Michigan — Code Adoption Summary

Adoption model: Statewide-mandatory (LARA Bureau of Construction Codes); ~1,600 local units enforce via certified officials, state is AHJ where no local enforcement. Last verified: 2026-07-03 Confidence: verified Primary sources: MI LARA Bureau of Construction Codes — https://www.michigan.gov/lara/bureau-list/bcc · ICC MI

Statewide adopted codes — current (2026)

Code family	Adopted edition	Effective	Source
Building	2021 Michigan Building Code (2021 IBC base)	2025-04-09	michigan.gov/lara
Residential	Michigan Residential Code (2015→2021 cycle)		"
Electrical (NEC)	NEC 2023 (2023 Michigan Electrical Code, Part 8, 2nd printing)	2024-03-12	michigan.gov/lara
Mechanical	Michigan Mechanical Code (2021 IMC base)		"
Plumbing	2021 Michigan Plumbing Code (IPC 2021, 2nd printing)	2024-03-12	michigan.gov/lara
Energy	Michigan Uniform Energy Code (2021 IECC-based; residential Part 10)	2025-08-29	michigan.gov/lara

Solar PV / ESS / EV

Item	Status
NEC solar (690/705/706)	via NEC 2023
EV / energy	2021 IECC-based energy code

Adoption model & precedence

• Codes are statewide; enforced by certified local building depts, else the state Bureau is AHJ.
• Local amendments limited (more-stringent via state process).
• AHJ = certified local building department (or LARA BCC).

Major cities / counties

Jurisdiction	County	Notes	Building dept.
Detroit	Wayne	statewide code; Detroit BSEED enforcement	detroitmi.gov/bseed
Grand Rapids	Kent	statewide code	grandrapidsmi.gov
Warren / Ann Arbor	Macomb / Washtenaw	statewide code	respective depts

AHJ fallback (when local adoption is unverified)

• State baseline: 2021 MBC, NEC 2023, 2021 Michigan Plumbing (IPC 2021), 2021 IECC-based energy.
• Action: confirm the certified local dept (Detroit BSEED, etc.).

Change log

• 2026-07-03 — created; verified NEC 2023 (eff. 2024-03-12), 2021 MBC (eff. 2025-04-09), IPC 2021 plumbing, 2021 IECC-based energy.