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What plumbing work you can legally do yourself

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Most home repair content online is written for the US or the UK, where this line sits somewhere else entirely. In Australia it is drawn tightly, and it is drawn by your state — not nationally.

The short version: in Australia, the great majority of plumbing work must be carried out by a licensed plumber. Gas work is licensed gasfitting, electrical work is licensed electrical work, and the details of who may do what are set by each state and territory, through its own regulator.

That is why this site does not publish a national list of DIY-legal jobs. There isn't one. What we can do is explain how the system works, so you can check your own in a few minutes and know what you are looking at.

Why it matters, beyond the penalty

Penalties exist, but they are rarely the thing that actually costs people.

  • Insurance. Water damage traced back to unlicensed work is a straightforward claim decline, and water damage is expensive out of proportion to the job that caused it.
  • Selling the property. Unlicensed alterations surface during inspections and become a negotiating point or a rectification cost.
  • Backflow. The rules around cross-connections exist because a badly connected outlet can pull contaminated water into the drinking supply — yours, and potentially the street's. This is the reason the rules are strict rather than merely bureaucratic.
  • Gas and electricity. Both are present in hot water systems, and both fail in ways that are not recoverable.

What is generally treated as minor maintenance

Broadly, and subject to your own state's rules, work that does not alter the water supply or drainage system tends to be treated as maintenance rather than licensed plumbing work. Typically that includes:

  • Replacing a tap washer or a tap handle.
  • Cleaning or replacing a shower rose or a tap aerator.
  • Clearing a local blockage with a plunger, or removing and cleaning a sink trap.
  • Replacing a toilet seat.
  • Cleaning gutters, and general maintenance of a standalone garden rainwater tank.

What is plumbing work almost everywhere

  • Replacing a tap, mixer or any fixture — as opposed to replacing its washer.
  • Cutting into, extending or altering pipework of any kind.
  • Installing or replacing a hot water system, and work on its valves.
  • Anything on the drainage system beyond clearing a local blockage: relining, repairing, replacing or re-grading.
  • Connecting a rainwater tank to the house supply, toilets or laundry, and any mains top-up arrangement.
  • Installing or servicing backflow prevention devices.
  • Anything on the gas side of an appliance, which is gasfitting, not plumbing.

The compliance certificate

For notifiable work, a licensed plumber is generally required to issue a compliance certificate — the document stating the work was performed by someone licensed and complies with the applicable standards.

Three practical points. Ask for it up front, as part of agreeing the job, not afterwards. Keep it with the property records, because it is what you produce at sale time. And treat resistance to issuing one as an answer in itself.

How to check your own state in five minutes

Every state and territory has a regulator that publishes what counts as plumbing work, who must be licensed, and how to verify a licence. Two examples of the kind of page you are looking for: NSW Fair Trading's plumbers, drainers and gasfitters pages, and the QBCC in Queensland. Search for your own state's equivalent.

While you are there, do the other useful thing: check the licence of whoever you are about to hire. Every regulator publishes a licence lookup, it takes a minute, and it is the single most effective piece of due diligence available to a homeowner.

The technical rules behind it

The technical requirements themselves come from the National Construction Code, whose Volume Three is the Plumbing Code of Australia, and the AS/NZS 3500 standards it references. You do not need to read them. What is worth knowing is that they exist, that they are what "compliant" means, and that they are why a plumber will sometimes refuse to do something the way you had in mind.

How this site handles the line

Every fault page here ends the same way: what the symptom means, what you can safely check, what the part is called, and the point where the job becomes licensed work. We would rather tell you that a licensed plumber is needed and tell you exactly what to ask them for, than pretend a job is DIY because that makes for a more satisfying article.

Frequently asked questions

Can I replace a tap myself in Australia?

Replacing the tap itself is generally plumbing work, while replacing its washer is generally treated as minor maintenance. The boundary is set by each state and territory, so check your own regulator rather than a general answer.

What is a plumbing compliance certificate?

It is the document a licensed plumber issues for notifiable work, stating it was done by a licensed person and complies with the applicable standards. Ask for it when you agree the job and keep it with the property records.

Is there one national rule for DIY plumbing in Australia?

No. The technical requirements come from the National Construction Code and AS/NZS 3500, but licensing and what counts as notifiable work are set by each state and territory.

How do I check a plumber's licence?

Every state and territory regulator publishes a licence lookup. It takes about a minute and is the most effective check available to a homeowner before hiring.

Sources

What this page explains is based on these official sources. If you check one and it does not match what you read here, send it to us and the article gets corrected.

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