Leak detection is the process of finding a hidden water leak without digging up your whole floor. In Glasgow, an engineer will typically start with a pressure test and moisture meter readings, then use acoustic listening equipment, thermal imaging or tracer gas to pinpoint the exact position before anything is lifted. A domestic leak detection survey costs £180 to £450 depending on the method, and it is almost always cheaper than the exploratory damage caused by guessing.
If you have an unexplained damp patch, a water bill that has climbed for no reason, or a heating system that keeps losing pressure, this guide explains how the leak is found and what it costs.
Signs You Have a Hidden Leak
- Boiler pressure keeps dropping and you are topping up more than once a month.
- A damp patch or tide mark on a wall, ceiling or skirting that does not dry out.
- Warm spot on the floor often a leaking heating pipe under screed.
- Water meter creeping when every tap and appliance in the house is off.
- Musty smell in a cupboard or under a floor with no visible source.
- Loose tiles, lifting laminate or blown plaster in one localised area.
- Sound of running water when nothing is in use.
Not all of these are leaks. Cold bridging and condensation in older sandstone properties produce damp that looks identical to a plumbing leak. Distinguishing the two is the first job.
How Leak Detection Actually Works
Moisture mapping
A calibrated moisture meter and a hygrometer establish where the water is and, more importantly, whether the pattern is consistent with a leak or with condensation. This step is quick and rules out a lot of false alarms.
Pressure testing
Isolating sections of the plumbing or heating circuit and holding them under pressure tells the engineer which circuit is failing. On a sealed heating system this narrows an entire property down to one loop in under an hour.
Acoustic detection
Pressurised water escaping through a small hole makes a distinctive noise that carries along the pipe. Ground microphones and correlators amplify it, which works well on mains supply pipes and buried services.
Thermal imaging
A thermal camera shows temperature differences through floors and walls. It is the fastest way to find a leaking heating pipe under a screed or a hot water pipe behind plaster, because the leak is warmer than everything around it.
Tracer gas
A safe hydrogen and nitrogen mix is introduced into the drained pipe. The gas escapes through the leak, rises through floor and screed, and is picked up by a detector at the surface. It is the most precise method and the usual answer when everything else has narrowed it down but not pinpointed it.
Leak Detection Costs in Glasgow (2026)
| Service | Typical Glasgow price (2026) |
|---|---|
| Moisture survey and pressure test | £120 – £220 |
| Acoustic leak detection | £180 – £320 |
| Thermal imaging survey | £200 – £380 |
| Tracer gas detection | £280 – £450 |
| Detection plus repair (accessible pipe) | £350 – £700 |
| Emergency out-of-hours attendance | £110 – £180 on top |
Many buildings insurance policies include trace and access cover, which pays for finding the leak and making good afterwards. Check your policy before you book it can change what the job costs you to nothing.
Glasgow-Specific Considerations
Tenement and conversion flats are the hardest cases, because water travels. A leak on the second floor commonly shows first as a stain on a first-floor ceiling, several metres away from its source. Detection in a close often needs access to more than one property, and it is worth asking neighbours early rather than after the ceiling comes down.
Solid stone walls and suspended timber floors in older Glasgow city centre and Southside properties also hold moisture for weeks, so a damp meter alone rarely gives an answer. Newer homes in East Kilbride and Paisley with screeded floors and underfloor pipe runs are where thermal imaging and tracer gas earn their money, because lifting screed on spec is expensive and irreversible.
What to Do Right Now
- Turn off the stopcock if water is actively escaping, and note whether the damp stops spreading.
- Read your water meter, use no water for two hours, and read it again. Movement means a leak on your supply.
- If it is the heating, note the pressure gauge before and after topping up, and how fast it falls.
- Photograph the damp area with a date, which helps any insurance claim.
- Do not start opening floors or hacking off plaster that is what the survey is for.
If the water is coming from a heating pipe, our central heating team handles both detection and repair. If it is a sudden burst, call our emergency plumber line first and worry about the survey afterwards.
Why Choose a Gas Safe Certified Engineer?
Leaks frequently sit on heating circuits, which means working around boilers, pumps and gas pipework. A registered Gas Safe engineer can isolate, drain, repair and refill the system safely and recommission the appliance afterwards, which an unregistered leak-detection specialist cannot. You can check any engineer’s card on the Gas Safe Register. Our wider plumbing and heating services cover the repair as well as the survey.
You may also like our guides on emergency radiator leaks and what to do about a burst pipe.
Frequently Asked Questions
How much does leak detection cost in Glasgow?
Between £120 and £450 depending on method. A moisture and pressure survey sits at the lower end; tracer gas at the upper end. Detection plus an accessible repair typically lands between £350 and £700.
Is leak detection covered by home insurance?
Often, under trace and access cover. It pays for locating the leak and repairing the damage caused by accessing it, though not always the failed pipe itself. Check the wording before booking.
How accurate is it?
Tracer gas typically pinpoints to within a few centimetres. Thermal imaging and acoustic methods usually narrow it to a small area, which is enough to lift one board rather than a whole floor.
Can you find a leak without damaging my floor?
That is the entire point of the survey. Detection is non-destructive; only the repair itself requires access, and by then we know precisely where to open.
My boiler pressure keeps dropping but I see no water. Why?
Small heating leaks often evaporate on warm pipes or drain through a discharge pipe outside. A failed expansion vessel produces the same symptom with no leak at all, which a pressure test distinguishes quickly.
How quickly can you attend?
Emergency attendance is same day across Glasgow. Planned detection surveys are usually booked within a few days.
Ready to Get Started?
Precision Renovators are Gas Safe certified plumbing and heating engineers covering Glasgow and the surrounding towns. We find the leak before we open anything, quote the repair at a fixed price, and document everything for your insurer. Browse our services or see our projects.
Get a Free Quote or call and WhatsApp us on 07495 816227.
