Commercial Leak Detection London

Acoustic correlation is the primary method for pressurised pipes in concrete. It analyses sound frequencies to pinpoint the breach within centimetres, avoiding unnecessary slab removal.

Yes. Thermal imaging is the optimal first step for underfloor systems. It visualises temperature anomalies caused by leaking warm water, mapping the leak's path through the screed.

Tracer gas is deployed for non-pressurised drains, complex pipe networks, or hard-to-access voids. The inert gas escapes at the leak point and is detected with extreme sensitivity, leaving no residue.

Yes. Our technical report includes annotated thermal images, moisture maps, and schematics that provide the evidence required for substantiating an insurance claim.

Our precision diagnostics limit investigation to a targeted area. By knowing the exact leak location beforehand, repair work is confined, preserving finishes and reducing operational downtime.

A commercial leak detection survey in London typically costs £550 to £1,250, depending on the building size, number of water circuits and access. Simple single-circuit jobs sit at the lower end; multi-let blocks, plant rooms and buried external mains cost more. Nationally, leak detection ranges from about £80 to £1,600 with an average around £500. Beware low hourly rates (£80–£120) — open-ended billing on a large building often exceeds a fixed survey price.

The property owner is responsible for the supply pipe from the property boundary into the building, plus all internal pipework — the water company only maintains the main and communication pipe in the highway. In multi-let buildings, communal risers and mains are normally the freeholder's or managing agent's responsibility (recoverable via service charge), while pipework serving one demised unit falls to that tenant or leaseholder. The lease wording decides borderline cases, so check it before commissioning work.

Often, yes. Under Thames Water's non-household code of practice, businesses can claim a leakage allowance for water lost through a hidden leak, submitted via their water retailer. Conditions apply: the leak generally must be repaired within six weeks of being confirmed, and claims fail if the leak was caused by negligence or you knew about it and delayed. Keep the detection report, repair invoice and dates — they form the evidence for the claim.

Most domestic leak investigations take one to three hours, but commercial surveys usually need half a day to a full day. Each water circuit must be isolated and pressure tested separately, and larger buildings have longer pipe runs to trace with acoustic and tracer gas equipment. Multi-storey or multi-let buildings with plant rooms can take longer. Out-of-hours surveys are worth asking about if isolating water during trading hours would disrupt the business.

Usually, through trace and access cover, which pays the cost of locating a hidden leak and making good the access work — though not the pipe repair itself or resulting damage, which fall under other policy sections. Domestic policies typically cap trace and access around £5,000; commercial policies often carry higher or unlimited limits. Insurers expect a professional report evidencing cause and origin, and most require the leak to be reported promptly, so do not delay.

Treat it as one. A metered commercial leak costs money continuously — industry figures suggest one litre per second can add around £60,000 a year to a water bill — and prolonged moisture damages screeds, electrics and stock, while delay can invalidate both insurance claims and water-company leakage allowances. If water is escaping fast, isolate the internal stop valve first. Then book detection quickly: prompt, documented action protects both the building and your ability to recover costs.