Gas Certificate of Compliance
A gas Certificate of Compliance is a licensed gasfitter's sign-off that gas work meets AS/NZS 5601.1. It is separate from the plumbing and electrical certificates.
Ask Chalkline about this →A gas Certificate of Compliance is the written sign-off a licensed gasfitter issues on completing gas installation, modification, or repair work, certifying that the work complies with AS/NZS 5601.1 (gas installations). It is the gas equivalent of the plumbing and electrical compliance certificates, and it is a separate document from each of them: gas work is its own licensed trade with its own sign-off.
Why it is separate
A building’s services compliance is documented in three separate streams, each by its own licensed trade:
- Gas work, certified by a licensed gasfitter (this certificate).
- Plumbing and drainage work, certified by a licensed plumber (see the NSW plumbing certificate of compliance).
- Electrical work, certified by a licensed electrician (under AS/NZS 3000).
Do not assume one covers another. A plumber’s certificate does not certify the gas, and the gas certificate does not certify the electrical connection of a gas appliance.
What it certifies
The gas certificate records that the installation has been tested and is safe to use. Under AS/NZS 5601.1 the gasfitter:
- Pressure-tests the new consumer piping before it is connected to gas supply, with no loss of pressure over the test period (verified 2026-05-25, AS/NZS 5601.1 Appendix E).
- Leak-tests the installation, using a soap-and-water solution or approved gas-detection equipment to locate any leak.
- Commissions each appliance, checking correct operation, gas pressures, burner performance, flue operation (for flued appliances), and that safety devices work.
The certificate is required before gas appliances are commissioned and the installation is put into service. An uncertified gas installation is not one to turn on.
State variation
Gas safety is regulated state by state, so the certificate’s exact name, form, and lodgement differ by jurisdiction (in Victoria, for example, gas safety is regulated by Energy Safe Victoria). The underlying standard (AS/NZS 5601.1) is national, but the compliance document and who it goes to are set by the state’s gas safety regulator. Confirm the specific certificate and process for the state the job is in rather than assuming a single national form.
For a builder
- Use a licensed gasfitter. Gas work must be done by a person licensed for gasfitting; it is not general plumbing or a DIY item.
- Get the gas certificate at completion. It is part of the handover and compliance pack, and the appliances cannot be safely commissioned without the testing it records.
- Keep all three certificates. Gas, plumbing, and electrical are separate sign-offs; collect each from the relevant licensed trade and file them with the job records.
- Sequence the commissioning. Gas appliance commissioning comes after the gasfitter’s tests; do not let an appliance be fired up before the certificate is done.
Also known as: gas CoC, gas compliance certificate, gasfitting certificate of compliance.
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See also
Last updated: 2026-05-25. Verified: 2026-05-25. Quarterly review for currency.