ADU Rules in Detroit, Michigan

Detroit is Wayne County's largest city and Michigan's largest city, with a population of about 630,000 — down from its peak of 1.85 million in 1950. The center of the American automotive industry ("Motor City"), Detroit has undergone decades of population loss and deindustrialization, followed by significant revitalization efforts in recent years. Detroit has abundant vacant land and a strategic focus on filling in neighborhoods — ADUs are part of the city's housing revitalization strategy. Michigan has no statewide ADU preemption law — Detroit's local Zoning Ordinance governs.

Detroit Zoning Ordinance

The City of Detroit Zoning Ordinance governs all land use in Detroit. The city has been working to simplify ADU and accessory structure approvals as part of its Detroit Future City / Detroit Strategic Framework Plan to revitalize neighborhoods.

Permitted ADU Types

Per Detroit Zoning Ordinance (verify current standards):

• Detached ADUs: Common given Detroit's lot sizes and alley-oriented block patterns
• Attached ADUs: Additions with separate entrances
• Interior conversions: Basement and upper-floor conversions
• Garage conversions: Converting existing garages to ADUs

Verify current ADU provisions with Detroit's Planning and Development Department.

Size Limits

Per Detroit Zoning Ordinance:

• Maximum floor area per zone
• Lot coverage restrictions

Setbacks

Per Detroit residential zone:

• Rear: Minimum setback
• Side: Minimum setback

Detroit River Flood Zones

Parts of Detroit near the Detroit River may be in FEMA flood zones. Verify flood map status for properties near the river.

Michigan Environmental Protection Act — Waterfront

Properties near the Detroit River or inland waterways may be subject to Michigan's environmental review requirements. Contact EGLE (Michigan Department of Environment, Great Lakes, and Energy) for waterfront properties.

Historic Districts

Detroit has historic districts including Indian Village, Boston-Edison, and others. Properties in local historic districts require review by the Detroit Historic District Commission.

Lead Paint and Environmental Context

Detroit has significant older housing stock with lead paint concerns. Major renovation work on pre-1978 homes requires lead-safe work practices under EPA/HUD rules.

Permit Process

1. Verify zoning: Detroit Planning and Development Department
2. Historic District review: If in a local historic district
3. Check flood zone: If near the Detroit River
4. Lead paint requirements: For pre-1978 structures
5. Submit plans: Detroit Buildings, Safety Engineering and Environmental Department (BSEED)
6. Building permit and inspections
7. CO: Required before occupancy

Contact

Detroit Planning and Development Department 2 Woodward Avenue, Suite 808, Detroit, MI 48226 Phone: (313) 628-2195 Website: detroitmi.gov/government/departments/planning-and-development

Detroit BSEED (Building Permits) Coleman A. Young Municipal Center, 2 Woodward Avenue, Suite 401 Phone: (313) 628-2451

Disclaimer: Michigan has no statewide ADU law. Detroit's zoning governs locally. ADU policy has been evolving as part of city revitalization. Verify current standards with Detroit before starting any project.