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A gas safety certificate is the gas fitter's declaration that the install or repair meets the Gas (Safety and Measurement) Regulations and the relevant NZ standard.
It records what work was done, the appliance details, the test results, and the registered gas fitter who signed it off. The certificate goes on the job record with the Plumbers, Gasfitters and Drainlayers Board so it's verifiable later.
You need a gas safety certificate for any new gas appliance install, any alteration to a gas line, any conversion (electric to gas, natural gas to LPG or vice versa), and any repair to a gas line or appliance after a leak.
Like-for-like swaps and basic appliance servicing have lighter requirements but still need a registered gas fitter to do the work.
Three reasons that hit homeowners in real situations.
Insurance - house insurance won't cover damage from non-certified gas work, including fire damage caused by a faulty install. Sale of property - buyers and their solicitors increasingly ask for gas certificates on file before unconditional. Legal - uncertified gas work is illegal in New Zealand and the homeowner can be held responsible if the installer wasn't registered.
