Where the erection of any building has been commenced, or is being carried out, or has been completed, in contravention of any restriction or condition imposed under sub-section (7) of section 11 or a plan for the re-development of any clearance area or in contravention of any notice, order or direction issued or given under this Act, the competent authority may, in addition to any other remedy that may be resorted to under this Act or under any other law, make an order directing that such erection shall be demolished by the owner thereof within such time not exceeding two months as may be specified in the order, and on the failure of the owner to comply with the order, the competent authority may itself cause the erection to be demolished and the expenses of such demolition shall be recoverable from the owner as arrears of land revenue;
Provided that no such order shall be made unless the owner has been given a reasonable opportunity of being heard.