ADU rules in Butler County, OH — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
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.
Ohio law gives no county-wide zoning power to Butler County. Under ORC 519.02 the board of township trustees may 'regulate by resolution... the location, height, bulk, number of stories, and size of buildings and other structures... and the uses of land' in the unincorporated township. So whether a second dwelling, in-law suite, or garage apartment is permitted depends on your township's zoning resolution (e.g. West Chester, Liberty, Fairfield Twp) or your city's code (Hamilton, Middletown, Fairfield, Oxford). Contact your township zoning inspector or city zoning office for lot-size, setback, and owner-occupancy requirements before building.
Zoning enforcement is by the township zoning inspector or municipal zoning officer under ORC 519.99 / local code; typically a written violation notice, stop-work, and per-day fines until compliance.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Butler County, OH
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Butler County, OH
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Butler County, OH
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Butler County, OH
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Butler County, OH
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Butler County, OH
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See how Butler County's adu rules rules stack up against other locations.
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