The code requires that modifications to manufactured structures must be:

Modifications to manufactured structures are required to be approved through formal procedures to ensure that any changes made adhere to safety standards, regulations, and the integrity of the structure. This process typically involves submitting plans or specifications for the proposed modifications to a designated authority, such as a building inspector or regulatory body, which evaluates them for compliance with applicable codes and standards.

Formal procedures serve multiple purposes, including ensuring public safety, maintaining quality control, and upholding construction and building standards. By requiring approval through established processes, the code safeguards against unauthorized or unsafe alterations that could affect the structural integrity or safety of manufactured buildings.

Other options do not align with the regulatory framework that governs building modifications. Time constraints without oversight can lead to unsafe practices, informal documentation would not provide the necessary legal backing or traceability, and solely discussing modifications with the original manufacturer without involving regulatory approval might fail to meet the necessary codes and standards.