Bolthole Index

Morton County, North Dakota

Zoning, building permits and septic rules in Mandan, North Dakota

Mandan, North Dakota zones land inside city limits under its own ordinance, and the city's Building Inspection department issues building permits and inspects the work12. Morton County's rules cover only land outside the city3. We could not confirm who permits septic systems inside Mandan; Western Plains Public Health handles septic permits for Morton County4.

At a glance

Zoning
Yes, the City of Mandan zones land inside city limits1
Building permit
Issued by the city's Building Inspection department2
Certificate of occupancy
Required for new or changed buildings and uses5
Accessory dwelling
One per lot, owner must live on the property, in districts that list it6
Septic
Not confirmed inside the city; Western Plains Public Health serves Morton County4
Property tax
Morton County's effective rate is about 1%7

Who to call

Building permits

City of Mandan Building Inspection

Building permits inside Mandan city limits, building-code inspections, and guidance on zoning, lot coverage and allowed uses for a parcel

701-667-3230

205 Second Avenue NW, Mandan, ND 58554

Septic permits

Western Plains Public Health

Onsite septic permit applications and environmental-health questions for Morton County

701.667.3370

eh@westernplainsph.org

403 Burlington St SE, Mandan, ND 58554

Online permits →

Contact details are copied from each office’s official page and were checked against it on October 24, 2026.

Off-grid gear

Going off-grid in Mandan means bringing your own water and power. The kit we’d start with:

These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.

Does Mandan, ND have zoning?

Yes. Mandan's zoning ordinance divides the city into districts1, and the district boundaries are shown on the official zoning map, which is on file with the city planner or engineer8. Look up your parcel's district before you plan anything, because the numbers change from one district to the next.

A few examples from the ordinance. In the R7 Residential District, the minimum lot area is 7,000 square feet9, and buildings may cover up to 40 percent of the lot while impervious surfaces may cover up to 20 percent10. In the R3.2 Residential District, setbacks are 20 feet in front, 5 feet on the sides and 20 feet in the rear11. In the R4 Residential District, residential buildings are limited to 40 feet and accessory buildings to 25 feet12. These are district standards, not citywide limits.

Can you build an accessory dwelling unit in Mandan?

Possibly. Mandan allows an accessory dwelling unit (ADU) where the use is listed as accessory or conditional in the district6. Only one ADU is permitted on a lot or parcel, and the owner must live in the main house or the ADU for more than six months of the year6.

The unit may not exceed 40 percent of the main dwelling's habitable floor area or 800 square feet6. New units must also meet building codes and the district's setback, lot-coverage and height rules6. Confirm that your district lists the use before you draw plans.

Do you need a building permit in Mandan, and who issues it?

Inside Mandan, the City's Building Inspection department issues building permits and inspects the work for compliance with the building code213. The same office gives guidance on zoning, lot coverage and allowed uses for a specific parcel13. Call 701-667-323013.

A building or premises that is erected, changed, converted, moved, altered or enlarged also needs a certificate of occupancy from the building official before it is used5. We could not confirm the exact threshold that separates work needing a permit from minor work, so ask Building Inspection before starting any project.

The Morton County Building Inspector's permit rules apply to unincorporated land, not to addresses inside city limits14.

How do septic permits work inside Mandan, ND?

We could not confirm who permits onsite septic systems for lots inside Mandan city limits, or whether a city lot must connect to city sewer. Ask Building Inspection whether sewer is available at your address13.

The statewide rule is that anyone installing an onsite wastewater system needs a state license and a permit from the local public health unit before work begins15. In Morton County, that unit is Western Plains Public Health416. Its phone is 701.667.337016. Septic permits are a separate approval from the city's building permit.

Can you live in an RV or tiny home in Mandan?

We could not confirm a Mandan rule on living in an RV, camping on private land or placing a tiny home inside city limits. Do not assume it is allowed. Ask Building Inspection at 701-667-323013 for the answer for your district before you buy.

County rules do not answer this question for a city lot. Outside the city, Morton County allows a recreational vehicle camp only in certain districts and only with a special use permit17.

Building a home in Mandan: the steps, in order

  1. Find the parcel's zoning district on the official zoning map and confirm the use you want is allowed there8.
  2. Ask City of Mandan Building Inspection about lot, setback and coverage limits for that district13.
  3. Confirm sewer or septic. If the lot is not on city sewer, contact Western Plains Public Health about a septic permit1516.
  4. Apply to Building Inspection for the building permit2.
  5. Have the work inspected for compliance with the building code2.
  6. Get the certificate of occupancy from the building official before anyone moves in5.

What stays with Morton County, and what to check before you buy

Land outside Mandan is a different question. The Morton County Land Use Code governs zoning in unincorporated areas and does not apply in the extraterritorial areas of cities3. If a parcel sits just beyond city limits, ask both the city and the county which one regulates it. Our Morton County page covers unincorporated land.

Before buying a lot, also ask Building Inspection about floodplain mapping and any floodplain permit for the address. Property taxes are county-level data: Morton County's effective property tax rate is about 1%7.

Watch-outs

  • We could not confirm which edition of the building code Mandan enforces; ask City of Mandan Building Inspection, since a city that enforces a building code must adopt the state building code1813.
  • North Dakota's builder property-tax exemption works only where the city or county has passed a resolution, and for property inside a city the city has jurisdiction19. We could not confirm whether Mandan has passed one; ask the city.
  • We could not confirm a minimum dwelling size, a short-term rental rule or a private-well rule for lots inside Mandan; ask Building Inspection before you buy13.

Sources

  1. Mandan Code of Ordinances, Chapter 101 – Zoning Ordinance (Mandan), quoted and re-checked
  2. Building Inspection - Mandan, ND (Mandan), quoted and re-checked
  3. Land Use Code - Morton County, North Dakota, quoted and re-checked
  4. Building a Home in Morton County, quoted and re-checked
  5. Mandan Code of Ordinances, Chapter 101 – Zoning Ordinance (Mandan), quoted and re-checked
  6. Mandan Code of Ordinances, Chapter 101 – Zoning Ordinance (Mandan), quoted and re-checked
  7. Effective property tax rate: Bolthole Index county data
  8. Mandan Code of Ordinances, Chapter 101 – Zoning Ordinance (Mandan), quoted and re-checked
  9. Mandan Code of Ordinances, Chapter 101 – Zoning Ordinance (Mandan), quoted and re-checked
  10. Mandan Code of Ordinances, Chapter 101 – Zoning Ordinance (Mandan), quoted and re-checked
  11. Mandan Code of Ordinances, Chapter 101 – Zoning Ordinance (Mandan), quoted and re-checked
  12. Mandan Code of Ordinances, Chapter 101 – Zoning Ordinance (Mandan), quoted and re-checked
  13. City of Mandan Building Inspection (cityofmandan.com)
  14. Building Inspector, quoted and re-checked
  15. On-Site Wastewater Treatment Systems (North Dakota statewide rule), quoted and re-checked
  16. Western Plains Public Health (westernplainsph.org)
  17. Morton County Land Use Code, quoted and re-checked
  18. Building Codes | Commerce | North Dakota (North Dakota statewide rule), quoted and re-checked
  19. Property Tax Exemption for Builders of Certain New Single Family Residential Properties (North Dakota statewide rule), quoted and re-checked

Written October 24, 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.

Answers from the rulebook for Mandan

Mandan’s own rules

  • InspectionsRequired

    Work for which Mandan issues a building permit inside city limits.

    • The City describes inspections as compliance inspections for building-code work.
    “Issuing building permits and inspecting such work for compliance with building code.”
  • Certificate of occupancyRequired

    Buildings or premises changed, converted, moved, altered, or enlarged in use or structure inside Mandan city limits.

    • The certificate must be issued by the building official and show conformity with Chapter 101.
    “It is unlawful to use or permit the use of any building or premises or part, hereafter created, erected, changed, converted, moved, altered or enlarged wholly, or partly in its use or structure, until a certificate of occupancy shall have been issued therefor by the building official.”
  • Local zoningPresent (with conditions)

    Land inside Mandan city limits.

    • The ordinance divides the city into zoning districts.
    “For the purposes of these regulations, the city is divided into districts.”
  • Zoning districtsPublished (with conditions)

    Zoning districts inside Mandan city limits.

    • District boundaries are shown on the official zoning map on file with the city planner or engineer.
    “The location and boundaries of districts established in the city are shown on the official zoning map of the city.”
  • Minimum lot sizeSpecified

    Lots in Mandan's R7 Residential District.

    • This is the R7 district standard, not a citywide minimum.

    minimum lot area: >= 7000 square feet

    “d) Lot area. The minimum lot area shall be 7,000 square feet.”
  • SetbacksSpecified

    Lots in Mandan's R3.2 Residential District.

    • For duplex dwellings with each unit on its own lot, no side setback is required for the common wall.
    • A garage door facing a public street, alley, or private access easement must be at least 25 feet from the property line or access easement.
    • For corner lots, the front-yard requirement applies to all yards abutting a street under Sec. 101-7-3(a).

    front setback: 20 feet · side setback: 5 feet (No side setback for a common wall of qualifying separately-lotted duplex units.) · rear setback: 20 feet

    “i) Front: 20 feet ii) Side: 5 feet (1) For duplex dwellings where each unit is constructed on its own lot, no side is required for the common wall. iii) Rear: 20 feet”
  • Lot coverageSpecified

    Lots in Mandan's R7 Residential District.

    • This is the R7 district standard, not a citywide limit.

    maximum building lot coverage: <= 40 percent · maximum impervious-surface coverage: <= 20 percent

    “c) Lot coverage. Max building lot coverage shall not exceed 40 percent of the square foot area of the lot. Max impervious surfaces coverage shall not exceed 20 percent of the square foot area of the lot.”
  • Building heightSpecified

    Buildings in Mandan's R4 Residential District.

    • Residential buildings have a 40-foot limit; other permitted-use buildings have a 50-foot limit; accessory buildings have a 25-foot limit.

    residential building height: <= 40 feet · other permitted-use building height: <= 50 feet · accessory building height: <= 25 feet

    “f) Building height. Residential building height shall be limited to 40 feet. No building for any other permitted use shall exceed fifty (50) feet in height. Accessory buildings shall not exceed 25 feet.”
  • Accessory dwellingsAllowed (with conditions)

    Accessory dwelling units inside Mandan city limits where the use is listed as accessory or conditional in the applicable district.

    • The use must be listed as an accessory or conditional use in the district.
    • No more than one ADU is permitted on a lot or parcel.
    • The owner must occupy the primary or accessory dwelling unit as a legal residence more than six months in a given year.
    • ADU floor area may not exceed 40 percent of the principal dwelling's habitable floor area or 800 square feet.
    • New units must comply with all building codes and applicable setback, lot-coverage, and height requirements.

    maximum ADU floor area relative to principal dwelling: <= 40 percent · maximum ADU floor area: <= 800 square feet

    “No more than one accessory dwelling unit may be permitted on a lot or parcel.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Mandan or Morton County directly.

  • Building permit — Residential construction inside Mandan city limits.
  • Owner-builder exemption — Owner-built residences inside Mandan city limits.
  • Building code adopted — Building-code adoption for construction inside Mandan city limits.
  • Minimum dwelling size — Dwellings inside Mandan city limits.
  • Living in an RV — Long-term RV occupancy on private land inside Mandan city limits.
13 more unanswered
  • Camping on your land
  • Tiny homes
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Subdividing land
  • Driveway access
  • Building in a floodplain
  • Short-term rentals

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Unanswered questions are usually a sign that Mandan publishes no rule on the point, not that none exists. Morton County’s page lists the county offices to call.

← All of Morton County: county rules, score and offices