A burst water pipe can push out hundreds of litres an hour. Within minutes, water soaks into plasterboard, timber floors and carpet, and it can reach power points and light fittings. What you do in the first ten minutes decides whether you’re looking at a simple repair or weeks of drying, mould treatment and replastering.
This guide walks you through exactly what to do when a pipe bursts: how to stop the water, how to make the house safe, who to call in Sydney, and what a burst pipe repair usually involves and costs. It’s written for Sydney homes, so it covers local issues such as Sydney Water’s responsibilities, high mains pressure, clay soil movement and ageing galvanised pipes, rather than the frozen pipes you read about in overseas guides.
Water pouring out right now? Turn off your main stop tap, then call Radiant Plumbing on (02) 8866 1322. Licensed burst pipe plumbers, available 24/7 across Sydney, with $0 call-out fee. [Book online]
What To Do When a Pipe Bursts: 7 Emergency Steps
If you have a pipe burst in the house, work through these steps in order. The first two matter most.
- Turn off the water at the main stop tap. In most Sydney houses the main stop tap sits at the water meter, near the front boundary, often in the front garden or beside the driveway. Turn the handle clockwise until it stops. In apartments, look for an isolation valve in the laundry, kitchen cupboard or a service riser in the hallway; your strata manager or building manager can tell you where it is.
- Turn off the electricity if water is near anything electrical. If water is running near power points, appliances, ceiling lights or the switchboard, switch off the main switch at the switchboard. Only do this if you can reach the switchboard without standing in water. If you can’t, keep everyone out of the area and tell the plumber when you call.
- Turn off the hot water system. Switch off the power to an electric unit, or set a gas unit to “pilot” or off. This protects the heating element and stops the tank from heating with no water flowing through it.
- Drain the pipes. Open the cold taps at the lowest point in the house, such as the laundry tub or an outdoor garden tap, and flush the toilets. This empties the water still sitting in the pipes and takes pressure off the damaged section.
- Contain the water. Put buckets under drips, lay towels along doorways and use a wet-and-dry vacuum on standing water. If a ceiling is bulging with water, don’t stand under it. A small hole made with a screwdriver into a bucket can release the water before the plasterboard collapses, but only attempt this if the power to that area is off.
- Protect your belongings. Move furniture, rugs, electronics and documents out of the wet area. Put foil or plastic under furniture legs that can’t be moved, so timber doesn’t stain the carpet.
- Photograph everything. Take photos and short videos of the burst pipe, the water and all damage before you start cleaning up. Your insurer will ask for them, and so will your landlord or strata manager if you’re renting or in a unit.
Once the water is off and the area is safe, call a licensed plumber. A burst pipe emergency doesn’t get cheaper by waiting. Even with the main stop tap off, wet plasterboard and timber keep absorbing moisture, and mould can start growing within 24 to 48 hours.
Can’t Find or Turn the Main Stop Tap?
Older Sydney homes often have a stop tap that has seized from years of not being used. Don’t force it with a wrench, because the stem can snap and make the leak worse. If you can isolate the burst section using a local valve, such as the small taps under a sink or behind a toilet, use that instead. Otherwise, call us straight away and we’ll talk you through it on the phone while a plumber is on the way. Once the emergency is over, ask your plumber to service or replace a stiff stop tap so it works next time.
How To Do a Temporary Burst Pipe Fix
A temporary burst pipe fix buys you time until a plumber arrives. It is not a repair, and it shouldn’t be left in place for more than a day or two.
- Self-fusing silicone repair tape: Dry the pipe as much as you can, then stretch the tape tightly around the split, overlapping each turn by half and extending a few centimetres past the damage on each side.
- Pipe repair clamp: A rubber-lined clamp from a hardware store, tightened over the split, works well on a straight run of copper or PVC.
- Epoxy plumbing putty: Knead it and press it over a pinhole leak. It needs a dry surface and time to cure, so it’s best for small leaks after the water is off.
If the split is at a joint, a fitting or a flexi hose, tape and putty rarely hold. Leave the water off and wait for the plumber.
Who To Call for a Burst Water Pipe in Sydney
Who you call depends on where the pipe has burst. In Sydney, responsibility for water pipes is split between the property owner and Sydney Water.
Call a licensed plumber when the burst pipe is on your side of the meter. Sydney Water owns the water main in the street and the water meter at your property. As the property owner, you’re responsible for the pipes and fittings between the meter and your house, and everything inside the house. Any burst pipe inside the home, under the house, in the walls or in the garden past the meter is a job for a licensed plumber. In NSW, plumbing work on water supply pipes must be done by a plumber licensed through NSW Fair Trading.
Call Sydney Water on 13 20 90 for a water main burst or a leak at the meter. If water is gushing from the footpath, the street, or the meter itself, it’s likely Sydney Water’s responsibility. Sydney Water’s own guidance says it repairs leaks between its pipes and the meter, up to one metre inside your property boundary, at no charge. Its faults line runs 24/7. Source: Sydney Water, meter maintenance
Not sure which side it’s on? Turn off the tap at your meter. If the water stops flowing, the leak is in your pipes and you need a plumber. If water keeps coming out near the meter or footpath, call Sydney Water.
Renting or living in a strata unit? Tenants should stop the water, then contact their landlord or agent straight away; a burst water service counts as an urgent repair in NSW. In apartment buildings, pipes inside the walls and common areas are usually the owners corporation’s responsibility, so let your strata manager know as well.
CTA box (mid-article): Need an emergency plumber for a burst pipe? Radiant Plumbing answers 24/7 and dispatches straight away across Sydney, from the Northern Beaches to Western Sydney. (02) 8866 1322. Learn more about our 24/7 emergency plumbing service.
Why Water Pipes Burst in Sydney Homes
Frozen pipes are rare in Sydney. Burst pipes in Sydney are usually caused by pressure, age and ground movement instead.
- High water pressure. Mains pressure in parts of Sydney, especially low-lying suburbs, can be well above what household plumbing is designed for. Australian Standard AS/NZS 3500 limits pressure inside a home to 500 kPa at outlets. Without a working pressure limiting valve, joints and fittings are under constant strain.
- Water hammer. That loud bang when a tap or washing machine shuts off is a pressure shock travelling through the pipes. Over time it loosens fittings and fatigues pipe walls.
- Ageing galvanised and copper pipes. Many pre-1980s homes still have galvanised steel pipes, which rust from the inside out. Copper lasts longer but can develop pinhole leaks, particularly with aggressive water or poor earthing.
- Failed flexi hoses. The braided hoses connecting taps and toilets to the wall are one of the most common causes of a sudden pipe burst in Australian homes. Once the braiding rusts or frays, the rubber hose inside can split without warning.
- Ground movement and tree roots. Sydney’s reactive clay soils shrink in dry spells and swell after heavy rain. That movement stresses underground pipes, and roots from large trees can crush or crack them.
- Accidental damage. A nail or screw through a wall during renovations, or a spade through a garden pipe, is enough to cause a burst water pipe.
Signs of a Burst or Broken Water Pipe
Not every burst pipe announces itself with a fountain of water. A broken water pipe inside a wall, under a slab or under the house can leak for days before you notice. Watch for:
- the sound of running water when every tap is off
- a sudden drop in water pressure at taps and showers
- damp patches, bubbling paint or swollen skirting boards
- a musty smell or new mould spots on walls and ceilings
- warm spots on a tiled or concrete floor, which can mean a hot water pipe leaking under the slab
- a water bill that’s much higher than usual (see why is my water bill so high)
- the dial on your water meter still moving when nothing in the house is running
To test for a hidden leak, turn off every tap and water appliance, note the meter reading, and check it again after an hour. If the number has changed, you have a leak somewhere. For more warning signs, read our guide to 10 signs you have a hidden water leak.
Finding the Burst Pipe Location
The burst pipe location isn’t always where the water appears. Water travels along pipes, joists and roof framing, so a stain on the ceiling may be metres away from the actual split. Rather than cutting open walls to search, our plumbers use non-invasive leak detection, including thermal imaging cameras, acoustic listening equipment and pressure testing, to pinpoint the leak. That means one small, neat access hole instead of several large ones.
Where Pipes Burst: Walls, Bathrooms, Under the House and Outside
Inside a wall. A burst pipe inside a wall is hidden until paint bubbles or plasterboard sags. Turn the water off at the main and don’t cut into the wall yourself, because cables often run alongside pipes. Our guide to burst pipe in wall warning signs explains what to look for and how it’s repaired.
In the bathroom. Bathrooms hold more pipes and fittings than any other room, and flexi hoses under vanities and behind toilets fail often. A leak behind tiles can also damage waterproofing. See our burst pipe in bathroom emergency guide for room-specific steps.
Under the house or under the slab. In homes with a subfloor, a burst pipe under the house soaks the ground, raises humidity and can rot bearers and joists. In slab homes, a leaking pipe under the concrete often shows up as a warm floor or cracked tiles. Both need professional leak detection.
In the yard. A broken water pipe between the meter and the house can show up as a soggy patch of lawn, water bubbling through pavers, or a meter that never stops spinning. Tree roots and ground movement are the usual causes.
Burst Water Pipe Repair: How Plumbers Fix It
A proper burst water pipe repair fixes the cause as well as the split. Here’s what a licensed plumber will typically do.
- Find and expose the damage with as little cutting as possible.
- Cut out the damaged section and check the pipe either side. If it’s thin, corroded or brittle, more pipe is replaced.
- Join in new pipe using copper with soldered or press-fit joints, or PEX with crimped fittings, matched to your existing system.
- Pressure test the repair to make sure it holds.
- Check the cause, such as mains pressure, a faulty pressure limiting valve or water hammer, and fix it so the pipe doesn’t burst again.
Where a burst pipe is one of several leaks in old galvanised or copper pipework, repiping part or all of the home is often better value than repeated repairs. For damaged underground pipes, trenchless options can avoid digging up the garden; our pipe relining cost guide explains when that applies.
A burst flexi hose is always replaced, never patched. We fit quality braided hoses with a clear service life, so you know when to replace them.
How Much Does Burst Pipe Repair Cost in Sydney?
Burst pipe repair cost in Sydney depends on three things: how easy the pipe is to reach, the time of day, and whether other pipes are also failing. As a rough guide:
| Job | Indicative cost (AUD) |
| Replace a burst flexi hose | 150–300 |
| Repair an exposed, easy-to-reach pipe | 250–600 |
| Repair a pipe inside a wall or ceiling, plus access hole | 500–1,500 |
| Locate and repair a pipe under a slab or underground | 1,000–3,500+ |
| After-hours surcharge | Varies; ask before work starts |
These ranges cover the plumbing only. Plastering, painting, flooring and drying are extra and are often claimed through home insurance. Radiant Plumbing has a $0 call-out fee and gives a fixed, upfront quote before any work begins. For a closer look at rates, see our emergency plumber cost Sydney guide and leak detection cost guide.
Is a Burst Pipe Covered by Home Insurance?
Most Australian home and contents policies cover damage caused by a sudden burst pipe, usually listed in the Product Disclosure Statement (PDS) under “escape of liquid”. That typically includes damaged flooring, walls, ceilings and belongings.
Two things often surprise people. First, many policies cover the damage the water caused but not the cost of repairing the pipe itself, or only the cost of accessing it. Second, damage from a slow leak that went on for weeks or months is usually excluded as wear and tear.
To give your claim the best chance:
- photograph the burst pipe and damage before cleaning up
- keep the damaged section of pipe if the plumber removes it
- ask your plumber for a written report on the cause and the repair
- keep every invoice and receipt
- call your insurer as soon as the water is under control
We provide detailed reports and photos for insurance claims as part of every emergency job.
How To Prevent Burst Pipes
Most burst pipes give warning signs before they fail. A little maintenance avoids most emergencies.
- Know where your main stop tap is, and turn it off and on once a year so it doesn’t seize.
- Check your water pressure. Have a plumber test it, and fit or replace a pressure limiting valve if it’s above 500 kPa.
- Replace flexi hoses every 5 to 10 years, or sooner if you see rust, fraying or bulging.
- Fix water hammer with a water hammer arrestor rather than living with the bang.
- Plan ahead for old pipes. If your home still has galvanised pipes, budget for replacement before they fail.
- Keep large trees away from service lines, and get roots checked if a big tree is near your water pipe.
- Book a regular inspection. A home plumbing inspection catches corrosion, weak joints and slow leaks while they’re still cheap to fix.
Burst Pipe FAQs
What is the first thing to do when a pipe bursts? Turn off the water at the main stop tap, usually at the water meter near your front boundary. Then turn off the power if water is near anything electrical.
Who do I call for a burst water pipe in Sydney? Call a licensed plumber for pipes on your side of the meter, including everything inside the house. Call Sydney Water on 13 20 90 for a water main burst in the street or a leak at the meter.
Can I fix a burst pipe myself? You can make a temporary burst pipe fix with repair tape or a clamp. A permanent repair to water supply pipes in NSW must be done by a licensed plumber.
How long does burst pipe repair take? An easy-to-reach pipe usually takes one to two hours. Pipes in walls, under slabs or underground can take half a day or more, plus time for drying and making good.
Does insurance cover burst pipes in Australia? Most policies cover sudden water damage from a burst pipe under “escape of liquid”, but many don’t pay to fix the pipe itself. Check your PDS.
How quickly does mould grow after a burst pipe? Mould can start within 24 to 48 hours on wet plasterboard, carpet and timber, which is why fast drying matters.
24/7 Burst Pipe Repair in Sydney
A burst water pipe is stressful, but you now know the steps: turn off the water, make the area safe, drain the pipes, document the damage, and call the right people. The faster a licensed plumber is on site, the less water damage you’ll be dealing with.
Radiant Plumbing provides 24/7 burst pipe repair across Sydney, including the CBD, Eastern Suburbs, Inner West, North Shore, Northern Beaches, Hills District, Western Sydney and the St George area. Our plumbers are fully licensed and insured, we charge $0 call-out, and you’ll get a fixed upfront price before we start.
