1 county-level rule, plus city-specific rules for 1 city in Olmsted County, Minnesota.
Verified from official government sources
Olmsted County's zoning authority over unincorporated areas (and four contracting townships - Eyota, Marion, Oronoco, Quincy) operates under Minn. Stat. Ch. 394. The county's Chapter 1400 Zoning Ordinance permits accessory structures in the R-1 district at up to 1,000 sq ft, with separations of 6 ft from the house, 5 ft from side lot lines, and 8 ft from rear lot lines. Within the City of Rochester, ADUs are governed by the Unified Development Code Section 60.300.020G - one ADU per lot, max 1,000 sq ft, allowed in all residentially zoned districts since the UDC took effect January 1, 2023. Minnesota has no statewide ADU mandate; cities and counties retain local control.
1 cities in Olmsted County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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