Burst Pipe Repair: What to Do When a Pipe Bursts
June 06, 2026 by Mr Handy Team
If you have a burst pipe, turn off your main water supply immediately to stop the flow and reduce further water damage. Then stay away from electrical hazards, drain remaining water from the pipes and arrange professional burst pipe repair tradesperson through Mr Handy.
This guide explains exactly what to do when a pipe bursts, how to minimise water damage, how to identify a burst pipes inside a wall or house, temporary repair options, repair costs and when you need a plumber.
Important: If water is near power points, electrical appliances, light fittings or your switchboard, do not enter the affected area unless it is safe to do so.
Why Do Pipes Burst?
Before diving into burst pipe repair, it helps to understand what causes pipes to burst in the first place. Common causes include:
- Freezing temperatures – Water expands as it freezes, building pressure inside the pipe until it cracks or splits.
- Corrosion – Older metal pipes degrade over time, thinning walls until they can no longer hold pressure.
- High water pressure – Pressure above 80 psi can stress pipe joints and fittings over time.
- Tree root intrusion – Roots can infiltrate underground pipes, cracking them as they grow.
- Physical damage – Accidental damage from drilling, digging, or renovation work.
- Old or failing joints – Connections between pipes weaken with age and can eventually give way.
Knowing the cause matters because it affects your burst pipe repair approach and what a plumber will recommend long-term.
When a Pipe Bursts: To Do in First 10 Minutes
Sometimes a burst pipe isn't immediately obvious - especially if it's inside a wall or under the floor. Watch for these warning signs:
- Sudden drop in water pressure
- Discoloured or rusty water from taps
- Unexplained wet patches on walls, ceilings, or floors
- Mould or damp smell developing quickly
- A significantly higher than usual water bill
- The sound of running water when no taps are on
Follow these steps:
Step 1: Shut Off the Water Supply Immediately
Find your property's main water shut-off valve and turn it off
In many Australian homes, the main shut-off valve will be located near the water meter at the front boundary of the property. Depending on the property, you may also have local isolation valves under the kitchen sink, or in a utility cupboard. Turn it clockwise (off) to cut the water supply to your entire home.
If you cannot find or operate the main valve, contact your water provider or a plumber for assistance.
The faster the water is isolated, the less water can enter your walls, flooring and belongings.
Step 2: Turn Off Your Hot Water System
Running a hot water unit without a water supply can cause serious damage. Switch off the circuit breaker for electric systems, or follow the manufacturer's instructions (or call your gas provider) for gas systems.
Step 3: Open Taps to Release Remaining Pressure
Once the main water supply is turned off, open cold-water taps to allow remaining water to drain from the pipework.
You can also flush toilets where appropriate.
This helps remove residual water and pressure from the plumbing system while you wait for the repair.
Step 4: Locate the Burst Pipe
- Visible cracks or splits in exposed pipes
- Water stains, bubbling paint, or warped skirting boards along walls
- Wet or soft patches on ceilings (indicating a leak above)
- Water pooling under floors or in crawl spaces
If the pipe is behind a wall or under a concrete slab, you may not be able to locate it visually - this is where a licensed plumber with leak detection equipment becomes essential.
Step 5: Document the Damage for Insurance
Before cleaning up, take photos and videos of all visible damage - wet walls, flooring, ceilings, furniture, and belongings. This documentation is critical for any home insurance claim. Note the time you discovered the burst and what steps you took.
Insurers generally want this evidence before they'll assess a claim.
Step 6: Call an Emergency Plumber for Burst Pipe Repairs
This is the step that actually resolves the problem. Temporary fixes can hold things together for a few hours, but proper burst pipe repair needs a licensed plumber. Pressurized water lines that are patched rather than properly repaired tend to fail again, and DIY work on them can affect your home insurance cover. Mr Handy's licensed plumbers are available for emergency call-outs to get the water back on and the damage contained.
A licensed plumber will:
- Accurately locate the burst using specialised equipment
- Cut out and replace the damaged section of pipe
- Test the repair under full pressure
- Inspect surrounding pipes for any additional weaknesses
- Advise on prevention to avoid future bursts
Repairing Burst Pipes: What a Licensed Plumber Actually Does
Repairing burst water pipe damage properly is more than patching the visible crack. A plumber will typically::
- Confirm the exact location using pressure testing or acoustic detection
- Cut out and replace the damaged section with new pipe, matched to the existing material where possible
- Pressure-test the repair before closing up any wall or floor cavity
- Check adjoining joints and fittings for early signs of the same failure
- Advise on whether the underlying cause (pressure, age, freezing exposure) needs addressing separately
This is also why repairing burst pipes is rarely a same-price-every-time job - the scope depends on what the plumber finds once the wall or floor is opened up
What NOT to Do When a Pipe Bursts
Knowing what not to do can prevent additional damage
- Don't turn the water back on to test the pipe
- Don't touch wet electrical equipment
- Don't rely on tape as a permanent repair
- Don't cut into walls unnecessarily
- Don't ignore a small leak
Temporary Burst Pipe Repair Options (While You Wait)
If a plumber can't arrive for several hours, these temporary measures can reduce further damage:
Pipe Repair Tape (Silicone or Fibreglass)
- Wrap tightly around the cracked section. Works best on small cracks in accessible pipes and is suitable for temporary use only.Pipe Repair Clamp
- A rubber gasket clamp that fits over the cracked area and is tightened with bolts. More effective than tape for larger splits, but still a temporary measure.Epoxy Putty
- Can be moulded around a crack for a short-term seal. Not suitable for high-pressure applications or large breaks.
Why Do Pipes Burst
Understanding why pipes fail can help you prevent another emergency burst water pipe
- Freezing temperatures - Water expands as it freezes, building pressure inside the pipe until it cracks or splits.
- Corrosion - Older metal pipes degrade over time, thinning walls until they can no longer hold pressure.
- High water pressure - Pressure above 80 psi can stress pipe joints and fittings over time.
- High water pressure - Roots can infiltrate underground pipes, cracking them as they grow.
- Physical damage - Accidental damage from drilling, digging, or renovation work.
- Old or failing joints - Connections between pipes weaken with age and can eventually give way.
How Much Does It Cost to Fix Burst Pipe?
The cost of burst pipe repairdepends on the circumstances of the job rather than one fixed price.
- Location of the pipe - Accessible pipes are cheaper to fix than those inside walls, under slabs, or in crawl spaces.
- Extent of the damage - A simple section replacement differs significantly from widespread pipe failure.
- Pipe material - Copper, PVC, PEX, and galvanised steel all have different repair methods and costs.
- After-hours or emergency call-out fees - Emergency plumbing visits typically carry a premium.
- Water damage remediation - If walls, flooring, or insulation are saturated, you may also need a water damage restoration company.
Simple vs Complex repairs
A small, accessible pipe failure may be relatively straightforward. If a pipe burst in a wall, under a slab or in another difficult-to-access location can require additional investigation and repair work.
As a general guide, straightforward burst pipe repairs range from a few hundred to several thousand dollars depending on complexity. Always get an AI Smart Budgetting quote from Mr Handy.
How to Prevent Burst Pipes
The best burst pipe repair is the one you never need. Take these preventive steps:
- Insulate pipes in cold or exposed areas such as under the house, in the roof cavity, or in unheated garages.
- Know your water pressure install a pressure reducing valve if pressure exceeds 80 psi.
- Replace ageing pipes proactively if your home has galvanised steel pipes over 40 years old, consider a full repipe assessment.
- Schedule annual plumbing inspections to catch corrosion, joint weakness, and early signs of pipe deterioration.
- Avoid pouring fats or harsh chemicals down drains, which can corrode pipe interiors over time.
- Locate your main shut-off valve and make sure everyone in your household knows where it is.
Burst Pipe vs Leaking Pipe: What's the Difference?
A leaking pipe may release a small or intermittent amount of water.
A burst pipe generally involves a significant failure that can release water much more quickly.
However, a small leak can become a larger plumbing failure, so you shouldn't wait for water to start flooding your home before taking action.
When to Call an Emergency Plumber vs. Book a Standard Visit
| Situation | Action |
|---|---|
| Water actively gushing from a pipe | Call an emergency plumber now |
| A wet patch spreading on the ceiling | Call an emergency plumber now |
| A water stain with no active leak | Book a standard visit |
| Pressure drop with nothing visibly wrong | Book a standard visit |
| A minor, steady drip from a joint | Book a standard visit |
