Buying a home? Know what the plumbing is hiding first.

Buying a house is one of the biggest purchases most of us ever make. In Canberra it almost always comes with a building and pest inspection as a matter of course. The plumbing, though, tends to get waved through. That is a shame, because the plumbing is where some of the more expensive surprises hide, and most of them are invisible on a quick walk through with the agent.

We get called out to plenty of homes in the first few months after settlement, once a new owner discovers a problem that was quietly there the whole time. So here is an honest run through of what a pre-purchase plumbing inspection is, what it actually checks, and whether it is worth doing.

What is a pre-purchase plumbing inspection?

It is a check of a property's plumbing, drainage and gas, carried out by a licensed plumber before you buy, so you know the real condition of what you are taking on. Think of it as the plumbing equivalent of the building and pest report. The plumber looks specifically at the wet parts of the house and tests a few things that a general inspection will not.

Does a building inspection already cover the plumbing?

Not to the same depth. A building inspector does a visual assessment and will note the obvious, like a dripping tap or a water stain on a ceiling. What they generally do not do is run a camera down the drains, pressure test the system, or properly assess how much life is left in the hot water unit. Those are exactly the checks that catch the costly problems, and they are the reason a separate plumbing look can be worth it.

Why it matters in Canberra specifically

A few things about Canberra homes make the plumbing worth a closer look:

• Houses in the older parts of the inner north and inner south can still have ageing galvanised steel or earthenware pipe that corrodes and cracks with age.
• The mature street trees and reactive clay soils here work against old drains. Roots find their way into clay sewer pipe, and ground movement cracks it or pulls the joints apart.
• Frosts and cold snaps put extra stress on outdoor taps, exposed pipework and older fittings.

What does a plumbing inspection actually check?

Every home is different, but a thorough check usually covers:

• Water pressure and flow at several taps and showers, so the weak spots show up.
• The hot water system, its age and condition, and whether it is near the end of its life.
• Drains and sewer, ideally with a CCTV camera where there is access, to find blockages, root intrusion and cracked or misaligned pipe.
• Signs of leaks, past and present, including a meter test that shows water being lost while everything is turned off.
• Gas fittings and appliances, and whether the work looks like a licensed gas fitter did it.
• Toilets, taps and wet areas, where silent leaks and worn parts hide.
• Roof plumbing, gutters and the stormwater drainage around the property.
• Any obvious unlicensed or DIY work that has not been done to standard.

What are the common problems it picks up?

What we find most often in Canberra homes: tree roots in the sewer line, a hot water unit quietly near the end of its run, old galvanised pipe that has narrowed and taken the pressure with it, stormwater that pools against the house instead of draining away, hidden leaks that have been adding to the water bill for months, and the occasional bit of DIY work that was never done properly. None of it is the end of the world. It is just a lot better to know about before the place is yours.

When should you book it?

The most useful time is before your offer becomes unconditional, alongside your building and pest inspection, so you have the full picture before you commit. The way contracts and cooling off work in the ACT means there is usually a window to do your due diligence, but timing and conditions vary from sale to sale, so it is always worth confirming with your conveyancer or solicitor. If you have already bought, an inspection early on is still useful for planning and budgeting.

What happens if it finds something?

Finding an issue is not automatically a reason to walk away. It is information, and information gives you options. Depending on what turns up, you might factor the cost into your offer, budget to fix it after you settle, or in more serious cases think harder about whether the place is right for you. Either way, you are making the call with your eyes open rather than inheriting a surprise a few weeks in.