How Much Does Leak Detection Cost in the UK?

Why Leak Detection Costs Vary So Much

Ask three different plumbers for a leak detection quote without specifying the type of leak and you'll get three very different answers. That's because finding a dripping tap under a sink is nothing like locating a hairline crack in a pressurised pipe buried beneath a concrete floor. The cost reflects the method, the time, and the equipment required — not arbitrary pricing.

This guide breaks down what you can expect to pay for each type of leak detection — and when your insurance should be covering the cost, not you.

Types of Leak Detection and Typical Costs

Simple Visible Leak Investigation (£60–£120 call-out)

If a leak is suspected but not yet confirmed, a plumber's initial call-out involves a systematic check of accessible pipework, appliance connections, and fittings. If the leak is visible — a dripping joint under a sink, a weeping radiator valve, a loose washing machine connection — the investigation and repair are typically completed in one visit at a standard call-out rate. No specialist equipment needed.

Acoustic Leak Detection Survey (£200–£400)

For a hidden leak in underground pipework, beneath a concrete floor, or within a wall cavity, acoustic listening equipment is used to pinpoint the source by tracing sound. A survey of a standard domestic property typically takes 2–4 hours. The fee covers the engineer's time, equipment, and a written report with the confirmed leak location. This is the most common type of specialist leak detection survey.

Thermal Imaging Survey (£200–£350)

A thermal camera survey scans floors, walls, and ceilings for temperature anomalies caused by leaking water. Particularly effective for underfloor heating leaks and for mapping the spread of moisture after a leak event. Often combined with acoustic detection on the same visit for a more comprehensive survey, with a combined fee typically in the £300–£450 range.

Tracer Gas Detection (£350–£600)

The most precise method — used when acoustic detection has narrowed a leak to a general area but can't pinpoint it to excavation accuracy. A hydrogen/nitrogen gas mix is injected into the pipe and traced to the point of escape using a sensitive probe. Time-consuming and requiring specialist equipment, this carries the highest survey cost — but it almost always avoids the need for extensive exploratory excavation, which saves significantly more in the long run.

CCTV Drain Survey (£150–£350)

When the suspected leak is in underground drainage rather than a supply or heating pipe, a CCTV drain survey is the appropriate tool. A camera is fed through the drain to inspect the pipe interior. Costs depend on the number of access points and the length of drain run surveyed. A written report and video footage are included.

What Affects the Cost

• Leak type — mains supply pipe leaks, underfloor heating leaks, underground drainage, and boiler system leaks each require different methods and time
• Property size and access — larger properties with more pipe runs take longer to survey; concrete slab floors require more investigation time than suspended timber
• Location in the property — a leak clearly in one room is quicker to pinpoint than one with no obvious source affecting the whole house
• Report requirements — if you need a full written report for insurance purposes, allow for this in the quote

What Your Insurance Should Cover

This is the part most homeowners don't know about until they need it. Many home insurance policies include trace and access cover — a specific benefit that pays for the cost of finding a hidden leak and reinstating any surfaces disturbed to reach it (cutting into walls, lifting floorboards, breaking up screed). This is separate from the repair cost itself.

Trace and access limits vary by policy — typically £5,000 to £10,000 — but in most cases this is more than sufficient to cover the detection survey, any surface opening required to access the pipe, and reinstatement of the opened area. The repair itself (the new section of pipe, the joints, and the labour to fit them) is usually covered under the escape of water section of your policy.

Check your policy schedule before you book a leak detection survey. If trace and access cover applies, report the suspected leak to your insurer first — they may have preferred contractors, or may require pre-authorisation before specialist work begins.

When to Call Us

Our damp and leak detection team serves Peterborough, Stamford, Market Deeping, Yaxley, and surrounding areas. When you call, we'll discuss the symptoms, recommend the most appropriate detection method, and give you a fixed price for the survey before we start — no open-ended hourly rates. Book online or call 02039514510.

Frequently Asked Questions

Can a plumber find a hidden leak without specialist equipment?

In some cases — if the leak is audible, if damp patterns clearly point to a location, or if the pipe run is simple enough to pressure-test section by section. But for leaks in concrete floors, behind tiles, or in underground supply pipes, specialist acoustic or tracer gas equipment is required for reliable results. Without it, you risk the engineer opening up areas that don't contain the leak, increasing reinstatement costs significantly.

Does trace and access cover the cost of replastering or retiling?

Yes — trace and access specifically includes reinstatement of any surfaces opened to locate the leak. That typically covers cutting and patching plaster, lifting and relaying floorboards, and in some policies, retiling where tiles have been broken to access a pipe. The precise scope depends on your policy wording — review it or ask your insurer before work begins.

Is there a call-out charge on top of the survey fee?

At Peterborough Plumbers, no — our survey fees are fixed and all-inclusive. There are no separate call-out charges or parking fees added to the bill. The price quoted is the price you pay.

What happens if the survey can't find the leak?

A properly conducted survey with appropriate equipment very rarely fails to identify a leak that is causing measurable pressure loss or visible damp. If an initial method proves inconclusive, a second method (e.g. tracer gas following acoustic) is recommended at an agreed additional cost before any surface is opened. We won't recommend excavation without a confirmed location.