The worst leaks are the quiet ones. Here's how to read the clues your house is giving you — and a simple test that tells you whose pipework the problem is on.
Think you've got a hidden leak in Larne? Turn every tap and appliance off, close the main stopcock, and watch: if a damp patch stops growing or the hiss of running water stops, the leak is on your own pipework. If water is near electrics, or a ceiling is sagging or spreading while you watch, treat it as urgent and call 020 4577 2888 to be connected with a local plumber.
Houses rarely stay quiet about escaping water — you just have to know what counts as a clue:
Most homes in Northern Ireland aren't metered, so a surprise water bill won't warn you the way it might elsewhere — the house itself is usually the first witness. If your home does have a meter, it becomes a useful instrument, as below.
The stopcock test is honest and free. Turn off every tap, appliance and the heating system, then close the main stopcock — usually under the kitchen sink. Now watch and listen: if the damp patch stops growing, or the hiss of water stops, the leak sits on your own pipework, downstream of the stopcock. If you have a water meter, add the second half: with the stopcock open again but nothing using water, read the meter, wait 30 to 60 minutes without running anything, and read it again — any movement means water is escaping somewhere between the meter and your taps. Neither test tells you exactly where the leak is, but both tell a plumber a great deal before they lift a single floorboard.
Three situations upgrade a hidden leak from "investigate" to "act now": water anywhere near sockets, light fittings or appliances; a sagging or bulging ceiling, which can be holding a surprising weight of water; and a damp patch that's visibly spreading while you watch. In any of those, shut the stopcock, switch the electricity off at the consumer unit if you can do so safely, keep everyone from under a bulging ceiling, and make the call. Our burst pipes guide covers the emergency drill in full.
The Victorian and Edwardian terraces around Larne, and mid-century homes with plumbing updated piecemeal over the decades, often mix pipework of very different ages — and the joints between old and new are where slow weeps like to start, quietly, behind panels and under floors. Homes closer to the coast, from Larne out towards Islandmagee, also see faster wear on external pipework and fittings from the salt-laden air. None of that makes a leak inevitable; it just means a small damp clue in an older house has earned a proper look rather than a fresh coat of paint over the stain.
Only if you have one — most homes in Northern Ireland aren't metered, so don't count on a bill to warn you. If your home does have a meter, the test is simple: read it, use no water for 30 to 60 minutes, and read it again. Movement on the dial with everything switched off means water is escaping somewhere.
A sealed heating system that needs topping up again and again is losing water somewhere — often through a weeping radiator valve, a joint under a floor, or a faulty internal component. The escape can be small enough never to show as a visible patch, which is exactly why repeated pressure loss deserves investigation rather than another top-up.
It can be. A persistent musty, damp smell in one room — especially with no obvious condensation cause — often means moisture is getting into a wall, floor or void where you can't see it. Treat it as a prompt to look closer: check nearby pipework, skirting and flooring, and try the stopcock test.
When water is anywhere near electrics, when a ceiling is sagging or bulging, or when a damp patch is visibly spreading while you watch. In those cases turn the water off at the stopcock, switch the electricity off at the consumer unit if you can do so safely, keep clear of a bulging ceiling, and call for help straight away.
As a general rule in the UK, the supply pipe from your boundary into the house is the owner's responsibility, while leaks on the public side are the water utility's — in Northern Ireland, NI Water's side of things. If water keeps coming with your stopcock shut, or it's surfacing outside, the fault may not be on your side at all.
The main page — what this line is and how it works.
Go to home →The first five minutes: stopcock, taps, electrics.
Read the guide →Pressure basics, no heat, error codes — and gas safety.
Read the guide →Pressure, timer, tripped switch — the checks before you call.
Read the guide →Prevention, gentle thawing — and what never to use.
Read the guide →What to try first and when it's a main-drain problem.
Read the guide →Honest ballparks and the questions to ask before work starts.
Read the guide →Call any time, day or night, to be connected with a local plumber covering Larne and the surrounding villages.
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