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
Balmain East
A leak you cannot see is still on the meter, still under the slab, still soaking the wall cavity. We find them with listening gear, thermal imaging and pressure testing, so the repair needs one small hole in the right place, not three big ones in guesses.
- Licence 368473C, fully insured
- Acoustic, thermal & pressure instruments
- Found and fixed by the same crew
Three Instruments, One Answer, In Balmain East
A hidden leak cannot help giving itself away three times over. Escaping water under pressure sings at frequencies acoustic gear can chase along a pipe run; it changes the temperature of whatever it soaks, which thermal imaging paints in false colour through wall sheeting and slab surfaces; and it bleeds pressure from whichever isolated section of pipework it lives on, which a gauge catches cold. One signal suggests; three signals triangulate.
That triangulation is what you are actually buying. Where the readings converge, we mark the floor, and in Balmain East’s renovated homes, where pipework wanders in ways no council plan ever recorded, that mark routinely sits metres from where anyone would have started digging on instinct. The difference between those two points is the difference between lifting three tiles and re-doing a bathroom.
High water table, and what it hides
Mature gardens and established street trees on the peninsula send roots hunting into hairline cracks in old sewer lines, a top cause of recurring blockages.
Close to the water the ground is frequently wet regardless of any plumbing fault, which removes the most obvious diagnostic anybody has. Damp subfloor, moisture in the slab edge and standing water in a trench prove nothing here.
So detection near the water leans on isolation and the meter rather than observation, and on tracer gas where a leak is genuinely hidden by ambient groundwater.
Working in a house that cannot simply be opened up
Balmain East’s original terraces still run earthenware pipework laid over a century ago, and cracked joints in that old clay are a leading cause of blockages here.
Lath and plaster, pressed metal ceilings, original tiling and heritage listings all raise the cost of being wrong. In a period home the value of precise location is not the plumbing saved, it is the finishes not destroyed.
So we locate to the smallest area the equipment will support, and where a listing is in play we document what we propose to open before anything is touched.
Retaining walls, terraces and the services behind them
The peninsula’s steep run down to the harbour sends heavy-rain runoff surging through stormwater pits that choke and back up.
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
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.
Salt, damp and the fittings that go first
Corrosion works faster in humid, salt-carrying air, and the parts that fail earliest are the small ones: tap bodies, external fittings, and the connections around a hot water unit.
Balmain East sits right at the tip of the Balmain peninsula (postcode 2041), a harbourside pocket of Victorian terraces and converted warehouses stepping down steep streets to the ferry wharf. Bordering Balmain and looking across the water to the city, its ageing drainage sees everything, and we know the local ground well.
Many of the leaks we find on properties near the water are not in the pipework at all but at a fitting that has been quietly corroding in plain sight. They are also the cheapest to put right, if found before they let go.
What it costs in Balmain East
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.
Compare it with exploratory demolition, which costs more than detection before it has even guessed right once. 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
Prove There Is A Leak
The meter test, done properly, plus your bills and history. If the evidence says no supply leak, you hear that, not a bill for finding nothing.
Step 02
Isolate The Section
Pressure-testing the pipework in sections, hot against cold, line by line, corners the leak into one run before any listening starts.
Step 03
Pinpoint It
Acoustic gear and thermal imaging along the guilty run until the readings converge. The mark on the floor is where the repair happens, centimetres, not metres.
Step 04
Repair Through One Hole
Access exactly at the mark, the failed section repaired, pressure-tested, closed up. If the line's condition says reroute instead of repair, you get both numbers first.
Meter Creeping With Everything Off?
Then the leak is real and already on the clock. Book the detection before it surfaces somewhere 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.
A standard detection visit generally runs $350-$650 depending on the size of the property and how much isolating is involved. Tracer gas or extensive thermal work sits above that. Market figures for 2026, not a quote, and if the meter test says there is no leak, you are told that rather than sold the rest of the process.
Frequently, near the water. Wind-driven rain, a high tide against a low subfloor and stormwater with nowhere to go all produce moisture that looks like a leak. The tell is timing, damp that tracks the weather is not plumbing, damp that is constant usually is. Keep a note of when it appears.
Yes, and establishing where the pipes actually run is half the job on an older property. Original runs, a post-war bathroom teed in somewhere unexpected, a laundry added in the sixties, tracing the layout is what prevents opening the wrong wall.
Yes, even if the volume looks small. Saturated backfill is what makes retaining walls move, and the plumbing repair is minor compared with what rebuilding a wall costs.
Usually 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. Unglamorous, cheap, and conclusive in a way that sniffing around is not.
Locate It This Week Anywhere In Balmain East
Instruments, evidence, one precise repair: and a bill that goes back to normal.
