Section 3 defines "lodging house"
http://www.austlii.edu.au/au/legis/wa/consol_act/ha191169/s3.html
(more than 6 unrelated people living in a house)
Then theres a bunch of provisions governing the "lodging houses" later in the Act.
So keep it under 7 people and I don't think there...
In WA theres currently no boarding specific legislation - but I believe its the health Act that says no more than 6 unrelated people living in a house.
The main issue with renting a house out room by room is that there law strongly suggests that each separate room is a "tenancy" and covered...