Two days before an auction in Fairfield, I walked through a 1968 brick house with a young couple who'd already paid for a building and pest report. The report called the bathroom "serviceable". It didn't mention the earthenware sewer with roots in every joint, the nineteen-year-old hot water tank, or the laundry plumbed into the stormwater. A pre-purchase plumbing inspection found all three in ninety minutes. They still bought the house, for less. Across South West Sydney the plumbing is where the expensive post-settlement surprises live, so here's what a plumbing inspection before buying a house covers, what it costs, and when it's worth it. We run a CCTV drain inspection, no call-out fee, across Liverpool, Camden and Campbelltown.
A pre-purchase plumbing inspection is a licensed plumber going over the water supply, drainage, hot water, gas and wet areas before you sign, usually with a CCTV camera through the sewer. It finds the expensive problems a building and pest report doesn't cover. It's priced as a fixed fee per property, agreed before I turn up.
What a building and pest report doesn't tell you about the plumbing
A building inspector looks at what's visible, and they're good at it: cracks, damp, termites, roof. But most plumbing is behind tiles, under the slab or a metre underground, and the standard report carries a line saying plumbing wasn't tested. That's not a dig at inspectors. It isn't their trade and they don't carry a drain camera. So the things that cost real money after settlement, a collapsed sewer, a rusted-through water service, a hot water system on its last legs, sail straight through.
A plumbing inspection is a licensed plumber doing what a licensed plumber does, with the tools of the trade, and writing it down with photos so you can negotiate or walk away. Camera footage of a cracked sewer is the sort of evidence an agent can't talk around.
The plumbing inspection checklist: what I actually look at
Every property is different, but this is the list I work through on a typical house.
- Water supply. Meter leak test with everything off, pressure at a tap, the material and condition of the service into the house, whether the stop tap works, any galvanised pipe still in use.
- Sewer drainage. CCTV camera from the inspection opening to the boundary, looking for roots, cracks, bellies, displaced joints and old repairs. Where the boundary trap and overflow gully are.
- Stormwater. Where the downpipes actually go, whether the line reaches the kerb or a legal point, and whether there's a detention tank or an absorption pit.
- Hot water. Age from the compliance plate, type, tank corrosion, relief valve, tempering valve present and working.
- Wet areas. Toilets for leaks and flush, taps and mixers, signs of failed waterproofing at showers, flexi hoses, dishwasher and washing machine connections.
- Gas. Visible gas pipework and appliance connections, and a pressure test on the installation if you want one.
- Paperwork. The sewer service diagram attached to the contract, and whether what's in the ground matches it.
Old house plumbing problems: Liverpool, Fairfield and Cabramatta
Most of the housing between Liverpool and Fairfield went up between the 1950s and the 1980s, and plumbing of that era fails in predictable ways. The sewer is usually earthenware, laid in short lengths with cement joints, and every joint is an open invitation to tree roots. That's why a camera matters more here than anywhere: a root-choked earthenware line can look fine from the gully and be one flush from blocking. I've explained the fixes in my guide to tree roots in sewer pipes, and relining versus digging is a conversation to have before you buy, not after.
The water service is often original galvanised steel, rusting from the inside until the kitchen tap runs at a trickle. Hot water systems in these houses are frequently past fifteen years with no tempering valve on the bathroom line, and a hot water system replacement is a common first job for new owners. Then there's the DIY: laundries plumbed into stormwater, extensions with drainage that never saw an inspector, gas bayonets fitted by a mate. None of it is a reason not to buy a solid brick house in Cabramatta. It's a reason to know the number before the auction.
New homes in Macarthur: different risks, not no risks
A buyer in Oran Park assumes a five-year-old house has five-year-old plumbing problems, which is to say none. Mostly true. What I find instead is rushed work: stormwater pits with no outlet, downpipes that stop at the surface, drains laid with a belly that holds water, flexi hoses already blistering, and a rainwater tank that was plumbed to the toilets for the certifier and hasn't worked since. On-site detention tanks are the sleeper. Half the owners I meet in Leppington don't know there's one under the driveway, let alone that it needs cleaning.
The good news is that the builder's statutory warranties under the NSW Home Building Act pass to you when you buy. Major defects are covered for six years from completion and everything else for two, and the Building Commission NSW defects page sets out how a claim works. A written inspection report with photos, dated before settlement, is exactly what you'll want if it comes to that.
CCTV drain inspection before buying: the one test I wouldn't skip
If the budget only stretches to one thing, put the camera down the sewer. A sewer replacement is the most expensive job a house can throw at you, and it's invisible until it isn't. I run the camera from the nearest inspection opening or the gully, record the footage, and mark the depth and position of anything I don't like with the locator so a quote can be put on it. I usually run the stormwater too, because a line that's collapsed under the driveway is why the front lawn floods every February. It's the same camera I use for blocked drains, and what it shows is covered in my CCTV drain camera inspection guide.
One honest caveat: I can't inspect what I can't reach. If the seller has concreted over the inspection opening or the yard is locked, I'll tell you what I couldn't see rather than guess.
Plumbing inspection cost, and what the findings cost to fix
I price a pre-purchase inspection as a fixed fee per property, agreed before I turn up. It moves with the size of the block, how many wet areas there are and whether you want both the sewer and the stormwater on camera. As a yardstick, Sydney 2026 price guides put a plumber's hourly rate at $92 to $230, most around $140, and an inspection with the camera is a couple of hours of that plus the report. Against the price of a house it's a rounding error, and it's often paid back several times over in the negotiation. The more useful numbers are what the findings cost to put right, because that's your bargaining position.
| Finding | Typical cost to fix (Sydney 2026 price guides) |
|---|---|
| Dripping tap or worn mixer | $92 to $300 |
| Blocked drain that clears with the jet blaster | $180 to $450 |
| Leaking or burst water pipe, accessible section | $230 to $920 |
| Electric storage hot water system, supplied and installed | $920 to $2,875 |
| Gas storage hot water system, supplied and installed | $1,375 to $4,025 |
| Sewer relining, sewer or water service replacement, stormwater rebuild | Quoted on inspection: length, depth, access and whether I can bore instead of dig |
When to call a plumber
Book the inspection as soon as you're serious about a property and before you exchange. There's no cooling-off period when you buy at auction, so the camera has to go down before the hammer falls. For a private treaty sale, get it done before you make the offer or inside the cooling-off period. If you've already bought, the same inspection still makes sense in the first few weeks: it gives you a baseline, and on a newer house it starts the process of getting defects to the builder while the warranty is running. Done right. Done once.
Monarch Civil & Plumbing covers South West Sydney and the Macarthur region from Austral, and pre-purchase inspections are a regular part of my week from Fairfield out to Camden. I bring the CCTV camera, the locator and thirteen years of knowing what these houses do, and you get a plain report with photos and prices, not a sales pitch. See what else we do across our plumbing services, and if you need a plumber in Fairfield, Oran Park or a South West Sydney plumber you can trust with a house you haven't bought yet, call 0455 222 292.
Related guides: CCTV drain inspection and tree roots in sewer pipes.
Need it sorted? Ring 0455 222 292 any hour or book online. Monarch Civil & Plumbing offers a CCTV drain inspection, no call-out fee: the fault on screen, marked on the ground, and a written quote the same day.
Getting a plumber in South West Sydney?
How we work explains the no-call-out-fee promise and how a quote works. The suburb pages for plumber Liverpool, plumber Fairfield, plumber Campbelltown and plumber Camden say what we see locally, and service areas lists every suburb within about 20 km of Austral, plus Wollongong and the Illawarra regularly.
Frequently asked
What does a pre-purchase plumbing inspection include?
A licensed plumber checks the water supply, sewer and stormwater drainage, hot water system, wet areas and visible gas work, usually with a CCTV camera through the sewer to look for roots, cracks and collapsed sections. You get a written report with photos, the camera footage and a price on anything that needs fixing, so you can negotiate before exchange or walk away. It covers what a building and pest report leaves out.
How much does a plumbing inspection cost before buying a house?
I quote it as a fixed fee per property before I turn up, and it moves with the size of the block, the number of wet areas and whether you want the sewer and the stormwater both on camera. Sydney 2026 price guides put a plumber's hourly rate at $92 to $230, most around $140, and an inspection is a couple of hours of that plus the camera and the report. It's small next to the cost of a sewer replacement.
Does a building and pest inspection cover plumbing?
Not in any real way. A building inspector reports on what's visible and will note a dripping tap or damp under a shower, but most reports state that plumbing wasn't tested, and inspectors don't carry a drain camera. Sewer condition, the water service, the age and state of the hot water system and where the stormwater actually goes are all outside a standard building and pest report. A plumbing inspection fills that gap.
Is a CCTV drain inspection before buying really necessary?
If you only do one thing, do this. A sewer replacement is the most expensive plumbing job a house can throw at you and it's invisible from above ground. The camera shows roots, cracks, bellies and old repairs, and the locator marks the depth and position of a fault so a quote can be put on it. On older homes with earthenware pipes it's essential; on new builds it catches drains laid badly or damaged during construction.
What plumbing problems are common in older homes in Liverpool and Fairfield?
Earthenware sewer pipes with tree roots in the joints, galvanised steel water services rusting from the inside and cutting pressure, hot water systems well past their lifespan, no tempering valve on the bathroom hot water, and unlicensed work such as laundries plumbed into stormwater or extensions with drainage that was never inspected. None of these are deal breakers, but each one has a cost that should be part of the price you pay.
Are new homes in Macarthur covered by a builder's warranty for plumbing defects?
Yes. Under the NSW Home Building Act the builder's statutory warranties pass to later owners. Major defects are covered for six years from completion of the work and other defects for two years. A pre-purchase inspection report with dated photos gives you evidence of the defect and when it was found, which is what you need to raise it with the builder or take it further through Building Commission NSW.
Licensed plumber and drainer based in Austral, 13+ years in the trade, working across Liverpool, Fairfield and the Macarthur region. About Paul