ADU Laws in Michigan (2026)
Michigan state ADU law details, key provisions, preemption status, and recent legislative changes for accessory dwelling units.
Law Name
State ADU Law
Preempts Local Ordinances
No — local rules may be stricter
Has State Law
Yes
Key Provisions
Michigan does not have a comprehensive statewide ADU preemption law as of 2026
ADU regulation is left to local municipalities under the Michigan Zoning Enabling Act (PA 110 of 2006)
Detroit, Grand Rapids, Ann Arbor, and Lansing each set their own local ADU rules
Michigan Legislature has considered ADU reform bills but comprehensive statewide by-right ADU mandates had not been enacted as of 2026
Ann Arbor has been particularly progressive on ADUs, allowing them by-right in all residential zones
Detroit's housing revitalization plans have included ADU provisions for infill development
Legislative History
2023 — Michigan ADU Reform Bills (proposed, not enacted)
Michigan Legislature considered several bills to allow ADUs by right statewide, but comprehensive ADU preemption had not been enacted as of 2026. Local municipalities retain land use authority under the Michigan Zoning Enabling Act.
Official Sources
Source: Michigan State ADU Law. Last verified April 5, 2026. View source