2021 Michigan Residential Code Filed

 The Construction Code – Part 5. Residential Code rules were filed with the Secretary of State on May 1, 2025, and will become effective on August 29, 2025. The rules were adopted by reference to the 2021 edition of the International Residential Code, with amendments, deletions, and additions deemed appropriate for use in Michigan. 

The bureau will notify the public when each code’s electronic and hard copy versions are available for purchase and update the code book information on our website, which links to the ICC for purchase. Below are some important changes that have been made to the code.

• One important change is R301.1.4 Intermodal shipping containers. This is an addition to the code to provide criteria to address minimum safety requirements for repurposing these containers, new and used, for occupiable use.
• Electrical rules duplicating the adoption of the National Electrical Code were rescinded to directly reference the Michigan Electrical Code.