If the local authority is not satisfied as to the exact position of the boundaries of a site on which a building is to be erected or is in the course of being erected, it may, by written notice served upon the owner of the site concerned-

a) direct the owner to engage, at his own expense, a registered land surveyor to establish the precise position of the boundaries of the site; and

b) prohibit all further building work until the position of the boundaries has been precisely established;

and the owner shall thereupon comply with the terms of the direction and any prohibition.