Garage conversion rules in St. Joseph County, IN — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Converting a garage to living space in St. Joseph County is a change of occupancy requiring a building permit under the 2020 Indiana Residential Code. The county Building Department reviews egress, ceiling height, insulation, and smoke and carbon-monoxide alarms.
A garage conversion turns non-habitable space into a habitable room, so the St. Joseph County Building Department permits it under the 2020 Indiana Residential Code, adopted by 675 IAC 14-4.4, and inspects egress windows, minimum ceiling height, insulation, and smoke and carbon-monoxide alarms; new wiring and plumbing draw their own permits. The converted space must still meet the zoning use and parking standards of the district. Where the work adds a bathroom or bedroom on a lot served by septic, 410 IAC 6-8.3 requires the county health officer to approve the added load, since tank size is set by bedroom count.
Converting a garage to habitable space without a permit is illegal construction subject to stop-work orders. Adding a bathroom on septic without health department approval violates 410 IAC 6-8.3.
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