Accessory Structures in Franklin County, OH (2026)
2 county-level rules, plus city-specific rules for 1 city in Franklin County, Ohio.
Verified from official government sources
ADU Rules
Rural District homeowners can add an 816-square-foot accessory apartment inside the main house or attached garage, with Board of Zoning Appeals design approval and extra lot size and parking required.
Franklin County Accessory Apartment Granny Flat Rules
Significant RestrictionsFranklin County Zoning Resolution § 302.039
302.039 - Accessory Apartment (Granny Flat) - An accessory apartment, as an independent dwelling unit, may be permitted, provided it meets the following conditions: The apartment must be located in the principal structure (which includes attached garages or areas over garages). Maximum size of the apartment dwelling unit shall not exceed 816 square feet. The structure must maintain a sing...
Shed & Carport Rules
Franklin County zoning caps residential lots at two accessory buildings and sets size, setback, and height by lot size, from 720 sq ft on sub-acre lots up to 4,320 sq ft on 5+ acres.
Franklin County Accessory Building Size Limits
Some RestrictionsFranklin County Zoning Resolution § 512.02
Unless otherwise permitted by this Zoning Resolution, a lot zoned Rural, Residential or being utilized for residential purposes as listed in Section 201, Article II, shall contain no more than two (2) accessory buildings. Accessory building development standards shall be based upon the following table and requirements: Table of Accessory Building Development Standards Lot size Set-back fr...
Accessory Structures by City in Franklin County
1 cities in Franklin County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
All Franklin County ordinances
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