A smart leak shut-off valve is a motorised valve on your main water line that closes automatically, and alerts your phone, when a sensor detects water or the flow looks like a leak. It matters because water damage is a common home insurance claim: Suncorp found burst flexi-hoses caused about one in ten of its 2024 water damage claims.
- The valve sits on your main line and shuts the whole house off when it detects a leak.
- Spot sensors catch water on the floor; flow monitoring catches leaks you can't see.
- Insurers report water damage claims averaging well over $20,000 for burst flexi-hoses.
- Fitting a valve on the mains is licensed plumbing work, and it needs WaterMark.
What is a smart leak shut-off valve?
It's three parts working together:
- A motorised valve fitted to your main water line, after the meter. When it closes, water stops to the whole house.
- Sensors. Small battery puck sensors that sit on the floor under sinks, behind the washing machine, near the hot water system. Some valves also monitor flow in the pipe itself.
- An app. It alerts your phone, shows the valve's status, and lets you shut the water off from anywhere.
Think of it as a smoke alarm for water that can also turn the tap off.
How it detects a leak
| Method | How it works | Good at | Misses |
|---|---|---|---|
| Spot sensors | Detect water touching the sensor | Burst flexi-hoses, leaking appliances, overflowing sinks | Leaks where there's no sensor |
| Flow monitoring | Learns your normal use; flags flow that runs too long or too high | Burst pipes, running toilets, taps left on | Very slow drips, depending on sensitivity |
| Pressure test (some models) | Briefly closes the valve and watches for a pressure drop | Hidden slow leaks in walls and slabs | Needs a quiet period with no water use |
The best set-ups use more than one method. A sensor under the kitchen sink catches a hose that bursts at 2am; flow monitoring catches the pipe in the wall you'd never see.
Where household leaks usually start
Most indoor leaks start at a handful of predictable places, which is also where sensors should go.
- Flexi-hoses. The braided hoses that connect taps, toilets and dishwashers to the pipes. Suncorp's inspections found about 30% needed replacing, around two per household on average.
- Washing machine and dishwasher hoses. Under pressure all day, often behind an appliance where no one looks.
- Hot water systems. Tanks can corrode and fail, and relief valves can drip or discharge.
- Toilet cisterns. Inlet valves that stick open and run constantly.
- Pipes in walls and slabs. Rare, but slow and hidden, which is why flow monitoring matters.
Water Corporation notes that leaking pipes can also stir up sediment and discolour water. If your filter suddenly loads up with brown and nothing has changed on your street, it's worth checking for a leak.
Why it matters: what insurers' data says
Water damage is quiet, fast and expensive. The figures below come straight from Australian insurers and consumer groups.
| Source | What they found |
|---|---|
| Suncorp Insurance (2025) | Burst flexi-hoses caused about 1 in 10 home water damage claims in 2024, with an average claim of over $27,500. About 30% of flexi-hoses inspected needed replacing. |
| Budget Direct (2025) | Escape of liquid made up 19% of its home claims, with an average total claim cost of $23,843. |
| QBE (2021) | Water damage was nearly a quarter of its home insurance claims; burst or blocked pipes were behind 46% of incidents. One in five people couldn't find their water main. |
The common thread is time. A burst hose under a sink keeps running until someone notices and turns the water off. If you're at work, asleep or on holiday, that can be hours. A shut-off valve closes it in seconds.
The insurance angle
Two things are worth knowing. First, policies treat sudden and gradual leaks differently. CHOICE found all the insurers it compared cover sudden, accidental leaks, but cover for gradual leaks varies: 20% exclude it entirely, and others only cover hidden leaks a reasonable person couldn't have seen. Escape of liquid cover also doesn't pay to fix the thing that leaked.
Second, a valve doesn't change your policy on its own. If a discount for leak protection matters to you, ask your insurer directly. We won't promise a discount we can't guarantee. What a valve does is reduce how much water escapes, which is what drives the size of a claim.
Do you need a valve, or just alarms?
Battery leak alarms are cheap and need no plumber. They beep when water touches them, which is genuinely useful if someone is home to hear it. The gap is everything else: the night-time burst, the weekend away, the leak in the laundry while you're at work. An alarm tells you about water; a valve stops it.
A reasonable rule of thumb: if your home is often empty during the day, has an upstairs bathroom or laundry, or has older flexi-hoses you haven't checked, a valve is worth pricing. If someone is nearly always home and the wet areas are all on a slab, alarms plus a twice-yearly hose check may be enough. Either way, know where your water main is and how to turn it off. QBE found one in five people couldn't find theirs.
What to check before you fit one
- WaterMark and a licensed plumber. The valve connects to your water supply, so it needs WaterMark certification and a licensed install.
- Power and Wi-Fi at the meter. Check signal strength outside, and whether the valve has a battery backup or fails open or closed.
- Sensor placement. Kitchen sink, dishwasher, washing machine, hot water system, toilets, and under any upstairs bathroom.
- Holiday and away modes. Some valves can close the main on a schedule while you're away.
- Limits. It can't stop roof leaks, storms or flooding. It protects what's downstream of the valve.
If you're already having a whole house filter fitted at the meter, it's the ideal time: the plumber is on the main line anyway. Our smart leak shut-off add-on also sends filter-life alerts, so you know when a cartridge change is due. It's priced in your quote after your free water test, and only if you want it. See all add-ons.
Questions
How does a smart water shut-off valve work?
A motorised valve on your main line closes when a floor sensor detects water or when flow looks like a leak, and your phone gets an alert. You can also open or close it from the app.
Does a smart leak valve lower home insurance?
It depends on your insurer. A valve doesn't change your policy by itself, so ask your insurer whether they offer a discount for leak protection.
Do I need a plumber to install a water shut-off valve?
Yes, if it's fitted on the mains. That's licensed plumbing work in Australia, and the valve must be WaterMark certified.
What happens if the power or Wi-Fi goes out?
It depends on the model. Check whether it has a battery backup, whether sensors still trigger the valve locally, and whether it fails open or closed.
Will a leak valve detect a slow leak in the wall?
Flow-monitoring and pressure-test models can flag hidden slow leaks. Sensor-only systems only detect water that reaches a sensor.
Plumbing and installation details reviewed by a licensed plumber. See our editorial policy.
- Suncorp Insurance: flexi-hose media release (2025)
- Budget Direct: escape of liquid survey statistics (2025)
- QBE: water damage claims remain high (2021)
- CHOICE: home insurance for burst pipes and water leaks
- NSF: WaterMark certification for plumbing products
Written by the Whole Home Water team and checked against the sources above. General information only; your Home Water Check gives advice for your home.