Section 18

Whenever default is made by an owner of any premises in the execution of any work required under this Act to be executed by him, an occupier of the premises may, with the approval of the Building Authority, cause the work to be executed and the costs and expenses thereof shall be paid to him by the owner or the amount may be deducted out of the rent from time to time becoming due from him to the owner and the occupier may, in the absence of any special agreement to the contrary, retain possession of the premises until the costs and expenses incurred by him have been fully reimbursed.