ADU Rules in Grand Rapids, Michigan

Grand Rapids is the Kent County seat and Michigan's second-largest city, with a population of about 200,000 on the Grand River in western Michigan. A growing city known for craft beer, art, healthcare (ArtPrize, Spectrum Health), and furniture manufacturing heritage, Grand Rapids has been one of Michigan's most economically dynamic cities. The city has been working to expand housing options. Michigan has no statewide ADU preemption law — Grand Rapids's local Zoning Ordinance governs.

Grand Rapids Zoning Ordinance

The City of Grand Rapids Zoning Ordinance governs all land use in Grand Rapids city limits.

Permitted ADU Types

Per Grand Rapids Zoning Ordinance (verify current standards):

• Detached ADUs: Carriage houses, backyard cottages
• Attached ADUs: Additions with separate entrance
• Interior conversions: Basement and upper-floor conversions
• Garage conversions: Converting existing garage to ADU

Verify current provisions with Grand Rapids's Planning Division.

Size Limits

Per Grand Rapids Zoning Ordinance:

• Maximum floor area per zone
• Lot coverage restrictions

Setbacks

Per Grand Rapids residential zone:

• Rear: Minimum setback
• Side: Minimum setback

Grand River Flood Zones

Parts of Grand Rapids near the Grand River may be in FEMA flood zones. Verify flood map status for riverfront properties.

Michigan Wetlands / EGLE

Properties near wetlands or waterways may require review from EGLE (Michigan Department of Environment, Great Lakes, and Energy). Michigan's wetland regulations apply to many natural features.

Historic Districts

Grand Rapids has local historic districts including Heritage Hill and others. Properties in historic districts require review by the Grand Rapids Historic Preservation Commission.

Permit Process

1. Verify zoning: Grand Rapids Planning Division
2. Historic Preservation review: If in a local historic district
3. Check flood zone: If near the Grand River
4. Submit plans: Grand Rapids Development Center
5. Building permit and inspections
6. CO: Required before occupancy

Contact

City of Grand Rapids Planning Division 1120 Monroe Avenue NW, Suite 300, Grand Rapids, MI 49503 Phone: (616) 456-4100 Website: grandrapidsmi.gov/government/departments/planning

Disclaimer: Michigan has no statewide ADU law. Grand Rapids zoning governs locally. Verify current ADU standards with the City of Grand Rapids before starting any project.