Building Act 2016.

The objects of this Act are to – (a) ensure that – (i) building work, plumbing work and demolition work, including the design, and maintenance of domestic, commercial and industrial buildings, meets, or exceeds, the minimum national construction standards; and (ii) building work, plumbing work, demolition work and maintenance work do not negatively affect the health and safety of people; and (iii) owners, building services providers, practitioners and councils comply with the requirements of this Act and the National Construction Code when performing work, or performing functions and exercising powers, under this Act; and (b) provide for – (i) the creation of buildings that are accessible to, and contain facilities for, people with disabilities; and (ii) the creation of energy-efficient and water-efficient, and sustainable, buildings that minimise impact on the environment; and (iii) the legal protection of building services providers, practitioners and owners in certain circumstances in respect of work performed in accordance with this Act; and (c) facilitate and promote cost-effective construction of buildings; and (d) encourage an efficient, innovative and competitive building industry.
To what concern the plumbing work the act requires the licensed plumber who performs plumbing work to ensure that (a) a relevant permit, authorisation or notification is issued in respect of the work before it is commenced; and (b) the work is performed in accordance with the relevant permit; and (c) the quality of the materials used in the work is in accordance with the relevant permit or authorisation and this Act; and (d) the work is performed on land owned by the owner; and (e) the work is performed in a manner that does not cause a public health risk, danger to the public, an environmental nuisance, nuisance to an adjoining owner, damage to infrastructure; and (f) any directions in respect of the plumbing work under this Act are complied with; and (g) sufficient information is supplied to the owner for the owner to maintain the plumbing work, and plumbing installations, in accordance with this Act. The plumber who performs or supervises plumbing work must ensure that the work is performed in accordance with this Act and the National Construction Code and complies with any relevant plans and specifications.
Part 5, Special categories of work include works on contaminated or undrainable premises and other hazardous areas, penalties are listed. Part 9 - Notifiable Plumbing Work defines when is notifiable and the requirements and notification duties before and after performing the work. Part 12 - Permit Plumbing Work contains notification duties before and after performing the work; for the purposes of this Act, all plumbing work is permit plumbing work unless the work is (a) low-risk plumbing work; or (b) notifiable plumbing work; or (c) emergency work.