Unincorporated Clay County, Minnesota requires a county building permit for buildings and additions, while its incorporated cities issue their own permits1. County zoning applies outside municipal limits, and township rules may also apply2. Clay County Environmental Health permits and inspects septic systems throughout the county3.
At a glance
- Building permit
- Required for buildings and additions on unincorporated land1
- Zoning
- County zoning applies outside municipalities; township rules may also apply2
- Septic permit
- New systems need a design, county permit and inspection before backfilling4
- RV use
- Limited to 2 highway-ready RVs on an individual lot of record5
- Owner-builder
- Eligible owners may build without a residential contractor license, but permits still apply6
- Permit process
- Township signature required; completed applications are processed within 10 days7
- Septic at sale
- Existing systems must be county-certified before ownership transfers8
Who to call
Building permits
Clay County Planning and Zoning Office (Building & Land Alteration Permits)
Building and land-alteration permits for construction, additions, and moving in manufactured/pre-fab/trailer homes, outside Clay County's 11 incorporated cities
3510 12th Ave. S., Moorhead, MN 56560
Planning & zoning
Land Development Ordinance administration, zoning and subdivision regulations for unincorporated Clay County
3510 12th Ave S, Moorhead, MN 56560
Septic permits
Clay County Environmental Health
Septic (SSTS) system permits, design review, inspections and certifications for Clay County
715 11th Street N., Moorhead, MN 56560
Contact details are copied from each office’s official page and were checked against it on September 29, 2026.
Do you need a building permit in Clay County, Minnesota?
Yes. Clay County Planning and Zoning requires a building permit for buildings and additions on unincorporated land, including decks, garages, porches, sheds, manufactured homes, prefabricated buildings and trailer homes1. Incorporated-city projects go to the relevant city instead1. Minnesota's State Building Code supplies the statewide standard for covered construction, but we could not confirm how the code is administered in unincorporated Clay County; ask Planning and Zoning what code review and inspections apply to the project9. An eligible owner who will occupy the property or retain it as a rental may personally build without a residential contractor license, but that licensing exemption does not waive permits or inspections6.
Who issues Clay County building permits, and how do you reach them?
Clay County Planning and Zoning handles county building and land-alteration permits at 3510 12th Ave. S. in Moorhead; the office phone is 218-299-501210. The application asks for parcel and applicant details, present use, relevant shoreland information, contractor and construction details, and a site sketch7. A township officer must sign the completed application before it returns to the Planning and Zoning Director, and the county says completed applications are processed within 10 days7. After approval, the county mails a zoning certificate for posting7. Construction must begin within 6 months and be substantially complete within 1 year or the permit expires1. County permit fees were not confirmed; ask the office for the current fee schedule before submitting.
Does Clay County have zoning?
Yes. Clay County zoning applies outside incorporated municipalities, and adopted township regulations may add requirements; where provisions conflict, the more restrictive one controls2. The county publishes base districts and overlays, including agricultural, commercial, shoreland, resource-protection, urban-expansion and flood-hazard classifications11. Lot coverage is not one countywide percentage: the maximum depends on the base district, development type and applicable shoreland impervious-surface rules12. Ask the Clay County Planning Office to identify the parcel's district and overlays before relying on a use, setback or building footprint213. Land division is regulated too: subdivisions outside applicable municipal extraterritorial jurisdictions must follow the county subdivision chapter and obtain required final approvals before a development permit is issued14.
How do septic permits work in Clay County?
Clay County Environmental Health issues septic permits and certifications and inspects rural and urban systems throughout Clay County3. Every new septic system needs a design, a county permit and an inspection before backfilling4. Existing septic systems must be certified by the county before an ownership transfer, and the seller is responsible for arranging that inspection8. A building-permit project in the Shoreland Zoning District, or a project that adds a bedroom, also triggers inspection and certification of the on-site system10. Site feasibility deserves early attention because only about 7.1% of Clay County soils are rated without severe limitations for a conventional drain field15. Have the septic design settled before assuming a parcel can support the proposed home or before fixing the house location.
Can you live in an RV or tiny home on your land in Clay County?
Clay County allows no more than 2 recreational vehicles on an individual lot of record in its unincorporated jurisdiction5. Each RV must have current highway-use licensing, remain highway-ready on wheels or an internal jacking system, use only quick-disconnect utilities and have no permanent structural additions; floodplain requirements still apply5. That rule establishes placement conditions, but it does not confirm that full-time occupancy is allowed, so ask the Planning Office whether the parcel's zoning district permits the intended living arrangement213. We could not confirm a specific Clay County tiny-home occupancy rule or a general minimum dwelling size. A manufactured home follows a clearer path: moving one onto unincorporated land requires a county permit, and a new manufactured home installed for occupancy needs the federal installation inspection required statewide116.
Building a home in Clay County: the steps, in order
- Ask the Clay County Planning Office to identify the parcel's base district, overlays and any township rules211.
- Establish a septic design with Clay County Environmental Health and obtain the required permit before installation4.
- Prepare the building and land-alteration application, including the site sketch and required project details, then obtain the township officer's signature7.
- Return the completed application to Planning and Zoning; the county says processing takes 10 days, after which an approved zoning certificate is mailed for posting7.
- Ask which building-code inspections apply, keep permitted work accessible where an inspection is required, and obtain approval before covering that work17.
- Start within 6 months and reach substantial completion within 1 year to avoid permit expiration1.
What should you check before buying land in Clay County?
Confirm the zoning district, overlays, township rules, permitted use, setbacks and lot-coverage standard with the Clay County Planning Office before making the purchase depend on a particular building plan212. If the parcel is being divided, determine whether county subdivision review or municipal extraterritorial rules apply before assuming a new lot can receive a development permit14. Treat septic as a feasibility item: only about 7.1% of county soils are rated without severe limitations for a conventional drain field, and an existing system must be county-certified before ownership transfers158. Check floodplain status because building a house, placing fill or installing a culvert or bridge in applicable floodplain areas requires a floodplain permit18. If new access to a public highway is needed, the road authority may require an access permit19.
Watch-outs
- A Clay County permit application needs a township-officer signature before county review, and the county's 10-day processing period applies to a completed application7.
- Existing septic systems must be county-certified before an ownership transfer, and the seller must arrange the inspection8.
- Clay County's 2-RV limit does not itself confirm full-time RV occupancy; ask Planning and Zoning about the parcel's district and intended use513.
Sources
- Building & Land Alteration Permit, quoted and re-checked
- Clay County Zoning, quoted and re-checked
- On-site Septic Systems, quoted and re-checked
- On-site Septic Systems, quoted and re-checked
- Clay County Land Development Ordinance: Zoning and Subdivision Regulations, quoted and re-checked
- Sec. 326B.805 MN Statutes (Minnesota statewide rule), quoted and re-checked
- Building & Land Alteration Permit, quoted and re-checked
- On-site Septic Systems, quoted and re-checked
- 2025 Minnesota Statutes, section 326B.121 (Minnesota statewide rule), quoted and re-checked
- Clay County Planning and Zoning Office (Building & Land Alteration Permits) (claycountymn.gov)
- Clay County Zoning, quoted and re-checked
- Clay County Land Development Ordinance: Zoning and Subdivision Regulations, quoted and re-checked
- Clay County Planning Office (claycountymn.gov)
- Clay County Land Development Ordinance: Zoning and Subdivision Regulations, quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Manufactured home information (Minnesota statewide rule), quoted and re-checked
- 1300.0210 INSPECTIONS (Minnesota statewide rule), quoted and re-checked
- Floodplain Regulations (Minnesota statewide rule), quoted and re-checked
- Minnesota Statutes, section 160.18: Access to roads; approaches (Minnesota statewide rule), quoted and re-checked
Written September 29, 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.