Spot the Warning Signs Early and Skip the 2 am Burst Pipe
Some of the best homes in Australia are the older ones on quiet, established streets. Think a post-war brick bungalow in Perth or a Queenslander up on stumps in Brisbane. They’re built solid, and they’ve got character to spare. The plumbing, though, went in decades ago to the standards of the day, and a lot of it is still there.
You don’t see most of it. It sits in the walls and under the house, so it’s easy to forget about until a pipe bursts or the toilet backs up. This guide walks through the most common old house plumbing issues, what the early signs look like, and when it’s worth getting a licensed plumber out.
TL;DR
What Makes Older Home Plumbing Different?
Older homes were plumbed with whatever was standard at the time, and those materials were never meant to last forever. If your place went up before the 1980s, some of the original pipework is probably still doing the job.
In most older Australian homes, the water pipes are either galvanised steel (steel with a zinc coating to slow down rust) or copper. Copper tends to hold up well, but the joints and fittings on older installations weaken with age. The sewer line out to the street is usually clay or earthenware, which means short lengths of terracotta pipe joined end to end and buried in the yard.
Plenty of homes from the post-war building boom in Perth, Brisbane, Melbourne and Newcastle are still running on those original pipes, and many of them are past their working life.
The trouble is that the damage happens where you can’t see it. Pipes corrode from the inside, and the worst of it is usually under the house or behind the plaster. When a leak or blockage finally shows up, it’s often been brewing for years.
What Are the Most Common Plumbing Problems in Older Homes?
Six problems turn up again and again in older Australian homes: corroded galvanised pipes, low water pressure, tree roots in the sewer, hidden leaks, worn-out fixtures, and corrosion where mismatched pipes meet.
1. Corroded or Failing Galvanised Pipes
Galvanised steel was the go-to for water pipes from the 1940s through to the 1980s. Over the decades, the zinc coating wears away on the inside and rust starts to build up. That slowly narrows the pipe until, eventually, it springs a leak or bursts.
The early signs are low water pressure throughout the house, water that runs rusty or brown, and brown staining around taps and shower heads. If you’re seeing any of that, get a plumber to confirm what your pipes are made of and how far the corrosion has spread. It’s a lot easier to deal with now than after a burst.
2. Low Water Pressure
Low water pressure in an old home is often a symptom of galvanised pipe corrosion. It can also come from a leak somewhere in the system, dodgy DIY work by a previous owner, or pipes that are just too small for modern use. A house plumbed in the 1960s was never designed for a dishwasher, a washing machine and two showers going at once.
The giveaway is weak flow at several fixtures. If it’s only one tap, the problem is more likely a blocked aerator or a worn cartridge in that tap. Walk around the house and test a few. If everything is sluggish, the pipes need a look.
3. Tree Root Invasion in Sewer Lines
Clay and earthenware sewer pipes get brittle as they age, and the joints between sections can crack or shift. Roots are always chasing moisture, so they find those gaps and grow inside. Over time, they cause blockages that won’t stay cleared, and in bad cases they can collapse the pipe. It happens a lot in established suburbs with big gums and figs out the back, whether you’re on the Sunshine Coast or in Canberra.
Watch for drains that block again soon after being cleared, gurgling from the toilet, and slow drains in more than one room. Recurring blocked drains in an older property usually mean trouble underground, so book a camera inspection to see what’s going on. Our blocked drains team can clear the roots and tell you whether the pipe needs repair.
4. Hidden Leaks Behind Walls and Under Floors
Joints and fittings in older pipework loosen and corrode over time. Because the pipes are hidden, a slow leak can run for months, sometimes years, before anyone notices.
Signs include a water bill that keeps creeping up, damp or soft patches on walls, a musty smell, and mould that comes back however often you clean it. Resist the urge to start pulling off plaster. Professional leak detection can find the source without wrecking the room.
5. Outdated or Substandard Fixtures and Fittings
Taps, toilets and showerheads from 40-plus years ago weren’t designed with water efficiency in mind, and their internal parts wear out. Some older installations may not meet current Australian plumbing standards either.
You’ll notice taps that drip however hard you turn them off, a toilet cistern that never stops running, or a shower that can’t hold a steady flow. Replace fixtures as they fail, or do the lot if you’re renovating anyway. Check the hot water system while you’re at it. If only the hot tap runs rusty, the tank may be the problem rather than the pipes, and our hot water system team can check it over.
6. Mixed Pipe Materials from Past Repairs
Most older homes have been patched up a few times over the years, often by different plumbers. You can end up with galvanised steel, copper and PVC all in the one system. Where two different metals are joined without the right fitting, a chemical reaction speeds up corrosion at the join.
Look for leaks at particular joints, staining around specific fittings, and pressure drops you can’t explain. A plumber can fit the correct connectors at each join. If there are a lot of them, replacing that run of pipe is often the simpler fix.
How Do I Know If My Home Has Galvanised Pipes?
The quickest way to tell is to find an exposed pipe and look at it. Try under the kitchen or bathroom sink, in the laundry, beside the hot water system, or up in the roof space.
The magnet test is the easiest giveaway. If it grabs on, you’re almost certainly looking at galvanised steel.
Bear in mind that the pipes you can see might not match the ones in the walls or under the slab, especially if the house has had partial repairs over the years. If you’re not sure, a licensed plumber can identify your pipe materials during an inspection.
When Should I Call a Plumber for an Older Home?
Call a plumber as soon as a problem shows up at more than one fixture, or you spot water where it shouldn’t be. In an older home, these are rarely one-offs, and they usually point to something bigger in the pipework.
Book a licensed plumber if you notice any of these:
Even if nothing seems wrong, we recommend a plumbing inspection for any home built before 1985. You’ll find out what you’re working with and can plan upgrades when it suits you, rather than in the middle of an emergency.
Is It Better to Repair or Repipe an Older Home?
It depends on how widespread the problem is. If the fault is isolated, like one leaking joint or a single cracked section of sewer pipe, a targeted repair is usually the sensible fix.
If corrosion is showing up all through the house, fixing one leak at a time usually costs more in the end. Full pipe replacement, or a staged repipe done room by room, tends to be the better investment, and you’re no longer waiting for the next pipe to go.
A CCTV drain inspection is the best way to make the call. The plumber feeds a small waterproof camera through your pipes so you can see exactly what’s in there, whether that’s cracks, roots or corrosion, without anyone having to guess or start digging. Our team can run the inspection, go through the footage with you and give you a straight answer on whether to repair or replace.
Book an Older Home Plumbing Inspection with Plumbing Bros
If your home is more than 30 or 40 years old, or you’ve noticed any of the warning signs above, it’s worth getting it checked before something gives way.
Plumbing Bros has licensed plumbers across Australia, from Perth and Mandurah through to Brisbane, Newcastle, Melbourne and Canberra. Quotes are free, there’s no call-out fee, and our workmanship carries a lifetime warranty. If something does go wrong after hours, we’re on call 24/7 for emergencies.
Book a plumbing inspection online or call 1300 414 234.
Curious what a repipe might cost? We’re putting together a guide to plumbing prices in Australia, so keep an eye on the blog.
Frequently Asked Questions
What are the most common plumbing problems in older Australian homes?
The most common problems are corroded galvanised steel pipes, low water pressure, tree roots in clay sewer lines, hidden leaks behind walls and under floors, worn-out fixtures, and corrosion where different pipe materials have been joined. Most stem from original pipework installed before the 1980s.
How do I know if my home has galvanised steel pipes?
Find an exposed pipe under a sink, in the laundry or in the roof space. Galvanised steel is dull grey, has screw-thread joins, and a magnet will stick to it. Copper is reddish-brown, and PVC is white or cream plastic. A licensed plumber can confirm during an inspection.
Is low water pressure a sign of pipe corrosion?
It can be. In older homes, low pressure across several taps is often caused by rust building up inside galvanised pipes and narrowing the flow. It can also signal a leak or undersized pipes. If only one tap is affected, the issue is more likely the tap itself.
Can tree roots damage my sewer pipes?
Yes. Roots are drawn to moisture and can grow into cracks or loose joints in old clay sewer pipes. Once inside, they cause recurring blockages and can eventually break or collapse the pipe. A CCTV drain inspection will show whether roots are the cause.
When should I repipe an older home rather than repair it?
Repiping makes more sense when corrosion or leaks are showing up throughout the house rather than in one spot. If you’re calling a plumber for a new leak every few months, a full or staged repipe is usually cheaper in the long run. A plumber can assess the condition of your pipes and advise.
How much does it cost to repipe an old house in Australia?
It depends on the size of the home, how easy the pipes are to access, the materials used, and whether you replace everything at once or in stages. The best way to get an accurate figure is a free on-site quote. We’ll also cover typical costs in our upcoming plumbing pricing guide.
Do I need a plumbing inspection before buying an old home?
Yes, it’s worth doing. A standard building inspection usually doesn’t include a camera inspection of the drains or a close look at the pipework. A pre-purchase plumbing inspection can flag corroded pipes, root damage or leaks, so you know what you’re buying and can factor repairs into your offer.
