Do I Need a Licensed Plumber for This?

In Victoria, almost all plumbing work must be carried out by a person who is licensed or registered with the Victorian Building Authority (VBA). That is not a guideline or an industry preference. It is the law, and it covers far more than most homeowners expect: water supply, sanitary work, drainage, gasfitting, roofing and stormwater, hot water installation and more.

The rules exist for a plain reason. Plumbing mistakes do not stay small. A bad drainage connection can contaminate drinking water. A poorly installed hot water unit can scald a child or, with gas, do far worse. An unlicensed repair inside a wall can leak quietly for months before the damage shows. The licensing system means the person doing the work has proven competence, carries insurance, and can be held accountable through the VBA if something goes wrong.

The list of plumbing tasks a Victorian homeowner may do without a licence is genuinely short. It is essentially limited to like-for-like maintenance on the accessible ends of the system.

Everything beyond that maintenance list needs a licensed or registered practitioner. Some of the jobs that catch homeowners out, because they look simple on a video tutorial, include replacing a whole tap or mixer (that is altering the water supply, not just servicing it), installing a dishwasher where no connection exists, replacing a toilet suite, repairing or replacing any pipework, installing or relocating a hot water unit, and any work at all on gas or below-ground drainage.

Gasfitting deserves its own sentence: it is never a DIY job in Victoria, full stop. Even swapping a gas appliance for the same model requires a licensed gasfitter, and gas work carries specific certification requirements.

It also does not matter that the materials are available at the hardware store. Being able to buy a flexible hose, a mixer tap or a hot water unit does not make installing it legal. The restriction is on the work, not the parts.

For certain categories of plumbing work in Victoria, the plumber must issue a compliance certificate. The certificate is your evidence that the work was done by a licensed practitioner and complies with the relevant standards, and it is backed by insurance the plumber is required to hold. Broadly, certificates are required for higher-consequence work above a set value and for specific types of work regardless of value, including gasfitting.

Keep every certificate you receive. They matter when you sell the house, when you claim on home insurance, and if a defect ever emerges. If a plumber does certifiable work and does not offer a certificate, ask why. The current rules on when a certificate is required are published by the VBA, and their website is the place to check rather than relying on what anyone tells you on the day.

Around Brighton, Hampton and Elwood, a large share of the housing stock predates modern plumbing standards. Edwardian weatherboards and Californian bungalows often still carry original galvanised or early copper pipework, imperial-sized fittings that do not match modern metric parts, and earthenware drains that are brittle after a century in the ground. A job that is routine in a new build can turn complicated fast in a 1915 house, which is exactly when unlicensed work does the most damage.

There is also an insurance angle. If unlicensed plumbing work contributes to a loss, you may find your insurer takes a very close interest in who did it. The cost gap between doing it properly and doing it twice, with a water damage claim in between, is not close.

If you are unsure whether a job needs a licence, the safe assumption in Victoria is that it does. Check the VBA website, or ask us. We would rather tell you over the phone that something is a legitimate DIY task than have you pay us for a washer change.