St. Louis County, MN Accessory Structures: Tiny Homes (2026)
Tiny home rules in St. Louis County, MN, covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds, determine where they are legal and how they get permitted.
Key Facts
- Zoning status
- counts as Principal Dwelling, Single-family
- Permit needed
- Land Use Permit (Residential Use Class I)
- Sewage requirement
- approved on-site system, Sec. 2.4(H)
- Height cap applies
- 35 ft, Residential/Shoreland areas
- Permit expires
- if work not begun in 24 months
Summary
St. Louis County's zoning ordinance names tiny homes directly: a detached tiny home qualifies as a Principal Dwelling, Single-family the same as a stick-built house, mobile home or manufactured home, provided it has an approved sewage treatment system and a Land Use Permit.
Principal Dwelling, Single-family - A detached residence, may include a mobile or manufactured home or tiny home, designed for one family only and having an approved sewage treatment system. S. ... Residential Use– Class I – A category of uses that includes but is not limited to: hunting shacks, residential dwellings (less than five units or sites), seasonal residences and accessory dwellings and accessory structures for personal use. 2. ... Allowed – Land Use Permit Required: a. Residential Use – Class I
Full Breakdown
7. That single line puts a tiny home on equal footing with any other single-family house for zoning purposes rather than treating it as a recreational vehicle or accessory structure. Because it counts as a residential dwelling, a tiny home falls under "Residential Use - Class I," a category that also covers hunting shacks, seasonal residences and accessory dwellings for personal use. In the Forest Agricultural Management, Multiple Use and Shoreland Multiple Use districts, Residential Use Class I is "Allowed - Land Use Permit Required," meaning an owner must apply for and receive a land use permit from the Director before placing the tiny home, rather than needing a discretionary conditional use permit.
4(H), cannot be occupied until it is served by an approved on-site sewage treatment system. Construction or placement must substantially begin within 24 months of permit issuance or the permit becomes void, though the Director may grant a fee-paid extension if the proposal still meets ordinance requirements.
Violations & Fines
Occupying a tiny home without the required Land Use Permit, or without an approved sewage treatment system as Section 2.4(H) demands, is a zoning violation the Director can investigate and order corrected. Continued noncompliance is referred to the County Attorney, and a person who violates or knowingly helps circumvent the ordinance is guilty of a misdemeanor under Section 8.2, with fines paid into the county's general revenue fund; the County Board can also seek an injunction to halt occupancy.
Frequently Asked Questions
Are tiny homes legal in unincorporated St. Louis County, MN?
What permit does a tiny home need in St. Louis County?
Does a tiny home need a septic system to be occupied?
Sources & Official References
Other rules in St. Louis County
Compare St. Louis County to another location·View the Minnesota accessory structures overview
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