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Zoning: Accessory Dwelling Units

Status

As of 2018-12-18 this document is obsolete. The City Commission ratified changes to the zoning concerning ADUs on that date. Theoretically there will be another set of changes sometime in March/April/May/... at which point this document is will be updated to reflect whatever that result is.

Briefly, the changes on 2018-12-18 were:

  • Floor area ratio changed to 40% (from 25%). Size now has a hard limit of 850sq/ft. Minimum remains 400sq/ft.
  • Height reduced from 25ft to 20ft, except in some extremely rare cases.
  • Minimum lot area of 5,000sq/ft removed, now lots only need to be conforming to the minimum lot size of the zone.
  • Confusion between ADU size and Accessory Structure size has been resolved; and ADU doubles the sq/ft allowed in the Accessory Structure.
  • No change to permitting process.
  • No change to Owner Occupancy or Deed Restriction requirement.
  • No change to unit (1), occupancy (2), or bedroom (2) limit.

Disclaimer & Purpose

This is not an official document; this document is not endorsed by the Grand Rapids Planning Commision, nor are its authors qualified to present legal opinions.

The purpose of this document is to provide an introduction to the regulations related to Accessory Dwelling Units in the city of Grand Rapids, MI as of 2018. Within the Zoning the topic of Accessory Dwelling Units are directly addressed in section [5.9.03]. Other sections of the code may still impact the development of ADUs so we have attempted to cross-reference the most relevant sections.

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