(1)  In any proceedings relating to work under this Act, evidence in writing of the engagement of a person as a building surveyor by a person purporting to be the owner of the premises is, unless the contrary is shown, taken to be evidence that the building surveyor was engaged by the owner or a person acting on behalf of the owner.

(2)  In any proceedings relating to work under this Act, any application under this Act that is made, or purportedly made, by a person acting as an agent of an owner is, unless the contrary is shown, taken to be evidence that the person was the agent of the owner.