5 rules for unincorporated Butler County, Ohio.
Verified from official government sources
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.
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.
Butler County itself does not regulate backyard sheds. In unincorporated areas your township zoning resolution sets shed size, placement, and setback rules under ORC Ch. 519; incorporated cities apply their own code. A zoning permit is often required before you build.
Converting a garage into living space is not a county matter in Butler County. Your township (unincorporated) or city zoning code controls whether the conversion is allowed and whether a new dwelling unit is created. Ohio building-code permits also apply.
Butler County does not regulate carports. In unincorporated townships, ORC Ch. 519 zoning resolutions set carport placement, setbacks, and permit needs; incorporated cities apply their own code. A zoning certificate is usually required before installation.
Whether you can live in a tiny home in Butler County depends on your township or city, not the county. ORC Ch. 519 lets townships zone the unincorporated area, and Ohio's building/residential code sets minimum standards for permanent dwellings.
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Butler County Ordinance Hub →