ADU Rules in Michigan (2026)
ADU rules in Michigan — no statewide ADU law. Regulation is entirely local. Key provisions and city-specific frameworks for accessory dwelling units.
Law Name
Preempts Local Ordinances
No — local rules may be stricter
Has State Law
No — regulation is local
Statewide Preemption Status Unconfirmed
No statewide preemption statute was confirmed for this jurisdiction — regulation is local. Local governments retain full authority to set their own rules.
Local Control Framework
Michigan does not have a comprehensive statewide ADU preemption law as of 2026 · Source
ADU regulation is left to local municipalities under the Michigan Zoning Enabling Act (PA 110 of 2006) · Source
Detroit, Grand Rapids, Ann Arbor, and Lansing each set their own local ADU rules · Source
Michigan Legislature has considered ADU reform bills but comprehensive statewide by-right ADU mandates had not been enacted as of 2026 · Source
Ann Arbor has been particularly progressive on ADUs, allowing them by-right in all residential zones · Source
Detroit's housing revitalization plans have included ADU provisions for infill development · Source
Legislative History
2023 — Michigan ADU Reform Bills (proposed, not enacted) · Source
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. · Source
Source: Michigan Local Zoning Authority. Last verified April 5, 2026. View source