Found systematically rather than by walking the block, because on this much ground a leak can run for months somewhere nobody goes.
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A leak in the lawn beside the back door announces itself within days. Somebody stands in it.
On a larger block a great deal of the property is not like that. A corner behind a shed, ground under established planting, a run along a boundary nobody has reason to visit. A leak there can run for months, and frequently the water bill is the first anybody hears of it.
Which means walking around looking for a wet patch is not a method here. It works on a small block and it quietly fails on a large one.
So we do it systematically: the meter to confirm water is being lost with everything off, pressure testing to isolate which line, then acoustic listening to locate it along the run. That sequence does not care how much ground there is.
On a block this size that is entirely normal. The meter test settles whether water is being lost in about half an hour.
Behind a shed, under planting, along a boundary, beyond a hedge. On a larger block there is a great deal of ground nobody has reason to walk across for months at a time.
So a leak on an external line can run in ground nobody sees, and what surfaces disperses into soil that gets watered anyway.
That is the difference between a large property and a small one, and it changes the whole approach.
Walking around for a wet patch works on a small block and quietly fails on a large one. It produces a false sense of having checked.
Absence of a wet patch is not evidence of anything here. Plenty of real leaks produce nothing visible at all.
Which is why the sequence below starts at the meter rather than at the garden.
Meter with everything off to confirm loss, pressure testing to isolate the line, then acoustic or thermal locating to find the point. In that order, every time.
Each step narrows the problem before the next one starts, which is what keeps the cost down. Skipping to locating on an unconfirmed loss wastes a visit.
It is a genuinely reliable process rather than a search, and it is the reason detection is worth paying for.
Close every tap, the machine and the dishwasher, and watch the smallest dial for a couple of minutes. Movement means water is genuinely leaving on your side.
Turn any irrigation controller off entirely rather than to a rest day, or it will run during your measurement and confuse the result.
A dial that sits perfectly still points at usage rather than a fault, and on a large property that usually means irrigation or a pool.
Shut the valve on the inlet to the hot water system and watch the dial for another couple of minutes. That one action narrows the search to half the property.
If it keeps creeping, the loss is on the cold side and the unit is not involved. If it stops, you are looking at the unit or the hot distribution beyond it.
One thing to rule out first on a hot result: a relief valve dribbling steadily reads identically on a meter and is a small, cheap repair rather than a hidden leak.
Usually near the front boundary, which here can be a long way from the house. That distance matters at two in the morning in the rain with water rising.
Check the tap actually turns while you are there. On older properties they seize, and a seized one is its own small job on a quiet Tuesday.
Make sure somebody else in the household knows too, because the person who reads pages like this is not always the person who is home.
On a large garden a reticulation system can move more water than the household does, and a failed solenoid or a split poly line does what a leaking cistern does: continuously, invisibly, into ground where water belongs.
It is silent, it is underground, and it runs when nobody is awake. There is nothing to notice and nothing to walk past.
The bill is usually the only symptom, which is why a jump with no change in habits is worth acting on.
Sydney Water may grant a hidden leak allowance for a genuinely hidden leak repaired promptly. The detail of what qualifies is theirs rather than ours and it is worth reading their own material.
What we can say is that documentation helps. The date the loss was identified, what was found, and what was done to repair it are all things a written report can record.
We are plumbers rather than assessors, so we will not tell you what you are entitled to. We will describe accurately what a plumber found.
Manufacturers commonly nominate about five years for them, and they do not weep first as a warning. A braided hose holds until it does not, and then it releases at full mains pressure.
They live in cupboards nobody opens, which means a failure can run for hours before anybody notices, and frequently starts while the house is empty.
Replacing the lot on an average property is a short visit and a small invoice. It is the best value preventative work available anywhere on this site.
Water follows the fall of a joist, the back of a stud or the top of a slab and appears wherever it finally escapes. A ceiling stain can be metres from the fitting that failed.
So the wet spot is a starting point rather than a location, and cutting into it is frequently the wrong first move.
On a house with original finishes, locating properly is the difference between a repair and a restoration.
The domestic ceiling is 500 kPa static at any outlet, and the valve that holds it there wears out at around eight to twelve years. It fails open, so nothing warns you.
Read the symptoms together. Taps that keep dripping after repair, water hammer that was not there before, and appliance inlet valves failing early all point the same way.
It is a gauge and two minutes, and higher pressure means a buried leak loses more water and does it faster.
On a large property this is the normal way a leak announces itself, because there is nothing to see and nobody walking the ground where it is happening.
The order of work is the meter test, then the hot water isolation, then the run between the meter and the house.
That last one is the expensive possibility and the one worth ruling out early, because on a long service line it is also a likely one.
Fixed price agreed before anyone starts. These are indicative 2026 ranges, with location priced separately because on a block this size it is the part that takes the work.
Meter, pressure isolation and acoustic listening, worked systematically.
Once exposed, depending on depth, material and what sits above it.
Including checking the others, because they are all the same age.
Water off, the leak isolated and the property stabilised, at any hour.
What failed and where, in a form Sydney Water will accept with an allowance request.
With everything off, to confirm water is genuinely being lost before anybody starts searching for where.
Pressure testing narrows it to a run rather than a property, which on this much ground is most of the work.
Acoustic listening places it, so one hole finds the fault rather than several finding nothing.
What failed and where, with the licence number and ABN Sydney Water asks for on an allowance request.
Get to the meter and turn it clockwise, then call. If you cannot find it, ring anyway and we will talk you through where to look.
Call 1300 381 569What the North Shore locals ask us before booking a plumber.
Ask us yours
Because on a larger block there is a great deal of ground nobody walks on. A leak in a lawn beside the house announces itself within days. The same leak in a corner of the property, under planting, behind a shed or along a boundary, does not. The bill is frequently the first anybody hears of it.
Usually near the front boundary, which on a larger block can be a long way from the house. It is worth finding it on a quiet afternoon rather than in the dark during a burst, and worth checking it turns, because a tap that has not moved in fifteen years frequently does not want to.
Systematically rather than by walking around. The meter confirms water is being lost with everything off, pressure testing isolates which line, and acoustic listening locates it along the run. That sequence works regardless of how much ground there is, which walking around does not.
It is worth checking. Grass over a leak stays green when the rest does not, and on a larger block that contrast is often the first visible sign. It is not proof, and the meter test settles it either way in half an hour.
Possibly, though a visible sign works against it. Sydney Water may grant a hidden leak allowance where a licensed plumber has repaired a genuinely hidden leak, and they treat damp soil or consistently wet grass as visible. Worth asking about, and we put the licence number and ABN they want on the invoice.
One of the most common indoor failures, and they fail suddenly rather than gradually. Replacing them all in a planned visit costs a fraction of one letting go overnight.
Detection and location is $250 to $550, which covers doing it systematically rather than guessing across a large block. A burst repaired once exposed is $350 to $900. A failed flexi hose replaced is $180 to $350.
Tell us roughly how big the block is, whether anything is visible, and whether you know where the meter is. Those three shape the search.
Located systematically, fixed price agreed first, and written findings you can use with Sydney Water.
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