How can I tell what type of pipe an older Perth house has without opening the walls?

You often can't tell for certain just by looking, but a building inspector or plumber can check exposed pipework, like under sinks or in the roof space, for clues about age and material, and ask about any known history of pipe replacement.

Should I get a separate plumbing inspection, or is a building inspection enough?

A standard building and pest inspection covers general condition but isn't always a deep plumbing assessment. For an older home, or if anything looks concerning, a specific plumbing check, including drain camera inspection, can be worth the extra cost for peace of mind.

Is galvanised pipe in an older Perth home a dealbreaker?

Not necessarily a dealbreaker, but it's a genuine factor to weigh, since galvanised pipe corrodes internally over time and often needs replacement eventually. Factor the likely cost and timing of that replacement into your overall assessment of the property.

What plumbing questions should I ask the seller or agent directly?

Ask about the age of the hot water system, whether any pipe replacement or re-plumbing has been done, whether there's a history of blocked drains or leaks, and whether any gas work has current compliance certification.

A first-home buyer's plumbing checklist for older Perth houses

By Julian Fischer · Updated 2026-08-27

Buying your first home is exciting enough without a plumbing surprise turning up six months in. Older Perth homes, particularly those built before the 1990s, can carry plumbing quirks that aren’t always obvious during a standard walk-through, so it’s worth knowing what to look for and ask about before you commit.

What to check before you buy

Pipe material and age. Homes built before the 1990s in Perth sometimes still have original galvanised steel or older copper pipework, which corrodes and degrades over time. Ask the agent or seller whether any re-plumbing has been done, and when.
Hot water system age. A hot water system nearing the end of its typical service life is a cost you can reasonably anticipate. Check the manufacture date on the unit’s data plate if you can access it during an inspection.
Drainage history. Ask whether the property has a history of blocked drains, particularly recurring ones, which can indicate tree root intrusion into older clay pipe or a deeper issue worth investigating further.
Gas compliance. If the property has gas appliances, ask whether compliance certificates exist for any past gas fitting work.
Water pressure and general condition. Low water pressure during a walk-through can hint at scale buildup, an aging system, or supply issues worth asking about.

Getting a proper look before you commit

A standard building and pest inspection gives you a general sense of the property’s condition, but it isn’t always a deep plumbing assessment. For an older home, or anywhere you’ve noticed a concerning sign, a separate plumbing check, potentially including a CCTV drain inspection, can uncover issues that a general inspection wouldn’t catch. This costs more upfront but can save a lot more if it flags something significant before you’re locked into a contract.

A plumber inspecting exposed pipework in the roof space of an older Perth home during a pre-purchase check, daylight, no text overlays

Questions worth asking directly

Don’t rely only on what’s visible during an open home. Ask the agent or seller directly about the age of the hot water system, whether re-plumbing has occurred, any history of leaks or blocked drains, and gas compliance status. A seller with nothing to hide will usually have this information readily, or will find out for you.

Check	Why it matters	Where to look
Pipe material	Older materials corrode and eventually need replacement	Ask seller, check exposed pipework
Hot water system age	Predicts likely replacement timing	Data plate on the unit
Drainage history	Recurring blockages suggest a deeper issue	Ask seller, consider a CCTV check
Gas compliance	Needed for safe, legal appliance use	Ask for certificates

Using findings in your negotiation

If a plumbing check turns up a genuine issue, whether that’s ageing pipework, a tired hot water system, or a drainage problem, you generally have a few options: ask the seller to fix it before settlement, negotiate a price reduction to cover the likely cost, or proceed as is with the cost factored into your own budget. Which approach makes sense depends on the size of the issue and how competitive the property market is at the time, so it’s worth discussing with your buyer’s agent or conveyancer rather than deciding in isolation. Either way, having a written estimate in hand, rather than a vague sense that something needs fixing, makes any negotiation far more concrete.

Budgeting for what you find

None of this means avoiding older Perth homes, since plenty are perfectly sound, but knowing what you’re taking on lets you budget realistically rather than being caught out. If a pre-purchase check flags ageing pipework or a tired hot water system, get a written estimate for the likely replacement cost so you can factor it into your offer or your first-year budget. If the hot water system is the issue, check whether a rebate or payment plan changes that calculation; our guide on hot water rebates and payment plans covers what’s currently available in WA.

If you’re on the other side of a settlement, our companion guide on plumbing checks before selling a house covers the seller’s side of the same questions.

To find a Perth plumber for a pre-purchase check, our directory of local plumbers is ranked using our published scoring methodology, based on rating, review volume, recency and sentiment.

Frequently asked questions

How can I tell what type of pipe an older Perth house has without opening the walls?: You often can't tell for certain just by looking, but a building inspector or plumber can check exposed pipework, like under sinks or in the roof space, for clues about age and material, and ask about any known history of pipe replacement.
Should I get a separate plumbing inspection, or is a building inspection enough?: A standard building and pest inspection covers general condition but isn't always a deep plumbing assessment. For an older home, or if anything looks concerning, a specific plumbing check, including drain camera inspection, can be worth the extra cost for peace of mind.
Is galvanised pipe in an older Perth home a dealbreaker?: Not necessarily a dealbreaker, but it's a genuine factor to weigh, since galvanised pipe corrodes internally over time and often needs replacement eventually. Factor the likely cost and timing of that replacement into your overall assessment of the property.
What plumbing questions should I ask the seller or agent directly?: Ask about the age of the hot water system, whether any pipe replacement or re-plumbing has been done, whether there's a history of blocked drains or leaks, and whether any gas work has current compliance certification.