Plumbing problems are among the most expensive surprises in a new home. Melbourne’s older housing stock — particularly terrace houses, Californian bungalows, and post-war homes — can hide significant plumbing issues behind fresh paint. Here’s what to check before you exchange contracts.
1. Ask About the Age and Type of Pipes
Melbourne homes built before the 1970s often have galvanised steel pipes, which corrode internally over time and can restrict water flow and contaminate water. Homes built before the 1990s may also have copper pipes with lead solder joints. Ask the agent or vendor what the pipes are made of, and have a plumber inspect if you’re unsure.
2. Check Water Pressure at Multiple Taps
Turn on multiple taps simultaneously and check the pressure. Low pressure can indicate corroded pipes, a partially closed isolation valve, or supply issues. High pressure (over 500kPa) can accelerate wear on fittings and cause leaks.
3. Inspect the Hot Water System
Check the age of the hot water system — it should be displayed on the unit. Gas storage systems last 10–12 years; electric 10–15 years. If the system is near end of life, factor in $1,500–$4,000 for replacement depending on type. Look for rust around the base of tank-style systems, which indicates internal corrosion.
4. Check Toilets for Running or Leaking
Put a few drops of food dye in the cistern and wait 10 minutes without flushing. If colour appears in the bowl, the outlet valve is leaking. A running toilet wastes thousands of litres of water per day. Also check for movement in the toilet base — can indicate a failed seal.
5. Look Under Sinks and Vanities
Check for water stains, mould, or swelling in cabinet floors and walls under sinks. These indicate past or current leaks. Also check the condition of flexible hoses — these have a lifespan of 10 years and are a leading cause of home flooding when they fail.
6. Inspect the Shower and Bath
Check grout and silicone seals around the shower base and walls for cracks or gaps. Press on tiles around the shower — any movement suggests water has penetrated behind the tiles. A leaking shower base can cause significant damage to subfloor framing in timber-floored Melbourne homes.
7. Book a CCTV Drain Inspection
This is especially important for Melbourne homes with established trees. A CCTV drain camera inspection will reveal tree root intrusion, cracked clay pipes, or collapsed sections in the sewer line before you buy. Drain relining or replacement can cost $5,000–$20,000+ depending on the extent.
8. Check the Gas Installation
If the home has gas appliances, check that all appliances have current service records. Look for any signs of poorly installed or modified gas pipework. A licensed gas fitter can conduct a pressure test to confirm the integrity of the gas installation.
Sedcon Plumbing provides pre-purchase plumbing inspections across Melbourne. Call 0468 013 012 to book an inspection before your building and pest report.