The Plumbing Regulations 2018 define Gasfitting work as:

...the construction, installation, replacement, repair, alteration, maintenance, testing or commissioning of any pipe, appliance, flue, fitting, apparatus, control or other item that is involved with the supply or use of gas and that is fitted downstream of the gas supply point and includes:

  1. any gas appliance in, or on, a caravan or a vessel; and
  2. any roof sheeting and roof flashing that is necessary for the purpose of any work described in this subregulation; and
  3. any design work that is incidental to, or associated with, any work described in this subregulation.

Gasfitting work does not include:

  1. any specialised gasfitting work; or
  2. any Type B gasfitting work; or
  3. any cleaning, painting or preparation work in relation to gas pipes or gas pipe joints that does not involve the connection, disconnection or alteration of those pipes or joints; or
  4. the connection or disconnection of a gas storage container for the purpose of filling or refilling, exchanging, storing or disposing of the container; or
  5. any work in relation to an item that is involved with the supply or use of gas that relates to the propulsion system, or any system that is powered by the propulsion system, of any motor vehicle.

Registered and licensed plumbers must work to the Australian Standards for gas installations:

An Energy Safe Victoria (ESV) Start Work and Compliance Notice, submitted to ESV, is required for complex gas installations (as defined by the Gas Safety Act 1997).

A technical information sheet outlining the difference between a Standard Gas Installation and a Complex Gas Installation can be found on the ESV website.