Criminal Code Act 1899

It is lawful for a person who is in peaceable possession of any land, structure, vessel, or place, or who is entitled to the control or management of any land, structure, vessel, or place, and for any person lawfully assisting him or her or acting by his or her authority, to use such force as is reasonably necessary in order to prevent any person from wrongfully entering upon such land, structure, vessel, or place, or in order to remove therefrom a person who wrongfully remains therein, provided that he or she does not do grievous bodily harm to such person.

It is lawful for a person who is in peaceable possession of any land, structure, vessel, or place, or who is entitled to the control or management of any land, structure, vessel, or place, and for any person acting by his or her authority, to use the force that is reasonably necessary in order to remove therefrom any person who conducts himself or herself in a disorderly manner therein, provided that he or she does not do the person grievous bodily harm.

In this section—place includes any part of an enclosure or structure, whether separated from the rest of the enclosure or structure by a partition, fence, rope, or any other means, or not. sch 1 pt 5 ch 26 s 277 amd 1997 No. 3 s 40