Garage conversion rules in Montgomery County, OH — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Converting a garage to living space is a zoning and building matter handled by your Montgomery County city, village, or township, not the county. A permit and Ohio Residential Code compliance are required, and local zoning controls whether the new use is allowed.
Montgomery County has no countywide ordinance on garage conversions. Turning an attached or detached garage into habitable space (a bedroom, in-law suite, or ADU) is regulated by your municipality's or township's zoning code and the Ohio Residential Code, enforced by your local building department. Because a converted garage becomes habitable space, it must meet code standards for room size, ceiling height, light, ventilation, egress windows in sleeping rooms, and smoke and carbon-monoxide alarms. Local zoning separately controls whether a garage may be converted, whether required off-street parking must be preserved, and whether the unit counts as a permitted ADU. Townships derive this authority from ORC Chapter 519; cities and villages from their own charters and codes. A local building permit
An unpermitted garage conversion is a local zoning and building matter handled by your city, village, or township. Remedies include a stop-work order, a required retroactive permit, fines, or an order to restore the garage. The county does not enforce
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