AICWA has contacted DMRIS to obtain additional information on the recent changes (Jan 1st, 2019)  so as to understand requirements for landlords, buyers and sellers.
DMIRs previously advised that:   
The 2018 edition of AS/NZS 3000:2018, Electrical Installations (known as the Wiring Rules) is now available. The new standard has been developed by Standards Australia in collaboration with industry and government.

• Previously in residences, all final sub-circuits supplying socket outlets and lights had to be protected with 30mA RCDs. In future, all final sub-circuits in residential dwellings must be RCD protected. No exceptions.
• For non-residential, final sub-circuits up to 32A capacity supplying socket outlets must be 30mA RCD protected. Hard-wired equipment circuits of this capacity should be.
• All lighting final sub-circuits must be RCD protected.
  
• Alterations requiring a change to a circuit configuration trigger the requirement for 30mA RCD protection for that circuit. Like-for-like repairs do not.
• Where all protection devices are replaced in a switchboard, all final sub-circuits must be RCD protected.

Source:23rd January 2019 AICWA e-Newsletter