Before proceeding with any work of the kind specified in Section 3 of this ordinance, an application for a certificate of occupancy shall be filed with the Inspector of Buildings. Applications shall include plans in duplicate drawn to scale in ink or blueprint, giving dimensions, radii and angles of the lot, the heights, dimensions and locations thereon of all buildings whether existing or proposed, their existing and intended uses, the number of families to be housed and such other information as may be necessary to determine and provide for the enforcement of this ordinance. One (1) copy of any such plans, if and when approved by the Inspector of Buildings, shall be returned to the applicant with such permit as may be granted.