
Leak Detection & Repair in Croydon, London
A leak you can see is half the story. A stain that spreads on a ceiling, a water meter that creeps with every tap closed, a patch of warm floor or a smell of damp in a back bedroom all point to a pipe that is losing water out of sight. [Proper Plumber Croydon](/) answers on 07898 116196 at any hour and matches the independently owned partner company best placed to trace it.
The right order is find, confirm, then open up. Published figures show how that pays: Croydon basic leak repairs run roughly £105 to £160, standard repairs £160 to £265, and a concealed leak that needs floorboards lifted and thermal imaging £265 to £575. UK-wide, a domestic leak survey is most often quoted at £150 to £750. The partner company confirms its own price in writing before starting.
Croydon tap water is very hard, measured at 308 mg/l as calcium carbonate in the Croydon East supply area in 2025. That scale hardens compression joints and clogs valve seats, so older Victorian pipework in Addiscombe and Woodside weeps at joints long before it bursts. In the flat blocks near East Croydon station, the leak you can see is often a symptom of one in the flat above.
Work is built to the Water Supply (Water Fittings) Regulations 1999 and BS EN 806, with WRAS-approved fittings. If the trace shows the leak is in a shared pipe or the water supplier's side of the boundary, the partner company says so before you pay for a repair that is not yours.
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What We Do
How a Leak Gets Found
Three levels of detective work, used in rising order of cost and disruption.
Visible and Accessible
A dripping joint under a sink or a weeping radiator valve needs no survey, just a repair. The partner company checks the surrounding pipework too, because one scaled joint rarely lives alone. This is the basic end of the Croydon range, typically around £105 to £160.
Hidden Inside Walls and Floors
When the stain is far from the cause, the partner company uses a moisture meter and thermal imaging to find the cold or wet line before cutting anything. Where pipes run under floorboards in a Victorian terrace, a small, targeted opening beats a lifted room. See burst pipe repair when the pipe has split rather than weeps.
Underground and Under Slab
A water meter that moves with every tap shut points to a leak in the supply pipe between the boundary and the house. Acoustic and tracer-gas methods locate it, at published costs that run well above a surface repair. We tell you the likely cost range before the survey, not after.
The Benefits
Why Finding Before Fixing Pays
Guesswork costs floors.
A Smaller Hole
A traced leak means a patch the size of a hand, not a stripped room. Plasterwork, tiles and carpets stay where they were.
One Repair, Not Three
Chasing a stain across a ceiling can mean replacing the wrong joint twice. A confirmed source means the right joint is replaced once.
A Clear Line of Blame
A trace shows whether the water is from your pipe, a neighbour's, the building's riser or the supplier's main, which settles who pays.
Good to Know
Is Water Escaping?
Quick checks you can do without tools.
Signs of a Hidden Leak
Any one of these deserves a call.
- A water bill or meter reading that climbs with no explanation
- A brown stain or bubbling paint on a ceiling or wall
- Warm patches on a floor over heating pipes
- A musty smell in a cupboard, cellar or under the stairs
- The sound of running water when every tap is off
The Meter Test
A simple check before you ring.
- Turn off every tap and appliance in the house
- Note the water meter reading and the time
- Wait for at least thirty minutes without using water
- Read it again; any movement suggests a leak
- Tell us the result on the call so we can match the partner
Why Us
Leaks Across Croydon's Housing Mix
Where the pipes are, the leak follows.
Addiscombe: Joints and Scale
The Victorian terraces of the East India Estate have old copper and mixed-age repairs, and hardness of 308 mg/l scales joints and stopcocks. A seized stopcock turns a small leak into a bigger one.
East Croydon: Shared Risers
Newer flat blocks around Cherry Orchard Road run shared stacks, so a ceiling stain may start next door. The partner company checks with the managing agent when the source is not yours.
Shirley: Interwar Pipework
1930s semis typically have copper pipes and an airing-cupboard cylinder, with loft tanks in some. Overflow pipes dripping outside are a common early sign.
Leaks sit between a small repair and a flood. If water is already pouring, go to emergency plumbing, and if a drain is the culprit read blocked drains. Browse all our services for related jobs.
What Leak Detection Means
Leak detection is the process of locating where water is escaping from a pressurised pipe, heating circuit or waste, before repair begins. It is not a repair in itself, though the two often run together on the same visit.
A competent trace follows the manufacturer's instructions and the principles in BS EN 806 for water installations in buildings. A repaired joint should be tested at working pressure before any floor or wall is closed.
What Changes the Cost
Access
A pipe behind a bath panel costs less to reach than one under a fitted kitchen or in a screed. Thermal imaging and acoustic equipment are charged for the time they take.
Making Good
Plastering, tiling and floor refitting are separate trades from the plumbing repair. We encourage you to ask for them as their own lines, so you can see exactly what the leak costs and what the clean-up costs.
Reading Your Own Clues
Most hidden leaks leave a trail before they become a crisis. A boiler that needs topping up every few weeks, a bathroom floor that feels soft near the bath, or wallpaper lifting at a skirting board are all worth a call. Describing exactly where and when you noticed them lets us match a partner company that suits the job, and it narrows the search for the person who attends.
Heating Leaks Versus Mains Leaks
The two behave differently. A heating leak shows as falling boiler pressure and often leaves brown, rusty marks because the water carries inhibitor and sludge. A mains or cold-water leak keeps pressure up but pushes your meter round. Telling them apart on the phone speeds up the visit, and the partner company brings the right test equipment for the circuit involved.
After the Repair
A good leak job ends with a pressure test, a dry-out plan and a note of what was found. Plaster and boards can hold moisture for days, so leave vents open, run a dehumidifier if you can, and do not paint over a damp patch. If a stain reappears after drying, ring us: it may mean a second, smaller leak that was hiding behind the first.
Leaks in Conversion Flats and Cellars
Many Victorian houses in Woodside and South Norwood have been split into flats, with pipes threaded through shared floors and boxed in over the decades. A weep in one of those runs can appear two rooms and one tenancy away from the joint that causes it. The partner company traces it, notes it in writing and, where the source sits in a neighbour's or the freeholder's pipework, gives you the evidence to send them rather than a bill for a repair you do not own.
Cellars and understairs cupboards are the other classic hiding place. A damp smell with no visible drip often means a pipe sweating or weeping in a void, and a quick thermal check tells us whether it is a leak or simple condensation.
Frequently Asked Questions
How much does leak detection cost in Croydon?
Published ranges vary with the method. A Croydon price guide lists leak repairs from £105 to £400, with a typical £253, and a concealed leak needing thermal imaging and floorboards lifted at £265 to £575. UK-wide guides put most domestic leak surveys at £150 to £750. The partner company gives its own price in writing once it has assessed the problem.
How do you find a leak behind a wall?
The partner company starts with a moisture meter and visual checks, then uses thermal imaging to find temperature differences along the pipe. A pressure test of the suspect circuit shows whether it holds, and a targeted opening confirms the exact joint. It is slower than ripping out plaster, but it keeps the damage to the size of the fault and saves you the cost of repairs you did not need.
My water meter moves when everything is off. What does that mean?
It almost always means water is escaping somewhere after the meter, whether in the house, the garden or the supply pipe. Check for a running toilet or a dripping overflow first, because those are the easiest culprits. If nothing is obvious, ring us and the partner company can trace the supply pipe. Underground leaks cost more to locate, so we give you a likely range up front.
Is a leak from the flat above my problem to fix?
Not usually. A leak that starts in the flat above is a matter between the upstairs occupant, the freeholder or managing agent, and you are right to ask who is responsible before paying. The partner company can trace the source and write down what it found so you have evidence. It will not charge you to repair a pipe that belongs to someone else.
Can hard water cause leaks?
Indirectly, yes. Croydon East supply measured 308 mg/l as calcium carbonate in 2025, which is very hard, and scale builds up on joints, valve seats and stopcocks. A valve that cannot close properly turns a small drip into a larger one, and scaled compression joints can weep under heat. Replacing a failed valve rather than adjusting it usually solves it for good.
Do you open up floors and walls for every leak?
No. The aim is to find the fault precisely before cutting anything. Where an opening is needed, it is as small as possible and sited over the confirmed joint. The partner company tells you what has been opened and what making good is likely to cost, as a separate line on the written quote. That way you see the plumbing price and the clean-up price side by side, and can compare them with another quote if you wish.
What is a drip from an overflow pipe outside telling me?
An overflow pipe that drips outside, usually from a loft tank or a toilet cistern, means a float valve is failing and water is running to waste. It is worth fixing promptly, because a tank that overflows can soak a ceiling and your water bill will rise. A replacement valve is a small repair compared with the water damage it prevents. See our toilet repair options if it is a cistern.
Will you tell me if the leak is on the water main?
Yes. The pipe from the street to your boundary stopcock is normally the water supplier's responsibility, while the pipe from there to your house is yours. Croydon Council lists both Thames Water and Sutton and East Surrey Water for burst-main reports depending on the address, and the partner company will say which side of the line your fault sits on.
Can a leak damage the boiler or the heating system?
Yes. A heating leak lets pressure drop, so the boiler may lock out, and fresh water drawn in to top up carries more scale into the system. Water dripping on a boiler's electronics can also cause faults. Our boiler repair page covers lockouts, and the partner company repairs the leak first so the boiler is not asked to run on a failing circuit.
Can you cover leaks in Woodside and South Norwood?
Yes. We cover Croydon, Addiscombe, South Norwood, Shirley, East Croydon and Woodside, and send whichever partner company is nearest and suits the fault. Victorian terraces in both areas share many of the same ageing-pipe problems, including scaled joints and boxed-in runs under floors. Ring 07898 116196, give us your postcode and tell us where you first noticed the damp, and we will match the partner company.
Stain Spreading? Find the Leak Before It Finds the Floor
Written quote first. Call 07898 116196.
07898 116196