If after inspection, investigation, or examination, or at any time as the work progresses, the executive director finds that changes or amendments are necessary to ensure safety, he may request the owner to revise his or her plans and/or specifications. Alterations of the plans and specifications must be approved by the executive director before work commences under the changes, except in emergencies requiring immediate action, in which instance the executive director shall be immediately notified. If the proposed alterations would result in deviation from the approved plans, amendment of the approved plans must be obtained from the commission. An application must be submitted for approval of the amendment. If, in the opinion of the executive director, the amendment would have a potential adverse affect on property owners' rights which is materially different from that in the initial approval process, he shall inform the applicant, and notice must again issue in compliance with §§ 301.51-301.57 of this title (relating to Notice and Hearing).