Leaking somewhere? we’ll track it down without tearing your place apart
Acoustic listening, thermal cameras, and pressure isolation testing locate leaks inside walls, beneath concrete slabs, along hot water runs, and in underground mains. Most jobs are found and repaired in a single visit.
Great Value Sydney Plumbing
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from$199Leak detection services across Sydney
Our three-method approach finds leaks that single-method detection misses. Whether the source is a corroded hot water line, a fractured main, or a slow seep beneath the slab, we locate it precisely and repair it with minimal disruption.
- Hot water system and cylinder leaks
- Slab leak location and repair
- In-wall and ceiling leak tracing
- Underground water main leaks
- Pool and spa leak investigation
- Meter-to-house line testing
- Thermal imaging surveys
- Pressure isolation and drop testing
30 min
Typical arrival time
500+
Google reviews
15+
Years serving Sydney
10,000+
Customers served
Hot water leaks rank among the costliest concealed plumbing faults in Sydney homes. A corroded copper hot water line running beneath a concrete slab can lose litres every hour while the only visible clue is a warm patch on the floor or a steadily climbing energy bill. Because heated water accelerates internal corrosion, hot water runs deteriorate faster than cold lines. Properties built before the mid-1990s are especially vulnerable; uncoated copper was standard for under-slab installations during that era. Sydney’s mineral-rich water supply compounds the problem, attacking pipe walls from the inside while alkaline concrete erodes them from the outside.
Beyond hot water runs, leaks conceal themselves in dozens of locations across a typical property. Cold water mains crack from ground movement and tree root intrusion. Shower recesses lose water through degraded waterproofing membranes. Cistern overflow valves fail silently, trickling water into the waste around the clock. Irrigation systems develop pinhole fractures underground. Each of these faults can persist for months before visible damage appears, and by that point the repair cost has compounded significantly.
Our detection process layers three complementary technologies for maximum accuracy. Acoustic listening equipment amplifies the high-frequency sound of pressurised water escaping through a pipe wall, even when that section is buried under 150mm of concrete or a metre of soil. Thermal imaging cameras reveal moisture migration patterns invisible to the naked eye, mapping exactly where water is spreading through a wall cavity, subfloor, or ceiling space. Pressure isolation testing then locks off individual sections of the plumbing system and measures pressure decay over time, confirming which specific line is losing water and ruling out false positives.
For slab leaks, precision saves money and structural integrity. Every centimetre of unnecessary concrete cutting adds cost and risk. Our equipment narrows the location to a small area, allowing a single targeted access point rather than exploratory trenching across the floor. For hot water cylinder and tempering valve leaks, we inspect the unit itself, the pressure relief discharge, and the connecting supply lines to determine whether the fault lies in the system or the surrounding plumbing.
Once the source is confirmed, we carry out the repair on the same visit wherever possible. The damaged section is exposed through a controlled access point, repaired or replaced with quality materials, pressure tested to verify integrity, and the area is made good. Every repair is backed by our lifetime workmanship guarantee.
Why choose us for leak detection
Triple-method accuracy
Acoustic, thermal, and pressure testing working together eliminate guesswork and false positives, even on complex multi-line plumbing systems.
Hot water leak specialists
We trace leaks in hot water cylinders, tempering valves, copper runs, and recirculation loops. Heated lines corrode faster, and we know where to look first.
One small access, not a trench
Precision detection means we open only what’s necessary. For slab leaks, that’s typically one targeted hole rather than cutting a channel across the floor.
Evidence you can see
We share thermal images, pressure readings, and acoustic data with you before recommending any work. Plain-English explanation, no jargon.
Pool and spa leaks covered
Individual line pressure testing and acoustic shell scanning locate pool leaks accurately, avoiding unnecessary excavation around the pool area.
Repaired the same visit
Detection and repair in one appointment. Exposed, fixed, pressure tested, restored, and guaranteed for life. One visit, one invoice.
Need Us Now?
We’re on call 24/7 across Sydney. We aim for around 30 minutes. No call-out fee and we quote before we start.
Typical arrival: 30 minutes or less
How we locate and resolve the leak
Acoustic scan
Sensitive listening equipment detects the sound of water escaping through pipe walls, even beneath concrete and soil.
Thermal mapping
Infrared cameras reveal moisture movement and temperature anomalies hidden inside walls, under floors, and across ceilings.
Pressure isolation
Individual plumbing lines are locked off and monitored for pressure decay, confirming exactly which section is losing water.
Targeted repair
A single controlled access point exposes the fault. We repair, pressure test, restore the area, and guarantee the work for life.
15+ years finding what others miss
Accurate detection, lasting repairs
Unexplained water bills. A damp smell that won’t shift. A warm spot on the slab where there shouldn’t be one. These are signs that a concealed leak is active, and every day it continues the damage grows. Hot water line leaks are particularly destructive because warm moisture accelerates mould growth and timber deterioration far faster than cold water does.
We combine acoustic, thermal, and pressure testing to find the precise source, then open one small area, complete the repair, confirm it under pressure, and back it with our lifetime guarantee. Detection and repair in a single visit, with minimal disruption to your home.
Call Us: 1300 349 338What Sydney Customers Say
Hurstville
Hot water line leaking under the slab for who knows how long. They pinpointed it within an hour and repaired it the same afternoon. Saved us from a much bigger problem.
5 days ago
Marrickville
Water bill doubled and we had no clue why. They found a cracked main near the meter box using acoustic gear. Sorted in one visit. Very impressed with the whole process.
2 weeks ago
Sutherland
Pool losing water every day. They pressure tested each line individually and found a fracture in the return run. Precise, professional, and fair price.
3 weeks ago
Epping
Damp patch kept appearing on the bathroom wall. Thermal camera showed exactly where the hot water line had corroded inside the wall. Fixed same day, no mess. Would absolutely use them again.
1 month ago
Local Hot Water and Plumbing Team
Questions We Get Asked
- How do you detect a hot water leak under a concrete slab?
- We use acoustic listening equipment to identify the sound of pressurised water escaping through the pipe wall beneath the concrete. Thermal imaging then maps the heat signature of the escaping hot water as it spreads through the slab. Pressure isolation testing on the hot water line confirms the location. This combination narrows the leak to a small area, allowing a single targeted access hole instead of wide-scale concrete cutting.
- Why do hot water lines leak more often than cold water lines?
- Heated water accelerates chemical corrosion inside copper pipe walls. Constant thermal cycling also causes expansion and contraction stress at joints and bends. In Sydney, mineral content in the water supply reacts with copper over decades, creating pinhole corrosion from the inside while alkaline concrete attacks from the outside. Hot water runs under slabs experience both conditions simultaneously, making them the most vulnerable section of a home’s plumbing.
- My water bill has increased but I can’t see any leaks. What should I do?
- Start by checking your water meter. Turn off every tap, appliance, and irrigation system in the property. Record the meter reading, wait at least two hours without using any water, then check again. If the numbers have changed, water is leaving the system somewhere you can’t see. Contact us for professional detection. Many concealed leaks, especially under slabs and inside wall cavities, produce no visible signs until significant damage has already occurred.
- Will leak detection damage my property?
- The detection process itself is completely non-invasive. Acoustic, thermal, and pressure testing are carried out from accessible points without any cutting, drilling, or digging. If a repair is needed, we make one small, targeted access point at the confirmed leak location. This is significantly less disruptive than exploratory methods that involve cutting trenches or removing large sections of flooring to search for the source.
- Can you detect leaks in swimming pools and spas?
- Yes. We pressure test each individual pool line separately to determine which one is losing pressure. Acoustic equipment locates shell leaks by detecting water movement through cracks or failed fittings. Normal evaporation in Sydney during summer is approximately 3 to 5 millimetres per day. If your pool drops faster than that, a leak is likely present in the shell, return lines, suction lines, or fittings.
- What does leak detection cost in Sydney?
- We provide a fixed price before beginning any work. The cost varies depending on complexity. A straightforward wall or ceiling leak costs less to locate than a deep slab leak or underground main. There is no call-out fee and no hidden charges. You’ll always know the full cost before we start.
- Is it possible to repair the leak on the same visit?
- In most cases, yes. Our vans carry the parts and materials needed for common repairs. Once detection confirms the location, we expose the fault through a controlled access point, complete the repair, pressure test to verify integrity, and restore the area. Everything is backed by our lifetime workmanship guarantee.
- Can a slow leak cause structural damage to my home?
- Absolutely. Persistent moisture beneath a concrete slab can erode the sand bed supporting it, causing the slab to crack or sink. Water inside wall cavities promotes mould growth, timber rot, and corrosion of steel fixings. Over months, even a slow drip can compromise structural framing, destroy plasterboard, and create health hazards from airborne mould spores. Early detection prevents all of this.
- Does home insurance cover leak damage?
- Most policies cover sudden and accidental water damage, such as a burst connection. However, gradual damage from a leak that was left unattended for an extended period is often excluded. Detecting and repairing leaks promptly strengthens your position if a claim becomes necessary. We provide detailed documentation of the detection findings and repair for insurance purposes.
- How can I tell if my hot water system is leaking?
- Common signs include puddles or moisture around the base of the unit, a pressure relief valve that drips constantly, higher than expected energy bills, reduced hot water volume or temperature, and rust-coloured staining on nearby surfaces. If the cylinder is inside the house, check for dampness on adjacent walls or flooring. For units installed on concrete slabs, look for warm or discoloured patches on the floor nearby.