Is There a "Form 4" for Gas in Queensland? What It Actually Means
Short answer: Form 4 is not a gas document. It is the QBCC's Notifiable Work form for plumbing and drainage. A separate gas compliance certificate, issued through Resources Safety and Health Queensland, covers the gas fitting itself. Gas hot water replacement is the one job that commonly needs both.
Two different regulators, two different forms
It's an easy mix-up. Queensland has two separate compliance systems that both touch gas hot water work, run by two different regulators. The Queensland Building and Construction Commission (QBCC) oversees plumbing and drainage, and its Form 4 is a notice that notifiable work has been carried out at a property, covering who did the work, what was done, and where. Resources Safety and Health Queensland (RSHQ) oversees gas fitting under the Petroleum and Gas (Production and Safety) Act 2004, and its output is the gas compliance certificate described in our main QLD guide.
"Notifiable work" is a defined category under the Plumbing and Drainage Regulation 2019 that lets a licensed plumber or drainer do the work without a local government permit or mandatory inspection, provided they lodge a Form 4 with the QBCC afterwards. The QBCC's own guidance lists installing or replacing water heaters, including gas, electric, solar or heat pump, as one of the common examples of notifiable work.
Why gas hot water needs both documents
A gas hot water system replacement sits across both systems at once. The plumbing side (connecting or relocating pipework, the tempering valve, drainage) is notifiable work under QBCC rules, and the tradesperson must lodge a Form 4 within 10 business days of invoicing you. The gas side (connecting the unit to the gas supply and confirming it is safe to operate) needs its own gas compliance certificate from a licensed gas fitter under RSHQ rules.
In practice, many licensed plumber-gasfitters hold both a plumbing licence and a gas work licence and can issue both documents from the same job. If you are hiring separately, or your tradesperson only holds one licence type, confirm you are getting both records before you consider the job finished: a Form 4 for the plumbing side and a gas compliance certificate for the gas connection.
What to ask for
If a QLD tradesperson mentions "Form 4" in relation to gas hot water or another plumbing-adjacent gas job, ask specifically: will I also receive a gas compliance certificate for the gas connection itself? A Form 4 alone does not certify the gas fitting is safe. If your job is pure gas fitting with no plumbing/drainage component, such as a gas cooktop or a heater on an existing gas line, Form 4 generally doesn't apply at all, and the gas compliance certificate is the only document you need.
Frequently asked questions
Is Form 4 the same as a gas compliance certificate in QLD?
No. Form 4 is a QBCC plumbing and drainage notifiable-work form. A gas compliance certificate is a separate document from a licensed gas fitter under Resources Safety and Health Queensland.
Do I need Form 4 for a gas cooktop installation?
Usually not on its own, since installing a cooktop is gas fitting work, not plumbing and drainage notifiable work. You do need a gas compliance certificate for the gas connection.
Sources
Checked July 2026. General information only, not legal advice: see our about page.
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