In unincorporated Pennington County, Minnesota, building permits are required for code-regulated work where the State Building Code is locally enforced; we could not confirm the enforcing authority1. Zoning varies by parcel, and Smiley Township requires its own zoning application for construction and specified changes23. Pennington SWCD handles county septic permits for installing, replacing or repairing systems4.
At a glance
- Building permit
- Required for code-regulated work where the state code is locally enforced; the unincorporated-area authority is unconfirmed51
- Zoning
- Varies by parcel; Smiley Township enforces zoning in its unincorporated area2
- Septic permits
- The county program reviews plans, approves permits and inspects new or replacement systems; Pennington SWCD provides the application674
- Shoreland permits
- Required for buildings, additions, septic changes and substantial grading or fill in shoreland areas8
- RV or tiny home
- Long-term RV and tiny-home rules remain unconfirmed; Smiley has dwelling-size rules and Town Board approval for manufactured or mobile homes91011
- Owner-builder
- A qualifying owner may build without a contractor license; permits and inspections still apply12
- County-road access
- Construction or changes within county right-of-way need the County Engineer's prior approval13
- Private well
- File the state notification and fee before drilling a water-supply well14
Who to call
Roads & driveways
Pennington County Highway Department (County Engineer's Office)
Approval for construction, driveways and culverts within Pennington County road right-of-way; online right-of-way, utility and oversize/overweight permit portal
250 125th Avenue NE, Thief River Falls, MN 56701
Septic permits
Pennington Soil and Water Conservation District (SSTS Program)
Septic permits for installing, replacing or repairing a system in Pennington County
201 Sherwood Ave S, Thief River Falls, MN 56701
Planning & zoning
Pennington Soil and Water Conservation District (Shoreland Program)
Shoreland permits and forms for buildings, additions, septic work, grading and filling
201 Sherwood Ave S, Thief River Falls, MN 56701
Also useful
Pennington County Auditor-Treasurer's Office
General county administration and secretary to the county board; a starting point when the applicable building or zoning authority is unclear
101 Main Ave N, Thief River Falls, MN 56701
Contact details are copied from each office’s official page and were checked against it on October 10, 2026.
Off-grid gear
Going off-grid in Pennington County means bringing your own water and power. The kit we’d start with:
- Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
- Power Bluetti Solar generators and home battery backup for living off the grid.
- Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
- Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.
These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.
Do you need a building permit in Pennington County, Minnesota?
The Minnesota State Building Code is the statewide construction standard, including in Pennington County, but local enforcement depends on adoption; we could not confirm the enforcing authority for unincorporated land155. Where enforced, code-regulated construction, alterations, demolition, occupancy changes and building systems require a building permit before work begins1. A building permit triggers on-site compliance inspections, and covered buildings require a certificate of occupancy before use1617. Agricultural buildings on agricultural land are exempt from the code and its building permit and fee, subject to specified state exceptions18. Temporary buildings and manufactured-home installations require building permits where the code is enforced195.
Who issues building permits in Pennington County?
We could not confirm a dedicated Pennington County building department or local building official; start with the Auditor-Treasurer’s Office at 218-683-7000 to identify the authority for unincorporated land11. In Smiley Township, submit a signed Zoning Permit Application and site plan to the Town Clerk before new structures, additions, moves, footprint changes or specified use changes3. Pennington SWCD remains the contact for county septic permits and shoreland permits48. Smiley’s published zoning fees are $150 for a new home or business and $75 for other uses, subject to Town Board amendment; a conditional-use application costs $5002021. We could not confirm a county building-permit fee schedule; request one from the applicable building official2211.
Does Pennington County have zoning?
Pennington County zoning varies by parcel: Smiley Township zones its unincorporated area, and Thief River Falls administers city zoning inside city limits22324. Pennington SWCD is the county septic contact; Thief River Falls also requires a permit for sewage-treatment installation or alteration425. Smiley’s Town Clerk maintains the zoning map; districts include Agricultural Residential and Suburban Residential, so identify the parcel’s district before designing a home26. Agricultural Residential generally requires 4 acres per dwelling, as does non-platted Suburban Residential; platted Suburban Residential minimums are 9,000 square feet for a one-family lot and 12,000 for a two-family lot27. Smiley setbacks vary by district, lot type and road classification28. Shoreland permits apply separately, and the SWCD directs owners in Rocksbury, North, Norden, Sanders and Numedal Townships to their township clerks for other required permits8. County-administered zoning elsewhere remains unconfirmed; ask the Auditor-Treasurer’s Office who serves the parcel2911.
How do septic permits work in Pennington County?
Pennington County administers a septic program that reviews plans, approves permits and inspects new and replacement systems; Pennington SWCD states that county septic permits are required to install, replace or repair a system and provides the application674. New and replacement systems must be inspected, but we could not confirm Pennington County's inspection stages or whether a property transfer triggers a compliance inspection30. Pennington County's soil mapping shows 0% of soils without severe limitations for a conventional drain field, so arrange a site evaluation before fixing the house location or purchase budget31. In a shoreland area, the county requires a compliant septic system before issuing the shoreland permit8. Cities and townships may impose septic ordinances at least as stringent as the county's6.
Can you live in an RV or tiny home in Pennington County?
We could not confirm a Pennington County rule allowing or prohibiting long-term occupancy of a single RV or tiny home, so get a parcel-specific answer from the applicable county or township authority before moving one onto the land2911. Smiley’s Agricultural Residential and non-platted Suburban Residential dwelling minimum is 900 square feet per unit; platted Suburban Residential requires 1,100 for a one-family dwelling and 950 per unit for a two-family dwelling, which limits small-home options in those districts9. Smiley allows manufactured or mobile homes in its Agricultural Residential district only when they meet state requirements and receive Town Board approval10. A tiny home still needs a legal sanitation plan, and shoreland construction may require a separate county permit328.
What are the steps to build in Pennington County?
- Ask the Auditor-Treasurer's Office which building authority serves the parcel and whether the Minnesota State Building Code is locally enforced115.
- Identify the parcel's zoning authority; Smiley Township enforces its own ordinance, and ask the township clerk in Rocksbury, North, Norden, Sanders or Numedal about other required permits28. In Smiley, confirm the applicable lot size, setbacks, dwelling size and current zoning permit fee before design2728920.
- Have Pennington SWCD review the septic site and submit the required septic permit application before fixing the house location6731.
- Obtain any required SWCD shoreland permit and ask which floodplain requirements apply before choosing a building site833.
- File the required state notification and fee before a contractor drills a water-supply well14.
- Secure County Engineer approval before changing a driveway, culvert or other work inside county road right-of-way13.
- Complete required inspections and obtain the certificate of occupancy before using a covered building1617.
What should you check before buying land in Pennington County?
Start with wastewater: Pennington County maps 0% of its soils as free of severe limits for a conventional septic drain field, so make an acceptable septic design or contingency part of the purchase decision31. Most land is gentle, with 99.6% at a slope of 15% or less, but flat ground does not eliminate drainage, wet-soil or floodplain concerns34. Verify legal access and ask the County Engineer whether a driveway or culvert would enter county right-of-way13. Confirm shoreland and floodplain status before choosing a building site; structures governed by the county floodplain ordinance must meet state and local requirements833. Budget separately for a private well and file the state notification before drilling14. Finally, identify the parcel's zoning authority: Smiley has specific lot, setback and dwelling-size standards, but countywide rules and long-term RV occupancy remain unconfirmed272892911.
Watch-outs
- Pennington County's local State Building Code enforcement authority could not be confirmed; ask the Auditor-Treasurer's Office who has jurisdiction before beginning code-regulated work511.
- Smiley Township enforces parcel-specific lot, setback and dwelling-size rules, but county-administered districts elsewhere could not be confirmed22728929.
- Shoreland construction has a separate permit path, and a compliant septic system is required before the shoreland permit is issued8.
- Pennington County maps 0% of soils as free of severe limits for a conventional septic drain field, so obtain a site evaluation early31.
Sources
- Overview of the Minnesota State Building Code, quoted and re-checked
- Smiley Township Zoning Ordinance, quoted and re-checked
- Smiley Township: Smiley Township Zoning Ordinance (Pennington County), quoted and re-checked
- Pennington Soil and Water Conservation District (SSTS Program) (penningtonswcd.org)
- Minnesota Statutes section 326B.121, quoted and re-checked
- Local septic system programs, quoted and re-checked
- Local septic system programs, quoted and re-checked
- Pennington Soil and Water Conservation District (Shoreland Program) (penningtonswcd.org)
- Smiley Township Zoning Ordinance, quoted and re-checked
- Smiley Township Zoning Ordinance, quoted and re-checked
- Pennington County Auditor-Treasurer's Office (co.pennington.mn.us)
- Minnesota Statutes § 326B.805 — Exemptions, quoted and re-checked
- Pennington County Highway Department (County Engineer's Office) (co.pennington.mn.us)
- Constructing a New Water-Supply Well in Minnesota, quoted and re-checked
- Minnesota Statutes § 326B.121 — State Building Code; Application and Enforcement, quoted and re-checked
- Code Adoption Guide, quoted and re-checked
- Minnesota Rules 1300.0220 — Certificate of Occupancy, quoted and re-checked
- Minnesota Statutes § 326B.121 — State Building Code; Application and Enforcement, quoted and re-checked
- Minnesota Statutes § 326B.121 — State Building Code; Application and Enforcement, quoted and re-checked
- Smiley Township Zoning Ordinance, quoted and re-checked
- Smiley Township Zoning Ordinance, quoted and re-checked
- Minnesota State Building Code Adoption Guide (Minnesota statewide rule), quoted and re-checked
- Smiley Township: Smiley Township Zoning Ordinance (Pennington County), quoted and re-checked
- Thief River Falls: official source (Pennington County), quoted and re-checked
- Thief River Falls: Chapter 152 zoning code, Sec. 152.112 (Pennington County), quoted and re-checked
- Zoning – Smiley Township, quoted and re-checked
- Smiley Township Zoning Ordinance, quoted and re-checked
- Smiley Township Zoning Ordinance, quoted and re-checked
- (2026 county census)
- Local septic system programs, quoted and re-checked
- Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
- Minnesota Administrative Rules, part 7080.2450 Maintenance (Minnesota statewide rule), quoted and re-checked
- Pennington County Board minutes, February 23, 2021, quoted and re-checked
- Share of land at 15% slope or less: Bolthole Index county data
Written October 10, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.