NI Leak Detection uses advanced tools like thermal imaging and tracer gas to locate leaks under floors and behind walls in Derry / Londonderry.
Our Trace & Access reports make it easier to recover costs from your insurer.

If you suspect you have a leak, you need a local specialist. You do not need a company that charges for the drive from Belfast. We are based in the North West. We serve the Cityside and the Waterside every day. Our engineers live and work here. We find and fix your water leak using non-destructive leak detection.
A hidden water leak causes damage quickly. You might see damp patches on a wall. You might notice your boiler losing pressure. These signs indicate a water leak that needs immediate attention. We use specialist equipment to find the source of your leak without digging up your floors.
Call our local team on 028 9507 1126 to book your leak detection.
We serve all areas within Derry / Londonderry, e.g. Cityside; Waterside; Bogside; Creggan and the surrounding towns. Our engineers are frequently in Limavady, Claudy, and Eglinton. We travel to Strabane and Newbuildings regularly.
Many of our clients live near the border. We provide a full service to the Donegal border areas. If you have a leak in Muff, Bridgend, or Burnfoot, we can help. We cross the border to ensure local homeowners receive an expert leak detection service.
Mains, domestic & commercial properties
Including concrete and tiled floors
Leak detection for heating systems
Complete repair service
Trace & Access reports for insurers
Expert advice for Derry properties
We do not use guesswork. We use advanced detection technology to find the exact location of the pipe leak. Our methods protect your property from unnecessary damage.
We use sensitive microphones to hear the sound of water escaping under concrete.
We move safe gas through your plumbing. We detect where it escapes to pinpoint the leak.
Our cameras see heat signatures. This helps us find a leak in your central heating system or underfloor piping.
We track moisture levels through walls and floors to find where the water started.
Our leak detection engineer will find and fix your water leak on the same day in most cases. We handle mains water leaks and bathroom leaks with equal precision.
In the Waterside area of Derry, a homeowner noticed their heating system losing pressure. Our engineers used acoustic leak detection and tracer gas testing to identify a leaking pipe beneath the kitchen tiles. Only one tile was lifted, the leak was repaired the same day, and the client recovered £2,180 under their Trace & Access cover.
"NI Leak Detection repaired a central heating leak in our Derry home with minimal disruption. They dealt with our insurance company, and everything was approved without delay."
– Anne, Cityside, Derry
"We run a business premises in Derry city centre and had a water leak beneath concrete flooring. The engineers used infrared thermography and tracer gas to locate it fast. The insurance report was accepted first time."
– Mark, Derry
"In our terraced house near the Bogside, damp patches appeared. The team used a borescope camera and moisture meters to confirm a hidden leak without damage. Their Trace & Access report meant the costs were fully covered."
– John, Derry
Most home insurance policies include Trace and Access cover. This part of your policy pays for the cost of finding the leak and exposing the pipe. We provide a comprehensive leak detection report for your insurance company.
The report includes photos of the damage and the leak location. It details the detection methods used. This document is essential for your insurance claim. We help you recover the costs of the professional service. We make dealing with a leak easier by providing the evidence your insurer requires.
Photo evidence and testing records
Professionally prepared Trace & Access documents
Maximise your insurance claim potential
Choosing a local firm means faster response times. If you have a water pipe leak, time is critical. Water damage leads to mould and structural issues.
Our team consists of experienced leak detection specialists. We are qualified plumbers. We do not just find the problem. We provide a full repair service.
We have found and fixed the leak for hundreds of residents in the Bogside, Creggan, and across the Waterside.
Common questions about our leak detection service in Derry / Londonderry
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We cover all of Derry, Foyle and the North West, including:
We also provide Leak Detection Services across Northern Ireland.
Do not let a suspected leak ruin your home. Hidden water leaks do not stop on their own. They grow larger and more expensive to fix.
Call 028 9507 1126 now. Speak directly to an engineer who knows the Derry / Londonderry area. We will provide a clear price and an arrival time. We are the leading leak detection specialists in the North West.