Plans and specifications showing the proposed work in the necessary detail shall be submitted when requested by the Building Inspector. If a permit is denied, the applicant may submit revised plans and specifications without payment of any additional fee. If, in the course of the work, it is found necessary to make any change from the plans and specifications on which a permit was issued, amended plans and specifications, and fees in the amount of half the fees originally required shall be submitted. A supplementary permit, subject to the same conditions applicable to the original application for a permit, shall be issued to cover the change.