Accessory Structures in Dayton, OH (2026)
2 verified accessory structures rules for Dayton, Ohio, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Dayton allows one accessory dwelling unit per single-family lot, sized up to 66% of the principal home, but it needs Conditional Use approval from the Board of Zoning Appeals before construction.
Dayton Accessory Dwelling Unit Size and Approval
Significant RestrictionsDayton R.C.G.O. § 150.305.5(D)(2); Conditional Use approval per § 150.305.3(A)
(2) Single family detached dwelling units are permitted one attached or detached accessory dwelling unit, which may be up to 66% of the total square footage of the principal dwelling. The footprint of a detached accessory dwelling unit shall not exceed 33% of that of the principal dwelling, nor shall it result in the property ...
Shed & Carport Rules
Before building a shed or any other accessory structure in Dayton, the zoning code requires a zoning certificate from the Zoning Administrator: there's no size-based exemption in the local text.
Dayton Requires a Zoning Certificate for Sheds
Some RestrictionsDayton R.C.G.O. § 150.135.1
The construction, building, moving, remodeling, or reconstruction of any building or structure shall not be commenced; ... the use of land, buildings or structures for temporary and accessory uses shall not be commenced; ... unless a zoning certificate shall first have been obtained from the Zoning Administrator.
Looking for Montgomery County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Dayton city rules.
Accessory Structures in Montgomery County →