If your boiler needs re-pressurising every few days, something is taking water out of the system. Sometimes it’s the boiler itself (a faulty pressure-relief valve or expansion vessel, a job for a Gas Safe engineer). But very often the culprit is a small hidden leak on the heating pipework, under a floor, in a wall, or beneath a bathroom.
Signs it’s a pipework leak, not the boiler
- Pressure drops steadily whether or not the heating runs
- A warm patch on a floor that’s always in the same place
- A damp smell, lifting flooring, or a stain that keeps returning
- Your boiler engineer has checked the boiler and found nothing wrong
Why you shouldn’t start lifting floors
Heating circuits run under floors and through walls all over the house. Guessing means holes, and every wrong guess is a repair bill. Professional detection finds the leak first: thermal imaging shows the heat signature of escaping hot water, tracer gas pinpoints the exact spot, and moisture mapping confirms the extent. Here’s exactly how that works.
Will insurance help?
If the leak has caused damage, many buildings policies include trace-and-access cover for the cost of finding it, our plain-English guide explains. We produce insurer-ready reports from the visit.
What it costs
Fixed survey pricing, confirmed before we attend, see what leak detection costs, or go straight to our leak detection service.
Think this is happening in your home? 📞 Call free: 0800 054 1524 · 💬 WhatsApp: 07733 019492 · or send us a message. We cover London & Surrey, every inspection is quoted based on the job and the price is confirmed before we attend.
Last reviewed: 27 October 2026. Independent investigation and written reports. Repairs are quoted separately.