Building permits in Cass County, North Dakota depend on the project and the township, city or other local jurisdiction: structural remodeling or expansion normally requires one, and substantial electrical, plumbing and mechanical work requires permits even without structural changes1. Contact the appropriate local jurisdiction before building because zoning also varies across Cass County2. Fargo Cass Public Health licenses and inspects septic systems and issues a use permit after approval3.
At a glance
- Building permit
- Depends on the project and local jurisdiction; structural changes normally require one1
- Zoning
- Varies by township or municipality; confirm the parcel's jurisdiction2
- Septic permit
- Licensed and inspected by Fargo Cass Public Health; use permit follows approval34
- Major subdivision
- Splitting into more than 4 buildable lots needs Planning Commission + County Commission approval5
- Minor subdivision
- Up to 4 buildable lots; needs a Planning Commission hearing5
- Owner-builder exemption
- Not confirmed by county sources6
- Well permit
- Required only above 12.5 acre-feet/year withdrawal7
- Manufactured home
- Needs a licensed installer and inspection before occupancy8
Who to call
Planning & zoning
Township zoning coordination, subdivision (plat) administration, floodplain administration, and building-permit application forms for unincorporated Cass County
1201 Main Ave. W., West Fargo, ND 58078
Septic permits
Licensing and inspection of on-site sewage treatment systems (septic) for Cass County and neighboring counties
1240 25th Street South, Fargo, ND 58103
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 Cass County, North Dakota?
The answer depends on the work and the township, city or other local jurisdiction. Structural remodeling or expansion in Cass County normally requires a building permit, and substantial electrical, plumbing and mechanical work requires permits even when no structural change is planned1. Smaller jobs such as roofing, siding, window replacement and some garden sheds may also require permits under local rules1. Contact the appropriate township, city or Cass County planner before starting development9. North Dakota's state building code took effect January 1, 2026, but state Community Services does not enforce it; enforcement belongs to jurisdictions that elect to adopt and enforce a code1011. Permit and plan-review fees are set by the applicable governing authority12.
Who is the Cass County building department, and how do you reach them?
Start with the Cass County Planning Office, which coordinates township zoning and reviews proposals against county subdivision, floodplain and highway-access rules5. The Planning Office is at 1201 Main Ave. W., West Fargo, ND 58078, and its phone number is (701) 298-23755. Office hours are Monday through Friday, 8 am to 5 pm5. The Planning Office can identify whether the township, city or county planner is the right first contact, because applicants must check with the applicable jurisdiction before development9. We could not confirm a single countywide building-inspection program or certificate-of-occupancy rule; ask the identified local permitting authority what inspections and closeout documents apply.
Does Cass County have zoning?
Zoning varies across Cass County townships and municipalities rather than coming from one confirmed countywide ordinance2. The Cass County Planning Office evaluates proposals against township zoning ordinances and directs applicants to the appropriate township or city before building25. North Dakota law allows a county commission to regulate land and buildings within the county, subject to the state building-code chapter and a comprehensive plan13. For a specific parcel, ask the Planning Office which jurisdiction controls and then obtain that jurisdiction's answer on setbacks, minimum lot size, building height, RV occupancy and tiny homes; countywide measurements or occupancy rules for those topics could not be confirmed.
How do septic permits work in Cass County?
Fargo Cass Public Health licenses and inspects the septic system for any Cass County home or small commercial building that discharges household wastewater, then issues the use permit after a successful inspection3. Give Fargo Cass Public Health 24-hour notice before requesting the inspection; inspectors examine the tank and drain field in an open trench, and the system must remain uncovered until approval4. Reach the office at 1240 25th Street South, Fargo, ND 58103, or 701.241.136014. The installer also needs a North Dakota Department of Environmental Quality license and the local public-health permit before beginning work15. Only about 16% of Cass County soils rate free of severe limits for a conventional drain field, so confirm the site and design before assuming a standard system will work16.
Can you live in an RV or tiny home on your land in Cass County?
We could not confirm a countywide rule for RV or tiny-home occupancy on private land in Cass County. Zoning varies by township and municipality, so ask the Cass County Planning Office to identify the jurisdiction for the parcel and then ask that jurisdiction what its ordinance allows25. North Dakota's limit of 14 nights in any 30-day period applies to state-park campsites and cabins, not private-land occupancy17. A new manufactured home used as a residence must be installed by a state-licensed installer and inspected by a state-licensed inspector8. Do not treat that manufactured-home rule as an answer for a site-built tiny home; the applicable local jurisdiction still needs to confirm zoning, size and occupancy requirements.
Building a home in Cass County: the steps, in order
- Call the Cass County Planning Office at (701) 298-2375 to identify the township, city or county authority for zoning and permits before development begins59.
- If you are splitting rural property, check with the Planning Office first because the county subdivision ordinance may apply5.
- Confirm whether the building scope needs local building, electrical, plumbing or mechanical permits; structural remodeling or expansion normally requires a building permit1.
- Obtain the local public-health septic permit before work starts, then give Fargo Cass Public Health 24-hour notice for the open-trench inspection and leave the system uncovered until approval154.
- Obtain a Cass County Highway Department permit for new or modified access to a county highway; use the Fargo NDDOT District Office for a state highway or the township or city for its roads18.
- If the site is in a special flood hazard area under Cass County jurisdiction, obtain the floodplain development permit before construction or development begins19.
- If a well will withdraw more than 12.5 acre-feet per year, obtain a state water-appropriation permit; smaller qualifying domestic wells must still be reported7.
What to check before you buy land in Cass County
Zoning: ask the Cass County Planning Office which township, city or county authority controls the parcel because local zoning varies across Cass County25. Soils: only about 16% of Cass County soils rate free of severe limits for a conventional septic drain field, so investigate the site before assuming a standard system will work16. Flood: development in a special flood hazard area under Cass County jurisdiction requires a permit before work begins19. Access: a new or modified entrance to a county highway requires a Cass County Highway Department permit, while state, township and city roads go to their respective authorities18. Taxes: Cass County's typical effective property tax rate is about 1.2%, with a median annual bill near $3,4492021.
Watch-outs
- Cass County permit and zoning answers depend on the project and the parcel's township, city or other jurisdiction; contact the appropriate local authority before development12.
- Give Fargo Cass Public Health 24-hour notice for the open-trench septic inspection, and do not cover the tank or drain field before approval4.
- Cass County's own sources don't confirm an owner-builder exemption; check directly with the Planning Office before assuming you can act as your own contractor6.
Sources
- Cass County Planning Office — Prospective Rural Developers and Homeowners, quoted and re-checked
- Cass County Planning Office — Prospective Rural Developers and Homeowners, quoted and re-checked
- On-site Sewage Treatment Systems, quoted and re-checked
- On-site Sewage Treatment Systems, quoted and re-checked
- Cass County Planning Office (casscountynd.gov)
- (2026 county census)
- Water Appropriation Permits (North Dakota statewide rule), quoted and re-checked
- Manufactured Home Installation Program (North Dakota statewide rule), quoted and re-checked
- Cass County Planning Office — Prospective Rural Developers and Homeowners, quoted and re-checked
- Building Codes | Commerce | North Dakota (North Dakota statewide rule), quoted and re-checked
- Building Codes (North Dakota statewide rule), quoted and re-checked
- 2026 North Dakota State Building Code Book (North Dakota statewide rule), quoted and re-checked
- North Dakota Century Code, Chapter 11-33, County Zoning (North Dakota statewide rule), quoted and re-checked
- Fargo Cass Public Health (fargond.gov)
- On-Site Wastewater Treatment Systems (North Dakota statewide rule), quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Parks and Recreation FAQ (North Dakota statewide rule), quoted and re-checked
- Cass County Planning Office — Prospective Rural Developers and Homeowners, quoted and re-checked
- Ordinance 2025-01 — Cass County Floodplain Development, quoted and re-checked
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
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.