Water Leak Repair Cardiff
Found A Leak? We'll Get To You Fast
Burst pipe, dripping joint or a damp patch on the ceiling? If water’s getting where it shouldn’t, our local team will find it and fix it.
Book an Engineer →Your Local Plumber in Cardiff
We’ve been finding and fixing water leaks across Cardiff for over fifteen years, for homeowners, landlords and businesses alike.
Gas Safe Registered (518700)
NJ Harkus is Gas Safe registered (518700), City & Guilds qualified and CIPHE members, with full public liability insurance for all plumbing, heating and gas work.
Highly Recommended & Reviewed
From dripping joints to leaks no one else could find, customers rely on our experienced team to put things right.
Complete Water Leak Services
From Burst Pipes To Hidden Leaks
We deal with every kind of water leak across Cardiff, from a sudden burst pipe flooding the kitchen to a slow drip that’s been quietly staining the ceiling for months. Whether the source is obvious or hidden under floorboards or tiling, our team will track it down, fix it properly, and make sure it doesn’t return.
Our water leak services include:
- Burst pipe repair and replacement
- Leak detection and diagnosis
- Ceiling and wall leak tracing
- Under-floor and concealed pipe leaks
- Leaks from radiators, valves and joints
- Boiler and heating system leaks (we repair all boilers)
- Leaks from taps, basins, sinks and showers
- Leaks from toilets and cisterns
- Leaks in lofts, airing cupboards and outbuildings
- Stopcock and isolation valve replacement
Got A Leak That Needs Fixing?
Water Leak Repair Across Cardiff & The Surrounding Areas
We carry out water leak repairs across Cardiff and the surrounding areas, including Penarth, Sully, Barry, Cowbridge, Pontyclun, Llantrisant, and Dinas Powys. From Victorian terraces with original lead pipework to newer estates with concealed plastic runs, our team handles leaks across every type of property.
Business Hours
24 Hours, 7 Days A Week
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We Are Highly Recommended in Cardiff & The Surrounding Areas
Professional Leak Detection
We Know Where To Look
Water travels along pipework, runs down beams, and can come through a ceiling several metres from the actual source. Therefore, cutting into the first damp patch you see can sometimes make things worse, not better.
At NJ Harkus, we will always diagnose properly before any work begins. That means checking pressure, isolating sections, examining all the likely sources, and only opening up flooring or ceilings where it genuinely needs to happen. Most leaks we find are without making a mess of the property.
Got a leak that needs finding? Get in touch, and we’ll come and have a look.
Water Leak Repairs
The Repair That Actually Holds
Once we’ve found the leak, the repair depends on what caused it. A failed compression joint is a quick fix. A pinhole in old copper might mean replacing a section of pipework. A leaking radiator valve or a leaking soldered joint needs a different fix altogether.
We carry out the repair properly, using the right materials and techniques for the type of pipework involved. Once it’s done, we’ll pressure-test, check for any other weak spots in the same run, and walk you through what we did so you know exactly what’s been fixed.
Got a leak that needs sorting? Contact our team, and we’ll come and put it right. Is it flooding your house right now? Our emergency team in Cardiff are on their way!
Frequently Asked Questions
Our Water Leak Service FAQs
I can see a damp patch on my ceiling. Is it definitely a water leak?
Not always, but probably. Damp patches can come from condensation, a roof leak, or a problem with external rendering. When the patch grows, changes shape with the use of upstairs water, or appears in dry weather, plumbing is usually the cause. We can check the most likely sources first and rule things in or out before any access work begins.
How do you find a leak without ripping up the floor?
We start with the obvious sources: visible pipework, joints under sinks and basins, radiator valves, and any fixtures the leak could be linked to. From there, we isolate sections of pipework, check water pressure, and follow the trail back to the source. Most leaks we find are without lifting any flooring. Where we do need to open up an area, we’ll always explain why before we start.
My water bill has suddenly gone up. Could it be a leak?
Possibly. A hidden leak somewhere in the system, particularly in the supply pipe between the meter and the house, will quietly waste water for months without showing any obvious signs. If the water meter is still ticking over when nothing in the house is running, you’ve almost certainly got a leak somewhere.
My boiler keeps losing pressure. Is that a leak?
It often is. A small leak somewhere in the heating system, including radiators, valves, the boiler itself, or the pipework connecting them, will cause the pressure gauge to slowly drop over days or weeks. We can find the source and repair it properly.
