Mains Water Leak Detection
Stop hidden mains leaks before they cause costly damage. Specialist engineers locate the source precisely using non-invasive methods. Clear findings can support an insurance claim.
What is a Mains Water Leak?
Mains water refers to the supply pipe bringing water into your property from the external stop tap. The first sign of a problem is often an unusually high water bill or meter reading, even when no visible leak is present. In many cases, the water company may be called out initially to check for network issues, but pressure testing can confirm a drop in the system, showing the leak is within the customer’s section of the mains supply.
When left unresolved, a small supply leak can quickly develop into a larger issue below ground, increasing damage and water loss.
How a Small Underground Leak Becomes a Big Problem
Unlike plumbing and central heating leaks, mains water leaks usually occur outside the property boundary – beneath driveways, gardens, or sub-floors – and often go unnoticed until bills rise or the ground becomes damp. These leaks can quietly erode foundations and spread beneath the property without any visible signs.
Common signs include:
A sudden, unexplained rise in your water bill or meter reading
Damp patches appearing on floors or walls
Musty smells or mould growth
Reduced water pressure
Water escaping into neighbouring properties
Left untreated, mains leaks can cause structural instability, costly repairs, and even disputes with neighbours. Early detection is essential to protect your property, reduce waste, and support a smooth insurance claim process.
How We Detect Mains Water Leaks
Finding a hidden mains or supply-pipe leak requires precision and experience. Specialist leak detection contractors use proven, non-invasive techniques to locate leaks quickly - without unnecessary excavation or disruption to your property.
Acoustic Leak Detection
Using sensitive ground microphones and listening devices, specialist engineers can detect the sound of escaping water beneath concrete, tarmac, or soil - pinpointing even small underground leaks with accuracy.
Tracer Gas Technology
A safe, non-toxic gas is introduced into the pipe system. It escapes precisely at the leak point, allowing the contractors to locate the source even beneath solid floors with minimal disruption.
Thermal Imaging Cameras
Thermal cameras reveal hidden temperature changes caused by water movement under floors or driveways. This helps us trace the route of your mains supply line and narrow down leak areas fast.
Insurance-Ready Reporting
All findings are clearly documented with photos, readings, and a detailed report your insurer can use to approve repairs. Our FCA-regulated claims team can then handle your claim from start to finish.
From detection to repair and recovery, our FCA-regulated claims team and professionally accredited drying technicians ensure your property is fully restored with minimal disruption.
Trace & Access
Engineers first locate the leak using non-invasive tools such as thermal imaging, acoustic listening, correlators, tracer gas and endoscopes, then record the result. Once marked, only that exact spot is opened, typically a small targeted dig for mains leaks, keeping the rest of the property intact.
Benefits
Minimal disruption and faster turnaround
Lower reinstatement costs compared with exploratory digging
Clear evidence for contractors and insurers
Process
Survey the area and run non-invasive tests
Confirm results and mark the location
Open the marked point and document findings
Our insurance claim support service is provided completely free of charge, provided we’re authorised to arrange approved repairs once your claim is settled.
Repairs and Insurance Support
Once the leak has been identified, our FCA-regulated firm - Allpropertyclaims Ltd (APC) - can manage the insurance process on your behalf. Their claims specialists work with loss adjusters and insurers to agree approved restoration works and minimise disruption. This support is provided at no cost to you, provided APC is authorised to arrange the approved repairs once your claim is settled.
With our support, you benefit from:
A dry, restored, and healthy environment once approved works are complete
Reduced disruption to your home or business
Cost savings by preventing further deterioration
FCA-approved claims management to protect your interests
Peace of mind knowing all works are certified
Benefits of Choosing Us
Choosing the right leak detection service can save you thousands in repair costs and weeks of stress. Here’s why homeowners and businesses trust us:
Save Money
Avoid costly property damage and easily claim back eligible leak detection costs through your insurer where cover applies for complete peace of mind
Stress Less
We coordinate everything - from helping you arrange leak detection to guiding your insurance claim and organising approved restoration works.
One Point of Contact
No chasing multiple companies. We coordinate the process - from finding the leak to dealing with your insurer and arranging approved restoration works
FCA Regulated
Through our FCA-regulated firm, your claim is handled with fairness and transparency, giving you complete peace of mind throughout the process
Frequently Asked Questions
We know insurance claims can feel overwhelming, especially if it’s your first time dealing with one. That’s why we’ve put together this FAQ section - to answer common questions, explain the process in plain English, and show how our expertise makes the journey smoother and less stressful for you.
How to detect a leak in the main water line?
Check your water meter when no water is being used. If it’s still moving, there’s likely a leak. To identify whether this leak is inside your property , turn off your internal stopcock. If the meter stops moving, the leak is inside. If it keeps moving, the leak is outside on the supply line.
Who is responsible for a mains water leak?
If the leak is before your internal stopcock, then its usually the water company who is responsible to fix the leak. If the leak is found after the stopcock (on your property), then it is your responsibility to fix the leak.
Does house insurance cover mains water leaks?
Yes. Your buildings insurance will generally have Escape of Water listed as an Insured Peril. This means they will cover for the damage caused in your property by a mains water leak. With Trace and Access cover they will also cover the cost of leak detection and the intrusive access to get to the leaking pipe. The only cost the insurance will not cover is for repairing the leaking pipe.
Customer Reviews
Leak Tracers Direct has more positive reviews than any other leak tracing company. Take a look at our customer reviews page, or click on the logos below to see our reviews.
S. Charania - 27 Sep 2025 ★★★★★
Super Service
I am an overseas landlord. My tenant’s ceiling collapsed from a bath-mixer leak. APC ran the claim, arranged drying and full restoration, and managed it all while keeping me informed remotely. Couldn’t have done it without them.
Aziza - 13 Sep 2025 ★★★★★
Leak Found
Great company to know in a time of difficulty. When no one else could find the leak, they manage to find it in less than three hours.
Kavajer - 12 Sep 2025 ★★★★★
Excellent
The sudden appearance of ceiling stains was stressful. Leak traces identified the leak and produced a detailed report so the leak could be exposed and repaired. Then their claims team at allpropertyclaims worked with my insurer to approve and cover drying and reinstatement. The whole thing cost me nothing, and my home was back to normal quickly.
Robert Luke - 27 Aug 2025 ★★★★★
Extremely happy with leak tracers! And only wish I had found them sooner. They helped me find an impossible leak. I had first contacted 2 plumbers who tried to find the leak but were not able to. Having wasted money on these plumbers I was advised by my insurer to get a specialist leak detection company.
Amit Joshi - 27 June 2025 ★★★★★
Truth is, words cannot say just how brilliant a service that Tan and the super APC team provided from initial assessment to sterling completion. Indeed, Tan and the team assured supreme service, professionalism, guidance and support at every stage of my claim and that is exactly what they delivered
Ian Belnikoff - 31 March 2025 ★★★★★
Following the failure of three different plumbers to locate a leak in my bathroom, I made contact with Moez who arranged for an expert to visit my property with specialist detection equipment. The source of the leak was quickly found and a temporary repair effected which required the bathroom floor to be partially
Our Team
Our people are at the heart of everything we do. Once a trusted specialist engineer has located your leak, dealing with the aftermath of water damage in your property can be your biggest challenge. From the very start, you’ll be supported by a dedicated surveyor who coordinates damage assessment, meets with the insurer’s loss adjuster, and oversees approved repairs through our trusted contractor network.
You’ll also have a dedicated claims manager who liaises with your insurer to present your claim, agree approved works, and ensure a fair outcome and a smooth, stress-free process from start to finish.
Georgie Hardy
Call Centre Manager
Tanbir Sidhu
Head of Business Development
Steve Guest
Surveyor
Case Studies
Our case studies show how we’ve helped property owners detect and resolve hidden leaks. From damp walls to unexplained water damage, we use advanced, non-destructive methods to locate the source quickly and restore peace of mind. Explore the examples below to see how our expertise delivers fast, stress-free results.
Twickenham
Mains Water Leak
Incident
The homeowner noticed unusually high water bills and initially assumed there was a billing error. He called Thames water and they sent out an engineer who concluded that the high water bills were due to a faulty water meter and changed the meter. The bills next month were once again unusually hight. This time Thames Water sent out another engineer who concluded that the leak was from an incoming pipe from the road which they had repaired few weeks ago. They said their file was closed and they were unable to help further. Sadly the high water bills continued and now the home owner also started to see water damage appearing on his entrance hallway walls. Thames water then suggested the leak may be coming from inside his property and suggested that he should get a leak detection expert to help.
Client Concerns
The client was concerned over the unaffordable high water bills that his walls were showing signs of moisture. Finding the leak was like looking for a needle in a hay stack - short of ripping out walls and floors he had no way of tracing or stopping this leak. He tried to call his insurer but they were unwilling to help him because they said that unless he could prove the cause of the water damage they could not consider a claim under insurance. He had a new born baby in his home and was concerned over the disruption this may cause and also the impact of mould on his young family’s health.
Finding the Leak and dealing with the Insurance Claim
The client called us when all other efforts had failed. He was first put in contact with a leak detection specialist who using pressure testing was quickly able to locate the leak form an incoming water mains pipe just near the water meter outside the front door. It was in the connection of the pipe leading into the house and there was standing water in water meter chamber in the pavement just outside the front door. High levels of moisture were traced under the hallway wood flooring, which when lifted revealed significant mould and moisture damage. As there was a young child in the property, where the risk of mould exposure was dangerous, we first got the insurer to agree to move the family into alternative accommodation for a brief period. The affected area was then dried and certified and also treated for mould. Then new flooring was installed and the walls were painted and decorated
Outside Front Door
Leak located outside front door
Pressure test confirming system drop
Leak located in external chamber
Claim Back Eligible Leak Detection Costs
Did you know that if your insurance policy includes Trace & Access cover, you may be able to reclaim the cost of leak detection? Through our FCA-regulated firm, we can arrange for these costs to be recovered directly from your insurer – provided there’s an insured peril in place.
And it doesn’t stop there. When structural drying is required, the equipment used can consume a lot of electricity. Professionally accredited drying technicians record this usage so these costs can be reclaimed under your insurance policy where cover applies.
Through our FCA-regulated firm – your claim is managed properly and fairly
No extra cost to you - reclaimed under your policy where cover applies
Hassle-free process - from finding the leak to managing repairs
Don't pay more than you should.
Call us now on 020 3011 0902 or request a callback today.