Accessory Structures in Butler County, OH (2026)

1 rule for unincorporated Butler County, Ohio.

Verified from official government sources

Note: These county rules apply to unincorporated areas of Butler County. If you live within an incorporated city, that city's own rules apply: see the city list below.

ADU Rules

Butler County has no countywide zoning, so accessory dwelling units are governed by whichever township or city you live in. Ohio townships zone the unincorporated area under ORC Chapter 519; check your township's zoning resolution before adding an ADU.

ADU / granny-flat rules in unincorporated Butler County

Some Restrictions

ORC 519.02

the board of township trustees may regulate by resolution, in accordance with a comprehensive plan, the location, height, bulk, number of stories, and size of buildings and other structures... and the uses of land for trade, industry, residence, recreation, or other purposes in the unincorporated territory of the township.

Full ordinance details →Official source ↗

All Butler County ordinances

See every category we cover for Butler County: parking, noise, fences, fires, animals, pools, and more.

Butler County Ordinance Hub →