(1) Where an order for demolition of a building under section 7 has been made the owner of the building or any other person having an interest therein shall demolish that building within the time specified in that behalf by the order; and if the building is not demolished within that time the competent authority shall enter and demolish the building and sell the materials thereof.
(2) Any expenses incurred by the competent authority under sub-section (1), if not satisfied out of the proceeds of sale of materials of the building shall be recoverable from the owner of the building or any other person having an interest therein as arrears of land revenue.