Effective today, the Cincinnati Zoning Code officially authorizes the construction and use of Accessory Dwelling Units (ADUs) in all areas where single-family homes are currently allowed.

ADUs are secondary housing units on the same lot as a primary, single-family residence. Common ADU types include apartments in basements or above garages, or small, detached structures behind a larger house.

“ADUs are a simple and unique way of providing housing,” said City Manager Sheryl Long. “Young renters who don’t need much space can move into converted garages or attic apartments. Seniors who are interested in downsizing can move into an ADU and still own the primary residence. Legalizing ADUs makes flexibility like this possible.”

“I want to thank the entire staff of the Department of City Planning and Engagement for their hard work on this change, and to assure the public that we’re standing by to help with any questions you may have,” said Katherine Keough-Jurs, Director of City Planning and Engagement. “The ADU ordinance was developed over the course of several years thanks to the leadership and hard work of the Property Tax Working Group and the Age Friendly Cincinnati Advisory Council. Their goal was to find options for seniors and people with disabilities and provide more flexibility for families.”

The law requires ADUs to be permanent structures (or permanent components of an existing structure) with their own entrances, and sets additional requirements regarding height, setback, and other features. Only one ADU is allowed per lot, and either the primary residence or the ADU must be occupied by the property owner or a designee.

For more information, click here, or call the City’s Zoning Info Line at (513) 352-2430.

City Council unanimously voted to legalize ADUs in June and established today—October 2, 2023—as the effective date for the change.