When a licensed plumber finishes a job, you should usually get more than an invoice. For many jobs, the plumber also has to certify in writing that the work meets the plumbing rules. That document is generally called a compliance certificate, and it's one of the most useful pieces of paper you can keep about your home.
Each state runs its own system, with its own names, triggers and deadlines. This guide covers the main ones, with links to the official sources, so you know what to ask for. Rules change, so check your state regulator for the current position before relying on any detail.
Why the certificate matters
A plumbing compliance certificate is the plumber's formal statement that the work complies with the relevant plumbing codes and standards. It's worth having because it:
- Records who did the work. It names the licensed plumber who is responsible, along with what they did and where.
- Can link to longer-term protection. In Victoria and Western Australia, the official guidance ties the certificate to six years of protection (more on that below).
- Helps when you sell, rent or renovate. Buyers, insurers and the next plumber may want to know what was done and by whom.
- Gives you a paper trail. If a leak or fault turns up later, the certificate shows who was responsible for the work.
If a plumber tells you a certificate "isn't needed", ask why and check with your state regulator.
New South Wales: Certificate of Compliance
The NSW Government's plumbing inspection documents page says a Certificate of Compliance confirms the work complies with the plumbing laws, the Plumbing Code of Australia and the relevant Australian Standard, and identifies the plumber or drainer as the responsible person for that work.
The same page says plumbers and drainers must complete a certificate at the end of all plumbing and drainage work and give a copy to the person who arranged the work, such as the property owner or builder. Work that needs an inspection also involves lodging the certificate with Building Commission NSW or the local plumbing regulator.
The Plumbing and Drainage Act 2011 adds that if someone other than the owner hired the plumber, such as a builder, they must pass a copy of the certificate on to the owner or the owner's agent. Depending on the job, you may also receive a sewer service diagram showing where the drainage runs. Keep it with the certificate.
Victoria: compliance certificate
The Building and Plumbing Commission's compliance certificate guidance says only a licensed plumber can issue a compliance certificate. Registered plumbers must work under a licensed plumber's supervision or stick to work that doesn't need a certificate.
According to the BPC, a certificate is required where the total value of the work, including materials, appliances, labour and GST, exceeds $750, even if you bought the materials yourself. Some work needs one regardless of cost, including:
- installing, relocating or replacing certain gas appliances
- installing, modifying or relocating consumer gas piping
- work on below-ground sanitary drains
- work on cooling towers.
The plumber must give you the certificate within five days of finishing the work and lodge it with the regulator in the same timeframe. The Victorian Building Authority's insurance guidance explains that licensed plumbers must hold insurance for work that requires a certificate, and that the work is covered for six years.
Queensland: Form 4 for notifiable work
Queensland handles a lot of everyday home plumbing as "notifiable work". The QBCC's page on what notifiable work is lists common examples such as kitchen and bathroom renovations, installing or replacing water heaters, and installing or relocating toilets, showers, basins and sinks. Plumbing for new construction is permit work instead, which goes through the local council.
For notifiable work, the plumber must register the job with the QBCC on a Form 4 within 10 business days of invoicing, and give a copy to the owner or the person who engaged them. The QBCC's registration guide says the copy must reach the customer within 20 business days of registering the work. The QBCC also notes you can use its online registers to check whether a Form 4 has been lodged for your property.
Western Australia: Certificate of Compliance
The WA Government's plumbing work in your home page says that for major plumbing work, such as new fixtures, new drainage or replacing a water heater, your licensed plumbing contractor must give you a certificate of compliance within five working days of finishing. It says the certificate gives you six years of assurance that the work was done to the plumbing standards.
WA plumbers usually lodge notices electronically. The government's eNotice guide says a copy is emailed to the customer if the plumber provides their email address, so it's worth giving yours.
Other states and territories
South Australia, Tasmania, the ACT and the Northern Territory have their own plumbing certification and notification rules. Ask your plumber which certificate applies to your job and when you'll get it, or check with your local plumbing regulator.
Gas and electrical work often come with separate paperwork. If a job involves more than one trade, such as a new hot water system, ask each tradie what they'll provide. Our guide to electrical compliance certificates covers the electrical side.
What to check on your certificate
When it arrives, take a minute to check:
- Your name and address are correct.
- The description matches the job. A vague line like "plumbing work" isn't much help later.
- The licence number belongs to the plumber you hired. Look it up on your state register. Our guides to checking a QBCC licence and checking a builder or plumber licence in WA show how.
- The date lines up with when the work was finished.
File it with your quote, invoice and any warranty paperwork. A simple digital folder makes life easier when you sell, claim on a warranty or book the next job.
Ask about it before the job starts
The easiest way to avoid chasing paperwork is to raise it upfront. When you compare quotes, ask each plumber which certificate they'll issue and how you'll receive it. That's especially worth doing for bigger jobs like a hot water system replacement or a bathroom renovation. For more questions to ask, see how to choose a plumber.
If you need a licensed plumber, you can search the plumbers directory or browse by area, such as plumbers in Sydney, and contact local businesses directly.
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Frequently asked questions
Do I get a plumbing certificate for a small repair?
It depends on the state and the job. In Victoria, a certificate is generally needed when the work passes a value threshold or involves gas, drains or cooling towers. In NSW, the official guidance says a certificate is completed at the end of all plumbing and drainage work. Ask your plumber before the job starts.
What if my plumber doesn't give me a certificate?
Ask for it first and give them your email address. If it still doesn't arrive, contact your state's plumbing regulator. In Queensland, you can also check the QBCC registers to see whether a Form 4 was lodged for your property.
Is a compliance certificate the same as a warranty?
Not exactly. The certificate confirms the work met the rules when it was done. In Victoria and WA, the official guidance links it to six years of protection, but product warranties from manufacturers are separate.
Can a registered plumber issue a certificate in Victoria?
No. According to the Building and Plumbing Commission, only licensed plumbers can issue compliance certificates. Registered plumbers must work under a licensed plumber's supervision for work that needs one.
This guide is general information only, not legal or financial advice. Rules change, so check the official sources linked above for your state.