ADU rules in Grand Rapids, MI — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Grand Rapids permits Accessory Dwelling Units (ADUs) in residential zones. ADUs must be 400-850 sq ft, not exceed 40% of the main house floor area, and cannot be rented for less than 30 days.
Grand Rapids adopted ADU regulations allowing attached, detached, or internal accessory dwelling units in residential zoning districts. The floor area must be at least 400 sq ft and no more than 850 sq ft or 40% of the main house's gross floor area, whichever is less. ADUs used as rental properties must have lease terms of at least 30 days and may not be rented to more than 11 different parties per calendar year. ADUs must meet building code requirements and obtain building permits. Design must be compatible with the primary residence.
Unpermitted ADUs must be brought into compliance. Renting for under 30 days violates the zoning ordinance and may result in enforcement action.
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See how Grand Rapids's adu rules rules stack up against other locations.
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