ADU rules in St. Michael, MN — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
St. Michael's zoning code does not expressly permit accessory dwelling units (ADUs) in standard residential districts. Second residences require a conditional use permit and review against Chapter 155 zoning standards.
Chapter 155 (Zoning) defines permitted uses by district; the standard R-1 through R-5 single-family and townhome districts allow only one principal dwelling per lot. ADUs / 'mother-in-law' apartments are not listed as a permitted accessory use in the residential districts. Owners interested in a detached second dwelling must apply for a conditional use permit (CUP), and the city Planning Commission and City Council have discretion to deny. The city has opted out of certain state permissive housing statutes — Ordinance 1605 confirmed an opt-out of Minn. Stat. § 462.3593 (temporary health care dwellings). Title VII zoning amendments in 2024 left the single-dwelling rule in place. Owners should contact the Planning Department before any construction.
Adding an unpermitted second dwelling is a zoning misdemeanor under Sec. 10.99 — up to $1,000 / 90 days. The city may order the unit decommissioned and the kitchen or utility hookups removed.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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