Whenever a food establishment is constructed or extensively remodeled, and whenever an existing structure is converted to use as a food establishment, plans and specifications shall be submitted to the commissioner for review and approval before construction, remodeling, or conversion begins. The plans and specifications shall indicate the proposed layout, arrangement, mechanical plans, construction materials and work areas, and the type and model of proposed fixed equipment and facilities. The commissioner shall approve the plans and specifications, if they meet the requirements of this part and rules and regulations. No food establishment shall be constructed, extensively remodeled or converted, except in accordance with plans and specifications approved by the commissioner. Any deviation from the submitted plans and specifications previously approved by the commissioner discovered during an inspection that would not compromise the safety of food products shall not delay the issuance of a permit to operate a food establishment.