ADU rules in Anoka County, MN — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Anoka County does not zone incorporated cities, so ADU rules are set by your city under Minn. Stat. 462.357. Minnesota has no statewide ADU mandate. In Blaine and Coon Rapids single-family districts, only one principal dwelling is allowed and detached accessory buildings cannot be used as living units.
Land-use authority in Minnesota is split: cities zone under Minn. Stat. Ch. 462, while the county zones only unincorporated townships under Ch. 394. Because nearly all Anoka County residents live in cities (Blaine, Coon Rapids, Andover, Ramsey), whether you may add an ADU depends on your city ordinance, not the county. Minnesota did not adopt a statewide ADU-legalization law, so allowances vary. Coon Rapids limits accessory structures to garage, storage, and similar uses and prohibits using them for a second dwelling in low-density (single-family) districts; two-family dwellings are permitted only where specifically zoned. Always confirm with your city planning division before designing an ADU.
Building an unpermitted second dwelling is a zoning violation; cities may order removal, deny occupancy, and cite the owner. Penalties are set by city ordinance, typically a misdemeanor.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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