Plumbing & Heating and Water Mains Specialist · Based in Brentwood, Essex
Grant Corney is a leak detection engineer specialising in identifying hidden water leaks using thermal imaging, tracer gas, and acoustic listening equipment.
CIPHE accredited
WIAPS member
Grant is part of ADI Leak Detection — the UK's leading leak detection specialist with 1,250+ five-star Trustpilot reviews, full CIPHE and WIAPS accreditation, and £5 million public liability insurance.
Grant holds an NVQ Level 2 in Plumbing & Heating and is a Thames Water Approved Plumber. He has 20 years in plumbing and heating, 7 years in water mains replacement, and 6 years as a leak detection specialist with ADI. He is particularly well regarded for his work on plumbing and heating systems and water mains investigations.
Recent leak investigations carried out by Grant Corney across central heating, water mains, underfloor heating and bathroom leak detection.
At a property in PE33, the external water meter was observed continuously rotating despite no water being used inside or outside the building. Underground mains leak found at failed reduction fitting, repaired.
A property in ME3 was showing significant water damage across the kitchen utilities and bathroom walls, with water visibly coming up through the lino flooring in the bathroom. Pinhole leak found behind disability-adapted sink, pipe replaced.
Real Trustpilot feedback from customers Grant has attended.
Grant spent 20 years diagnosing and repairing faults across domestic and commercial plumbing and heating systems before joining ADI as a leak detection specialist. That background means he understands how systems are built and where they tend to fail — useful when a leak is hidden and the source is not obvious. He covers a broad patch across London and the South East, and is known for being straightforward with customers about what he has found and what needs to happen next. Away from work, Grant is a West Ham supporter and a regular at the gym.
Grant specialises in central heating leak detection, underfloor heating leak detection, water mains leak detection, bathroom leak detection, drain leak investigation, and underground leak detection. He is particularly known for his work on plumbing and heating systems and water mains. These specialisms reflect over two decades of hands-on work across both domestic and commercial properties.
Grant uses thermal imaging cameras to detect heat anomalies that indicate water escaping behind walls or under floors, avoiding unnecessary damage to the structure. Tracer gas is injected into pipework and a surface detector pinpoints where gas escapes, identifying the exact leak location on buried or concealed pipes. Acoustic listening equipment amplifies the sound of escaping water, and borescope cameras allow visual inspection inside drains and confined voids.
Grant has 20 years in plumbing and heating, 6 years in leak detection, and 7 years in water mains replacement. He holds an NVQ Level 2 in Plumbing & Heating and is a Thames Water Approved Plumber. That combination of trade experience and formal qualification underpins his ability to investigate a wide range of leak types accurately.
Grant works on both domestic and commercial properties, covering everything from leaks within residential central heating and underfloor heating systems to faults on commercial water mains. He handles straightforward internal leaks as well as more complex investigations involving buried supply pipes or underground drainage. His background in water mains replacement means he is well equipped for jobs that go beyond detection and into remedial work.
If you notice unexplained damp patches, a rising water bill, loss of pressure in a heating system, or warm spots on a floor above underfloor heating pipework, a leak investigation is warranted. These symptoms often indicate a hidden leak that will worsen without intervention. Call ADI Leak Detection on 0800 731 3843 to book an investigation — ADI will aim to assign Grant where he is available in your area.
Grant follows a consistent five-stage process on every visit. The approach is non-invasive and designed to isolate the fault before any disruption to your property.
Grant works on central heating and underfloor heating systems, water mains, bathroom plumbing, drains, and underground pipework.
His investigations cover everything from pinpointing a slow leak within a pressurised heating circuit to tracing a fault along a buried mains supply pipe.
Drain leak investigation is also within his scope, including locating failures in underground drainage runs.
Grant covers a wide area across London and the South East, including Bedfordshire, Hertfordshire, Essex, Kent, Surrey, Berkshire, Buckinghamshire, Cambridgeshire, Oxfordshire, Hampshire, Norfolk, Suffolk, Northamptonshire, East Sussex, and West Sussex.
Grant works on both residential and commercial properties, handling jobs ranging from straightforward internal leaks to full water mains replacement on buried supply pipes.
His 20 years in plumbing and heating means he is equally at home investigating a leak beneath a domestic kitchen floor or tracing a fault in a commercial heating system.
He is particularly experienced with water mains work, having spent 7 years in water mains replacement before specialising in leak detection.
Grant carries out leak detection surveys across Greater London, South East, East Anglia & The Midlands. His work includes domestic and commercial investigations involving central heating, water mains, underfloor heating, bathroom, and drain leaks.
ADI Leak Detection aims to provide next-day availability across the UK — call today for a quote.
