New South Wales excludes lodging from the tenancy regime through s.8(1)(c) of the Residential Tenancies Act 2010 (NSW), which covers agreements under which a person boards or lodges with another person. The position changes when the house provides beds for five or more residents, not counting the proprietor's family. The house is then a general boarding house that must be registered under the Boarding Houses Act 2012 (NSW). The occupancy principles in Schedule 1 then apply, including a security deposit capped at two weeks of occupancy fee and repaid within 14 days after the agreement ends. Below that threshold, a householder in business can face claims at NCAT under the Consumer Claims Act 1998 (NSW), while a claim against a private householder goes to the Local Court.
Victoria has no share house category in the Residential Tenancies Act 1997 (Vic), so the question is whether the property is a rooming house. Under s.3(1), a building with rooms available for rent becomes a rooming house when the total number of people who may occupy those rooms is four or more. Crossing that line brings council registration under the Public Health and Wellbeing Act 2008 (Vic), an operator licence under the Rooming House Operators Act 2016 (Vic) and minimum room standards. A double room let to a couple can push the count over the limit.
Queensland takes a hybrid approach under the Residential Tenancies and Rooming Accommodation Act 2008 (Qld). Where the provider lives on the premises and no more than three rooms are available, the arrangement is not rooming accommodation and the occupant is a boarder or lodger. The bond is the exception: any bond paid by a boarder or lodger must be lodged with the Residential Tenancies Authority within 10 days of receipt, and failing to lodge it is an offence. Other disputes about the agreement go to the Magistrates Court.
Western Australia leaves boarders and lodgers entirely outside the Residential Tenancies Act 1987 (WA). Bonds Administration does not hold lodger bonds, so the householder keeps the money and the agreement must say exactly when and how it is refunded. If there is no notice clause, a lodger can be asked to leave on reasonable notice with no reason given, and disputes go before a Magistrate.