Common Plumbing Problems in Older Homes

Older homes have character, but their plumbing often reflects standards and materials from decades ago — here’s what tends to go wrong, and why.

Galvanised steel pipework

Common in homes built before copper and PVC became standard, galvanised pipes corrode from the inside out. The corrosion narrows the internal diameter over years, reducing water pressure, and eventually creates weak points prone to leaks.

Outdated geysers and valves

Older geysers often predate current safety standards — missing or incorrectly positioned pressure relief valves, no overflow tray, or no PIRB compliance certificate on file. Beyond the safety concern, older units are simply more likely to be near end of life.

Root intrusion in sewer lines

Mature gardens mean mature root systems, and older clay or unsealed pipe joints are more vulnerable to root intrusion than modern sealed PVC.

Outdated fixtures

Old ballcock-style toilet mechanisms, worn tap washers, and ageing shower valves are common sources of drips and running water that waste far more than they seem to.

Undersized or aging drainage

Drainage systems designed for a smaller household’s usage, or simply narrowed by decades of scale build-up, can struggle with modern water usage patterns — washing machines, dishwashers, multiple bathrooms.

What to do about it

Not every older home needs a full replumb, but a periodic inspection — particularly before a renovation or property sale — identifies which of these issues are actually present versus which are just a possibility, so you can prioritise real problems over guesswork.