Methods We Use

Leak detection methods


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London, United Kingdom

Leak testing methods from a real specialist in Barnet

When you finally decide you need professional help, we are the team for you in North London, Barnet.
We’re not just simply using our knowledge to find a leak, but using non-invasive tools to see through the walls, and floors, so we don’t need to cause more harm than you already have.
Those tools are either seeing through the surface, checking the temperature or listening.
Finding or detecting leaks has never been easier for us, that’s why NL Group invested a lot of money into the latest technologies.

What are the 4 types of methods?

 Data may vary according to methods of collection such as observation experiment simulation and analysis.

If you wish to receive a professional service contact NL Group today.

Our 3 main non-destructive methods

Thermal imaging

Telescopic Cameras

Water Leaks


Hidden Internal Water leak testing

We found and fixed 99% of the leaks we were called to investigate.
Whether it is a small leak, a few drops or just a slow leak do not underestimate them.

There can be some easier leaks such as water heater leaks, toilet tank leaks, small leaks that are visible, stop tap leaks or another appliance leaking. They normally don’t require leak detection.

However when water damage is visible on the wall, low pressure or loss of pressure in your boiler, high water bills occur, which means the leak happens inside, and you need to call in a professional.


Tell me the best way to detect water leaks at home.

Whether you are renting or owning a property it’s possible to experience a leak from multiple places. One can be a leaky appliance such as a washing machine, boiler or dishwasher, but it can be more serious as a heating system leak, bathroom shower leak, radiator leak an internal leak.

Some people are happy to guess where the leak is coming from and try to fix it, but this is something we don’t recommend.

There are some useful things a homeowner/tenant can do, and that’s monitoring.
Checking the bills if they are suspiciously higher than they should be, checking for damps, moulds, water patches or water pools outside.

If you suspect a leaky toilet, you can do a food colouring method, but for internal leaks, you need a professional with professional tools.

Even the smallest leak can cause around 200 to 400 litres of water a day (2.5 – 5 bathtubs a day). So imagine the internal, unmonitored leaks.


Water meter

A water meter is the best indicator of when to call a leak detection specialist.

If you suspect a leak but are not sure, the best thing to do is close the stopcock, empty all the taps and check the water meter. If it is still going, you have a leak.

How to detect a water leak outside or in the garden?

It can be hard to see whether the water in the house has been leaking, checking a water meter to see whether it has been hidden or inside. Start by shutting off the stop valve and ensuring no water is leaking out of the house; turn on the water tap and wait until no water enters your house. If the dial is still rotating, if so, then the leak will be on the water hose outside the property. Usually, leaks on internal pipes and appliances are plugged in when the water leaks. Once you determine if the water has leaked inside the home begin to search.


Leak detection service provided by MML Plumbing Ltd, trading as NL Leak detection. We cover only the North London area, which means we can attend quicker than other leak detection companies covering the whole of London or the UK. We specialize in hidden water leaks, leak location, locating leaks, heating systems, leaking baths, and detecting leaks.