Basic detection, $200–$400
Straightforward jobs: a limited pipe run, good access, the leak confirmed and marked.
Leaks Found, Not Guessed
Find That Leak
Fast Across
Baulkham Hills
Somewhere between the meter and your taps, water is escaping, you can see it on the bill even when you cannot see it anywhere else. We pinpoint concealed leaks across Baulkham Hills with instruments instead of crowbars, so the repair opens one small hole in exactly the right place.
- Licence 368473C, fully insured
- Acoustic, thermal & pressure testing gear
- Detection and the repair: one crew, one visit
Three Instruments, One Answer, In Baulkham Hills
Every concealed leak makes three things: a sound, a temperature difference, and a pressure drop. The gear reads all three. Acoustic equipment listens for the specific frequency of water escaping under pressure and gets louder as we track along the line; thermal imaging paints the wet path through a wall or the warm plume of a leaking hot line under a slab; and isolating sections of pipework against a pressure gauge proves exactly which run is losing water and which is sound.
Cross-referenced, they put an X on the floor within centimetres. That precision is the entire point, the difference between lifting three tiles and re-tiling a bathroom. It matters double under Baulkham Hills’s older homes, where pipes wander in ways no plan ever recorded, and the "obvious" place to dig is reliably wrong.
The clues that show up in the building first
Homes from the 70s to 90s often still run original clay pipework that cracks and shifts as the suburb’s reactive soil dries and swells.
Long-running leaks in reactive soil often announce themselves through the structure rather than the plumbing: a door that has started binding, a hairline crack above a window, floor tiles lifting in one corner.
Those are worth mentioning when you call. A pattern of movement in one part of the house tells us where to look before a single instrument comes out of the van.
Shower recesses: the most common leak in any block
Failed waterproofing in a shower is the single most frequent source of inter-lot water damage in strata, and it rarely presents as a leak at all, it presents as a damp patch on a neighbour's ceiling months after the membrane gave up.
Newer townhouse developments share drainage runs, so a single blockage needs a camera and the right access to clear the whole line properly.
It is worth ruling in or out early because it is a building repair rather than a plumbing one, and the process for approving and funding it is different. Flood testing the recess is inexpensive and definitive.
Retaining walls, terraces and the services behind them
Baulkham Hills’ mature street trees and established gardens send roots probing into old pipe joints, a leading cause of recurring blockages here.
Sloping blocks are full of retaining structures, and pipework often runs behind or beneath them because there was nowhere else to put it. A leak in that position saturates backfill, and saturated backfill is what makes retaining walls move.
Water showing at the base of a wall is worth treating as urgent even when the volume looks trivial. The plumbing repair is small compared with what the wall costs.
Smell as evidence
The Hills’ heavy clay swells in the wet and shrinks in the dry, cracking joints and pulling pipes out of line so waste snags and backs up.
A persistent sewer smell around a property with no obvious source is worth investigating properly. It usually means either a dry or failed trap, or a break in a line venting where it should not.
A smoke test finds both quickly, introduce smoke into the system and watch where it emerges. It is unglamorous, cheap, and conclusive in a way that sniffing around is not.
Ground that moves, and the leaks it starts
Reactive ground swells and shrinks with moisture, and it does not do it evenly across a property. Anything rigid crossing that ground is worked at its weakest point until something opens, usually a joint, usually slowly.
It is why leaks in this kind of country tend to appear after the seasons turn rather than during a single event, and why the same property can produce a second one years later a few metres from the first.
Water coming through the ceiling
The apartment showing the damage is almost never the apartment with the fault. Water tracks along the top of a slab, through penetrations and down whichever path is available, which can be several metres laterally before it enters your ceiling.
Thermal imaging and moisture mapping from below will usually establish the direction it is arriving from, which narrows the source before anyone needs access to a neighbour's bathroom.
What it costs in Baulkham Hills
Typical first hour, $300–$500
The standard concealed-leak hunt with the full kit on site, acoustic, thermal, pressure testing.
Extended tracing, $100–$250/hr after
Long pipe runs, poor access or multiple leaks add gauge-and-listen time past the first hour.
Hard-to-access leaks, up to ~$900
Deep slab lines and complex multi-storey tracing sit at the top of the Sydney range.
The repair, priced on what we find
Detection tells you exactly what the repair involves, so the repair quote is built on evidence. One crew does both, no handover, no second call-out fee.
The comparison to hold onto: exploratory demolition costs more than detection before its first guess is even wrong. Figures here are indicative of the 2026 Sydney market rather than a quote from us, you get your own number as a fixed price before any work starts.
The Hunt, In Four Moves
Step 01
Step 01
Verify The Leak Exists
Meter protocol, bills, history. If the evidence says no supply leak, you hear that for free, not a finding fee for nothing.
Step 02
Convict One Line
Section-by-section pressure isolation, hot against cold, run against run, until exactly one line owns the loss.
Step 03
Mark The Centimetres
Thermal and acoustic sweeps along the guilty run until the signals stack on one spot. That mark is where, and only where, we open.
Step 04
One Hole, Done
Access at the mark, section repaired, pressure re-tested, surface closed. A run in terminal condition gets reroute numbers before, not after.
Failed The Meter Test Just Now?
That is a leak, and it is not fixing itself. Book the detection before it surfaces through something expensive.
The meter test, and it is free. Turn off every tap and appliance that uses water, read the meter including the smallest dial, then check again an hour later without using anything. If the reading has moved, water is leaving the property. If it has not, you do not have a pressurised leak, which rules out a lot before you spend anything.
It is elimination, not one instrument. Isolate sections and watch the meter to find which line is losing water, then listen along it with acoustic equipment for the sound escaping water makes. Where that is inconclusive, tracer gas is introduced into the isolated line and detected at the surface.
Because excavation is where the money goes, and water rarely surfaces where it escapes. The plumbing repair on a typical service leak is minor; getting to it is most of the cost, and getting to the wrong place is all of the cost with none of the benefit.
It can be. Long-running leaks in reactive ground often show up through the structure first: a door binding, a hairline crack above a window, tiles lifting in one corner. Mention it when you call, a pattern of movement in one part of the house tells us where to look.
Very commonly. Failed waterproofing in a shower recess is the single most frequent source of inter-lot water damage in strata, and it presents as a damp ceiling patch months after the membrane gave up. Flood testing the recess is inexpensive and definitive, and it is a building repair, not a plumbing one.
Uphill of where you see it. On sloping ground water follows the easiest path underground until something stops it, so it can emerge metres away and always further down. We correlate uphill from the symptom rather than digging at the evidence.
Yes. Reactive soil swells when wet and shrinks when dry, unevenly across a block. Anything rigid crossing it is worked at its weakest point until something opens, usually a joint, usually slowly. Failures here follow the seasons turning rather than a single event.
Pinpoint The Leak This Week In Baulkham Hills
Instruments, a mark on the floor, one hole, one fix: and the meter finally standing still.
