Regulatory framework
The code baseline for Genesee County.
Michigan's current published codes for 2026 are the 2021 Michigan Building Code (effective April 9, 2025), 2015 Michigan Residential Code (still in effect while the 2021 residential update remains enjoined), 2021 Michigan Rehabilitation Code (effective April 9, 2025), 2021 Michigan Mechanical and Plumbing Codes (effective March 12, 2024), 2023 National Electrical Code with Michigan amendments (effective March 12, 2024), and 2021 Michigan Commercial Energy Code (effective April 22, 2025). Local agencies may administer these codes under their delegated authority.