Hidden Water Leak Detection London — Causes, Signs & Fixes

Corroded or pinhole pipe leaks

Over time, older copper pipework develops pinholes from corrosion, particularly where water chemistry or pipe movement has weakened the metal. These leaks are too small to hear or see until significant damage has occurred.

Failed pipe joints or push-fit fittings

Compression fittings can work loose in concealed locations. Push-fit fittings can unseat over years of thermal expansion.

UFH pipe micro-leaks

Underfloor heating pipe can develop micro-leaks at joints or from damage during subsequent floor work. Detectable by pressure testing the manifold circuits.

Rising mains or supply pipe

The supply pipe entering the property can crack underground, causing water to saturate the ground and find its way into the structure.

Shower tray or bath seal failure

Water escaping past a failed shower tray seal or bath caulk slowly saturates the sub-floor and adjacent walls before becoming visible.

How do you find a leak without breaking walls?

We use acoustic leak detection (listening for the sound of escaping water through pressurised pipes), thermal imaging (spotting temperature anomalies), and tracer gas — all non-invasive methods that locate leaks within centimetres.

How much does hidden leak detection cost in London?

Detection surveys start from £150+VAT. Most leaks are found and repaired on the same visit. We provide fixed pricing before any work begins.

My water bill has doubled but I cannot see any leak — what should I do?

Turn off all water outlets and check whether your water meter is still turning (if you have one). If it is, you almost certainly have a hidden leak. Call us for a survey.

Can you detect leaks in underfloor heating?

Yes. We pressure-test individual UFH manifold circuits to identify which loop is losing pressure, then use thermal imaging to locate the exact fault point in the floor.