Leak Detection Auckland

Water & Gas Worx provides professional leak detection services across all of Auckland, New Zealand. Call 0800 322 322 to locate hidden water leaks, gas leaks, and underground pipe failures in walls, floors, slabs, and yards — using thermal imaging, acoustic detection, and pressure testing. Qualified plumber and certified gasfitter.

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Written and reviewed by Peter — qualified plumber and certifying gasfitter, PGDB registered, 17+ years experience. Last updated April 2026.

Water Leak Detection in Auckland

Not every leak is obvious. A burst pipe flooding your kitchen is easy to spot. But the leaks that do the most damage are the ones you cannot see — water slowly seeping behind walls, under floors, through concrete slabs, or from buried pipes in the garden. By the time you notice, the damage is done.

We find hidden leaks using a combination of experience, pressure testing, and targeted investigation. Once we find the source, we fix it on the spot. No sending you to another tradesman — we diagnose and repair in the same visit wherever possible.

If your water bill has jumped, you have a damp patch that will not dry, or you can hear water running when nothing is on — call us. The sooner a leak is found, the less damage it causes.

Types of Leaks We Find & Fix

Hidden Pipe Leaks

Leaks inside walls and ceilings from corroded copper, failed joints, or pinhole corrosion. Common in older Auckland homes.

Slab & Underground Leaks

Water pipes running under concrete slabs or through the ground can leak for months before you notice. We locate and repair or reroute.

Hot Water System Leaks

Leaking cylinders, weeping valves, and dripping relief pipes. We diagnose whether it is a repair or replacement job.

Toilet & Fixture Leaks

Silent toilet leaks waste thousands of litres. Leaking shower trays and basins cause floor rot. We find the source and fix it.

Signs You Have a Hidden Leak

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Unexplained water bill increase — your usage has jumped but nothing has changed. This is the number one sign of a hidden leak.

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Damp patches on walls or ceilings — moisture appearing where it should not be. Often worse after rain or when hot water is running.

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Sound of running water — you can hear water flowing when all taps and appliances are off.

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Musty smell or mould — persistent dampness behind walls creates mould growth you can smell before you see it.

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Drop in water pressure — a leak in the supply line reduces pressure to the rest of the house.

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Wet patches in the garden — a soggy area in the lawn or path that never dries, even in summer.

How We Find Leaks

Leak detection is part science, part experience. Here is how we approach it:

Visual inspection — we check the obvious places first. Cylinder, valves, visible pipework, fixtures, and fittings. Sometimes the source is right there.
Pressure testing — we isolate sections of your plumbing and test them under pressure. If a section loses pressure, the leak is in that zone. This narrows the search quickly.
Meter check — with everything turned off, we watch your water meter. If it is still ticking over, water is going somewhere it should not be.
Targeted investigation — once we have narrowed it down, we open up the smallest area possible to confirm the source and make the repair. We do not rip out walls unnecessarily.

Most leaks are found and fixed in a single visit. For complex underground or slab leaks, we may recommend rerouting the pipe above ground rather than digging up concrete — it is often faster, cheaper, and avoids the same problem recurring.

Frequently Asked Questions

How do I know if I have a hidden leak?

The most common sign is an unexplained jump in your water bill. Other signs include damp patches on walls or ceilings, the sound of running water when nothing is on, musty smells, or a wet area in the garden that never dries. If you suspect a leak, turn off everything in the house and check your water meter — if it is still moving, you have a leak.

How much does leak detection cost?

We charge a fixed callout fee to attend, investigate, and locate the leak. The repair cost depends on what we find — a simple joint repair is different to rerouting an underground pipe. We will always tell you the cost before we start any repair work.

Can you fix the leak the same day?

In most cases, yes. We carry common parts and fittings on the van. For simple pipe repairs, joint fixes, and valve replacements, we repair on the spot. For more involved work like slab reroutes, we will quote and schedule it.

My water bill is high but I cannot see a leak — can you help?

That is exactly what we do. Hidden leaks behind walls, under floors, or underground are invisible until someone investigates. We pressure test, check the meter, and systematically narrow down the source. Most of the time we find it in one visit.

Should I turn off my water if I think there is a leak?

If you can see water flowing or a damp patch is growing, yes — turn off your mains toby valve at the street boundary. This stops the water supply while you wait for us. If you are not sure where it is, call us and we will talk you through it.