ADU rules in Mishawaka, IN — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
St. Joseph County zoning permits an accessory dwelling unit, capping a detached ADU at 1,200 square feet and requiring it to sit behind the front building line with an Improvement Location Permit. Off public sewer it needs a septic construction permit under 410 IAC 6-8.3.
A detached accessory dwelling unit in unincorporated St. Joseph County is limited to 1,200 square feet or less than the primary dwelling's main floor area, must sit behind the established front building line, and needs an Improvement Location Permit before any site work. The unit is built and inspected to the 2020 Indiana Residential Code. Where the lot is not on public sewer, 410 IAC 6-8.3 requires a written construction permit signed by the county health officer before the onsite sewage system serving the ADU is built, and tank capacity is sized by bedroom count.
Building an ADU without the Improvement Location Permit is a zoning violation. Adding a dwelling on septic without the health officer's construction permit violates 410 IAC 6-8.3.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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