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The Western Australia guide to standards and tolerances 2019 (the Guide) has been developed for use by builders and building owners as a convenient reference for acceptable standards of workmanship in residential building construction; it is intended to address areas that are not prescribed under legislation or under a home building contract.

AS/NZS 3500.4:2025 specifies the requirements for the design, installation and commissioning of heated water services using drinking water or rainwater or a combination thereof. It includes aspects of the installation from the valves on the cold-water inlet to any cold-water storage tank or water heater and the downstream fixtures and fittings. It applies to new installations as well as alterations, additions and repairs to existing installations

As a subcontractor, it is your responsibility to fully understand your rights and obligations in the relationship with your head contractor under contract law, before you enter into any subcontracting arrangement.