Such buildings shall be constructed and installed in accordance with the requirements of this code and shall bear the Insignia of Approval by the Secretary of State.
Exception: An Insignia of Approval shall not be required for the following buildings:
Exception: An Insignia of Approval shall not be required for the following buildings:
- Modular buildings with structural components that cannot be inspected at the installation site but can be inspected in accordance with Section 1704 of this code at the manufacturing facility in which it was built.
- Buildings of Group S or U occupancy having an area not exceeding 400 square feet and not customarily used for human occupancy.