The building inspector shall have the power to order all work stopped on construction or alteration or repair of buildings or structures in the city when such work is being done in violation of any provision of any ordinance relating thereto, or in violation of any zoning ordinance. Work shall not be resumed after the issuance of such an order, except on the written permission of the inspector or the mayor; provided, that if the stop order is an oral one, it shall be followed by a written stop order within an hour. Such written stop order may be served by any policeman. (Prior code § 2-9-5)