2021 Michigan Building Code (2021 IBC incl. appendices F, G, H, with Michigan amendments, R 408.30401 et seq.) and 2021 Michigan Rehabilitation Code for existing buildings, both effective Apr 9, 2025. Enforced by Local enforcing agencies (cities, villages, townships, or counties that assume responsibility by ordinance); LARA Bureau of Construction Codes enforces where no local unit does (MCL 125.1508b). Verified on the primary source, re-checked weekly.
Single state construction code under 1972 PA 230 applies statewide. Companion codes: 2021 Mechanical and Plumbing codes and 2023 NEC effective Mar 12, 2024; 2021 Commercial Energy Code effective Apr 22, 2025.
Source: primary document
Statewide layer. County and city amendments sit on top; the building view resolves them from your ZIP.
Draft rule sets to adopt the 2024 IBC (2025-48 LR), a 2024 IEBC-based Rehabilitation Code and 2024 IECC had advisory meetings May 21, 2026; 2024 IPC/IMC public hearings Aug 5, 2026; none filed, no effective dates (120 days after filing)
2021 Michigan Building Code (2021 IBC incl. appendices F, G, H, with Michigan amendments, R 408.30401 et seq.) and 2021 Michigan Rehabilitation Code for existing buildings, both effective Apr 9, 2025. Single state construction code under 1972 PA 230 applies statewide. Companion codes: 2021 Mechanical and Plumbing codes and 2023 NEC effective Mar 12, 2024; 2021 Commercial Energy Code effective Apr 22, 2025.
Local enforcing agencies (cities, villages, townships, or counties that assume responsibility by ordinance); LARA Bureau of Construction Codes enforces where no local unit does (MCL 125.1508b).
Rulemaking pending. Draft rule sets to adopt the 2024 IBC (2025-48 LR), a 2024 IEBC-based Rehabilitation Code and 2024 IECC had advisory meetings May 21, 2026; 2024 IPC/IMC public hearings Aug 5, 2026; none filed, no effective dates (120 days after filing)
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