MML Plumbing Ltd

MML Plumbing Ltd 🔍 North London's Leak Detection Specialists | Hidden Water, Heating & UFH Leaks | Trace & Access Reports

24/08/2026

Why Is My Water Meter Constantly Spinning?

If your water meter keeps moving even when every tap is turned off, there's a good chance water is escaping somewhere on your cold water system.

That's exactly what happened during this investigation.

The customer noticed the water meter never stopped registering water usage despite nothing being used inside the property.

We carried out an acoustic leak detection survey beneath the timber floor instead of lifting large sections of flooring.

As we moved across the floorboards, the escaping water produced a clear acoustic signal that became stronger over one particular area.

Once the location had been confirmed, we lifted just five floorboards.

Underneath, we found a leaking 15mm cold water pipe supplying the bathroom.

The damaged pipe was repaired, the system pressure tested successfully, and the original floorboards reinstated.

One thing we regularly explain is that a constantly spinning water meter is one of the earliest warning signs of a concealed water leak.

The sooner it's investigated, the less damage the escaping water usually causes.

Accurate leak detection meant we only opened the area that actually needed repairing.

Have you ever checked whether your water meter is still moving when everything in your home is switched off?

https://www.mmlplumbing.co.uk/leak-detection/

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Tracing a hidden leak is not about guesswork; it is a methodical process of elimination that relies on physics rather th...
23/08/2026

Tracing a hidden leak is not about guesswork; it is a methodical process of elimination that relies on physics rather than intuition. Many property owners attempt to locate a leak by tracking the path of visible moisture, but water rarely travels in a straight line. It often migrates along joists, pipes, or electrical conduits, emerging nowhere near the actual point of failure.

At MML Plumbing, we utilise hydrogen tracer gas to navigate this complexity. By introducing a safe, non-toxic tracer gas into the isolated pipework, we can monitor for its escape with highly sensitive sensors. Because hydrogen molecules are exceptionally small, they will permeate through flooring, screed, and walls at the exact location of a rupture, even when the pipe is buried deep beneath a concrete slab.

This approach replaces the outdated and destructive method of trial-and-error excavation. By pinpointing the leak with precision, we ensure that repairs are targeted to a single spot, significantly reducing the disruption to your home or commercial property. Once the source is confirmed, we provide a comprehensive photo report suitable for insurance purposes, ensuring you have the evidence needed to support your claim.

If you suspect a leak but cannot find the source, stop the search before unnecessary damage occurs. Professional diagnostics provide the clarity required to resolve the issue efficiently. Have you recently noticed a drop in your system pressure or an unexplained rise in your water usage?

22/08/2026

Why Does Water Only Leak Through the Ceiling When the Shower Is Running?

If the ceiling only leaks while someone is using the shower, the shower is usually where the investigation should begin.

That's exactly what we found during this leak detection investigation in Barnet.

The homeowner explained that the ceiling below stayed completely dry all day, but as soon as the upstairs shower was used, water started appearing through the ceiling.

Rather than opening the ceiling immediately, we carried out controlled shower testing while monitoring the affected area with a thermal camera.

As the shower continued running, the thermal images showed fresh moisture spreading through the ceiling structure, confirming that the leak only occurred during shower use.

To pinpoint the exact source, we inserted an endoscope camera into the concealed ceiling void.

The inspection camera showed water escaping around the shower installation and travelling through the floor joints before finally dripping through the ceiling below.

One thing we regularly explain is that the timing of a leak is often one of the biggest clues. If the leak only appears while the shower is running, it's rarely a random plumbing fault somewhere else in the property.

Finding the source before opening the ceiling meant the repair could be targeted exactly where it was needed.

Would you have investigated the shower first—or started opening the ceiling?

https://www.mmlplumbing.co.uk/leak-detection/

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20/08/2026

How Can a Thermal Camera Show Water Spreading Inside a Ceiling Before It's Visible?

A thermal camera doesn't actually detect water.

It detects temperature differences that occur as moisture changes the way building materials heat up and cool down.

During one of our leak detection investigations, we attended a property where the homeowner suspected a hidden ceiling leak, but very little damage could be seen.

Instead of opening the ceiling, we carried out controlled testing while monitoring the area with a thermal camera.

As water entered the ceiling void, the thermal image showed the moisture spreading through the structure before significant staining became visible.

By following that thermal pattern, we traced the leak back to its source without unnecessary damage.

One thing we regularly explain is that thermal imaging is a diagnostic tool, not a magic camera. It works best when combined with practical leak detection experience, controlled testing and an understanding of how water moves through a building.

In many cases, it allows us to identify the correct area to investigate before the ceiling shows obvious signs of failure.

Would you have expected a thermal camera to reveal a hidden leak before you could even see the damage?

https://www.mmlplumbing.co.uk/leak-detection/

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Thermal imaging technology has fundamentally changed how we approach property maintenance. By visualising temperature di...
19/08/2026

Thermal imaging technology has fundamentally changed how we approach property maintenance. By visualising temperature differentials behind finished surfaces, we can identify the precise path of a concealed water leak without the need for destructive exploratory work.

Many homeowners believe that a damp wall or a musty smell indicates the leak is located exactly where the symptoms appear. However, water often travels along structural elements, joists, or pipe runs, meaning the point of origin is frequently several meters away from the visible damage. Relying on guesswork often leads to unnecessary floor lifting or wall removal, resulting in significant repair costs and prolonged disruption.

Our non-invasive diagnostic process uses thermal imaging alongside acoustic testing and tracer gas to map the exact route of the water. This evidence-based approach ensures that when we identify the source, the repair is targeted and effective. By verifying the failure point before any materials are disturbed, we provide landlords and property managers with the clarity needed for insurance claims and efficient remedial planning.

If you suspect a leak in your property, prioritising accurate diagnostics prevents the cycle of recurring damage and unnecessary repairs. Have you had to deal with unexplained damp or rising water bills recently? Let us help you locate the source with precision. 💧

18/08/2026

How Can a Small Radiator Leak Cause Constant Boiler Pressure Loss?

This investigation in Richmond shows that even a tiny radiator leak can cause continuous pressure loss across an entire heating system.

We attended a three-storey commercial property near Richmond Park after the boiler constantly lost pressure.

The heating system supplied 27 radiators, and previous inspections had failed to identify the source of the water loss.

Rather than assuming there was a hidden pipe leak beneath the floor, we carried out hydrogen tracer gas leak detection across the complete heating system.

As we tested each radiator, one concealed radiator produced a strong hydrogen reading.

The leak couldn't be seen because the radiator was enclosed behind a decorative timber cover.

Once the cover was removed, we found the problem.

A small leak from the radiator air bleed valve.

Although the leak appeared minor, it was allowing enough water to escape over time for the boiler pressure to continually fall.

The faulty air vent was repaired, the heating system was pressure tested, and the boiler held pressure correctly once again.

One thing we regularly explain during heating leak investigations is that constant pressure loss doesn't automatically mean the leak is hidden beneath the floor.

Sometimes it's hiding behind a radiator cover.

Would you have checked all 27 radiators before lifting the floor?

https://www.mmlplumbing.co.uk/leak-detection/

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16/08/2026

How Accurate Is Hydrogen Leak Detection?

This investigation in North West London gives the answer.

Thames Water advised that there was continuous water loss and a concealed leak somewhere on the incoming cold water supply.

Instead of lifting floors to search for it, we carried out hydrogen tracer gas leak detection.

After isolating the cold water system, hydrogen tracer gas was introduced into the pipework. Because hydrogen molecules are extremely small, they escape through tiny defects before rising naturally through the floor, allowing us to trace the leak without unnecessary damage.

As we surveyed the property, one area beneath the timber floor produced a strong hydrogen reading.

Only after confirming the location did we lift the floorboards.

Directly underneath, we found the concealed cold water pipe spraying water exactly where the hydrogen survey had identified.

The damaged pipe was repaired, the system pressure tested successfully, and the floor reinstated.

One thing we regularly explain to homeowners is that hydrogen tracer gas doesn't simply tell us there's a leak.

It helps us prove exactly where the leak is before opening the building.

That's why it has become one of the most accurate non-invasive leak detection techniques available for concealed water supply leaks.

Would you trust guesswork—or scientific testing before someone starts lifting your floors?

https://www.mmlplumbing.co.uk/leak-detection/

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Water meters are often the most overlooked diagnostic tool in a property owner's toolkit. Many homeowners and landlords ...
15/08/2026

Water meters are often the most overlooked diagnostic tool in a property owner's toolkit. Many homeowners and landlords assume that a high water bill is simply a result of increased usage, but this is frequently the first objective indicator of a hidden leak within the plumbing system.

If you suspect a leak, perform a simple static test. Ensure all taps, appliances, and external outlets are completely closed. Check your water meter reading, wait for two hours without using any water, and check the meter again. If the reading has advanced even slightly, you have confirmed a continuous flow of water that should not be there.

While this test confirms the presence of a leak, it does not reveal the location. This is where professional diagnostics become essential. At MML Plumbing, we take this evidence-based approach further. By utilizing acoustic testing and hydrogen tracer gas, we isolate the exact point of failure without the need for destructive exploratory work.

Locating the leak early is the difference between a minor repair and a major structural renovation. We provide a comprehensive, insurance-approved photo report for every investigation, ensuring you have the documented evidence required for your claims or maintenance records.

Have you noticed your water meter running while your property is unoccupied? Early detection is the best way to prevent long-term damage.

14/08/2026

Can Rodents Cause Hidden Hot Water Pipe Leaks Beneath Concrete Floors?

Yes—and that's exactly what we discovered during this leak detection investigation in Barnet.

The customer contacted us because part of the concrete floor remained damp, but there were no visible leaks anywhere inside the property.

Rather than breaking the floor immediately, we started with thermal imaging.

The thermal camera clearly showed heat spreading beneath the concrete slab, confirming that hot water was escaping from a concealed pipe below the floor.

Once the investigation confirmed the location, we opened only the affected area.

Beneath the concrete, we discovered the real cause.

Rodents had chewed through the plastic hot water pipe.

Every time hot water passed through the system, it escaped into the concrete floor, allowing moisture to spread through the slab long before the homeowner noticed the problem.

The damaged section of pipework was replaced, the system was pressure tested successfully, and the floor was reinstated.

One thing we regularly explain is that hidden leaks aren't always caused by age or poor workmanship. We've investigated properties where rodent damage has created significant concealed leaks beneath concrete floors.

Finding the leak before excavating keeps disruption to a minimum and ensures the repair is carried out exactly where it's needed.

Would you have expected rodents to be responsible for a hidden hot water leak?

https://www.mmlplumbing.co.uk/leak-detection/

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12/08/2026

Could a Leaking Window Be Mistaken for a Failed Terrace Waterproofing System?

Absolutely—and this investigation in Richmond shows why proper leak detection can prevent expensive mistakes.

The homeowner experienced water leaking into the bedroom every time heavy rain arrived.

The initial opinion was that the terrace waterproofing system had failed.

Before recommending major repair work, we carried out a non-invasive leak detection investigation.

Using thermal imaging, we traced how moisture was spreading through the ceiling and surrounding structure during the investigation.

The results told a very different story.

The terrace wasn't leaking.

Instead, the thermal investigation led us to the external window, where the silicone seal had failed.

During heavy rainfall, water entered around the window frame, travelled through concealed structural voids and eventually appeared through the bedroom ceiling.

One thing we regularly explain during rainwater investigations is that water can travel a considerable distance before becoming visible, making the actual entry point very difficult to identify without systematic testing.

In this case, replacing the terrace waterproofing would never have solved the problem.

Repairing the failed window seal would.

That's why accurate diagnosis should always come before expensive building work.

Would you have replaced the terrace before investigating the window?

https://www.mmlplumbing.co.uk/leak-detection/

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103 Ribblesdale Avenue
London
N113AW

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Monday 8am - 5pm
Tuesday 8am - 5pm
Wednesday 8am - 5pm
Thursday 8am - 5pm
Friday 8am - 5pm

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