Arpit Jain 18 min March 22, 2026

Navigating North Dakota's Commercial Building Codes: A Guide for Design Professionals

Direct Answers to Your North Dakota Code Questions

The North Dakota State Building Code (NDSBC) adopts the 2021 International Building Code (IBC) as the primary standard for commercial construction. However, compliance requires understanding state-level amendments and, critically, local ordinances from jurisdictions like Fargo, Bismarck, and Grand Forks. For design professionals, navigating this hierarchy is key to a smooth permitting process.

Here are the essential takeaways for commercial projects in North Dakota:

• Governing Codes: North Dakota has a mandatory statewide building code based on the 2021 I-Codes (IBC, IFC, IMC, IECC, IEBC). Local jurisdictions adopt this code and may add more restrictive amendments, especially concerning climatic and geologic conditions like frost depth and snow loads.
• Mixed-Use Buildings: For a mixed-use building (e.g., R-2 apartments over M retail), the design must follow IBC Chapter 5. The primary requirements for occupancy separation, allowable height, and area are based directly on the 2021 IBC, as North Dakota has minimal state amendments to this chapter. Local zoning codes will have a significant impact, but the core life-safety separation requirements are driven by the IBC.
• Fire Protection Systems: Fire sprinkler and alarm system requirements are dictated by IBC Chapter 9. For example:
  • Group A-2 (Restaurant): An automatic sprinkler system is required when the occupant load is 100 or more or the fire area exceeds 5,000 sq. ft.
  • Group E (Educational): A sprinkler system is required in all Group E fire areas.
  • Fire Alarms: A manual fire alarm is triggered for Group A occupancies with an occupant load of 300 or more and is generally required for all Group E occupancies.
• Accessibility: North Dakota adopts IBC Chapter 11, which references the ICC A117.1-2017 standard for technical requirements. The state does not have significant amendments, making federal ADA and model code requirements the primary compliance path. This applies to new construction, alterations, and the path of travel to altered areas.
• Egress Sizing: Minimum egress widths for stairs and corridors are based on occupant load calculations from IBC Chapter 10. The absolute minimum is typically 44 inches for corridors and stairs in most commercial buildings, but this can be reduced to 36 inches for areas with an occupant load of less than 50.

Code Topic	Governing Standard (North Dakota)	Key Threshold / Requirement
Building Code	2021 International Building Code (IBC)	Statewide adoption with local amendments.
Fire Code	2021 International Fire Code (IFC)	Enforced by State Fire Marshal & local fire depts.
Accessibility	IBC 2021 Chapter 11 & ICC A117.1-2017	State follows model code closely.
Energy Code	2021 International Energy Conservation Code (IECC)	Mandatory for commercial and residential.
Electrical Code	2023 National Electrical Code (NEC)	Adopted by the ND State Electrical Board.
Plumbing Code	2021 Uniform Plumbing Code (UPC)	Note: ND uses the UPC, not the IPC.

Context: Why North Dakota's Code Landscape Matters

Understanding building codes in North Dakota is a game of layers. While the state provides a consistent foundation by adopting the International Codes, true compliance happens at the local level. The state establishes the minimum standard, but cities and counties have the authority to enact stricter requirements to address local conditions.

This framework is critical for several reasons:

• Climatic Extremes: North Dakota's harsh winters necessitate specific local amendments for frost depth (e.g., 60 inches in Fargo), snow loads, and energy conservation measures that often exceed the base model codes.
• Enforcement Hierarchy: Projects are reviewed and inspected by the local building department (the "Authority Having Jurisdiction" or AHJ). While the state code is the rulebook, the local official is the referee. Their interpretations and enforcement of local amendments are final.
• Project Coordination: Architects set the foundation for compliance by defining occupancy, construction type, and egress paths. This information flows directly to:
  • MEP Engineers: Who use occupant loads for ventilation (IMC) and plumbing fixture counts (UPC), and energy usage for IECC compliance.
  • Fire Protection Engineers: Who design sprinkler (NFPA 13) and alarm (NFPA 72) systems based on IBC Chapter 9 requirements.
  • Structural Engineers: Who design for locally amended snow, wind, and seismic loads.

A common pitfall is designing a project based solely on the IBC without verifying local amendments. A design that is perfectly compliant in one North Dakota city may be rejected in another due to a simple but critical difference in a local ordinance. Always start a project by contacting the local building department to confirm their adopted codes and specific amendments.

Detailed Answers to North Dakota Code Questions

For a new mixed-use building (e.g., R-2 over M occupancy) in Fargo, how do the local amendments and the North Dakota State Building Code modify IBC Chapter 5 requirements for allowable height, area, and occupancy separations compared to the base model code?

The design of a mixed-use building in Fargo is governed primarily by the 2021 IBC Chapter 5, as adopted by the North Dakota State Building Code (NDSBC). Both the state and the City of Fargo have very few direct amendments to the core provisions of IBC Chapter 5 regarding height, area, and occupancy separation, meaning the model code requirements are the primary standard.

The process for determining compliance involves these steps from the 2021 IBC:

1. Classify Occupancies: The building contains Group R-2 (Residential) and Group M (Mercantile) occupancies.
2. Determine Construction Type: The proposed construction type (e.g., Type I-A, III-A, V-A) must be established, as this is a fundamental variable.
3. Calculate Allowable Height and Area:
   • Using IBC Table 504.3 for allowable building height and Table 504.4 for number of stories, determine the maximums for the most restrictive occupancy (typically Group M in this scenario) based on construction type.
   • Using IBC Table 506.2, find the base tabular allowable area per floor.
   • Apply increases for frontage (IBC §506.3) and for the presence of an automatic sprinkler system (IBC §506.4). For a multi-story building, this increase can be 200% (Is = 2).
4. Address Mixed Occupancies (IBC §508):
   • The most common approach for this building type is the separated occupancy method (IBC §508.4).
   • Per IBC Table 508.4, the required fire-resistance rating for the horizontal separation between a Group R-2 and a Group M occupancy is 2 hours. If the building is equipped with an NFPA 13 sprinkler system, this can often be reduced to 1 hour, but the 2-hour separation is the default starting point.
   • Alternatively, the nonseparated occupancy method (IBC §508.3) can be used. In this case, the entire building must comply with the most restrictive allowable height, number of stories, and building area requirements for the involved occupancies, and no rated separation is required between them. This is often impractical for an R-2 over M configuration.

North Dakota and Fargo Amendments:

• NDSBC: The state-level amendments to the 2021 IBC are found in the North Dakota Administrative Code (N.D.A.C.) Article 45-03-01. These amendments do not significantly alter the core principles of IBC Chapter 5 for mixed-use buildings.
• Fargo Municipal Code: Article 21 of the Fargo Municipal Code contains local building code amendments. While it specifies local design criteria like a 60-inch frost depth and specific ground snow loads, it does not contain amendments that fundamentally change the IBC's methodology for calculating allowable area, height, or occupancy separations for a mixed-use building.

Therefore, for a project in Fargo, an architect or engineer would apply the 2021 IBC Chapter 5 requirements directly. The primary local influence will come from the Fargo Zoning Ordinance (Land Development Code), which will dictate permitted uses, maximum building height in feet (which may be more restrictive than the IBC's limits in stories), setbacks, and parking requirements, rather than the building code's life-safety provisions.

What are the mandatory fire protection system thresholds in North Dakota? Specifically, at what occupant load, building area, or height does the North Dakota State Building Code or Fire Code mandate the installation of an automatic fire sprinkler system and a fire alarm system for a Group A-2 (Restaurant) or Group E (Educational) occupancy?

In North Dakota, the mandatory thresholds for fire sprinkler and fire alarm systems are based on the 2021 IBC and 2021 IFC, as adopted by the state. The requirements are occupancy-specific and triggered by factors like occupant load, fire area size, and building height.

Automatic Fire Sprinkler System Requirements (IBC §903.2)

An automatic sprinkler system must be installed throughout buildings containing the following occupancies under these conditions:

Group A-2 (Assembly - Restaurants, Banquet Halls, etc.):

A sprinkler system is required where one of the following conditions exists, per IBC §903.2.1.2:

• The fire area exceeds 5,000 square feet.
• The fire area has an occupant load of 100 or more.
• The fire area is located on a floor other than a level of exit discharge.

Group E (Educational):

A sprinkler system is required throughout all buildings with a Group E fire area, per IBC §903.2.3.

• Exception: Sprinklers are not required in Group E fire areas if they are at the level of exit discharge and every classroom has at least one exterior exit door at ground level. This exception is rarely applicable to modern school designs.

Fire Alarm and Detection System Requirements (IBC §907.2)

A fire alarm system must be installed under these conditions:

Group A (Assembly):

A manual fire alarm system that activates the occupant notification system is required where the occupant load is 300 or more, per IBC §907.2.1.

• Additionally, assembly occupancies with an occupant load of 1,000 or more require an emergency voice/alarm communication system.
• Automatic smoke detection may be required in areas like stages or below-grade levels.

Group E (Educational):

A manual fire alarm system is required in Group E occupancies, per IBC §907.2.3.

• The system must include an emergency voice/alarm communication system where the occupant load is more than 30.
• The fire alarm system must be automatically activated by smoke detectors in corridors, rooms open to corridors, and other specified locations.

The North Dakota State Fire Marshal enforces the State Fire Code (2021 IFC), which mirrors these IBC requirements for new construction and also applies them to existing buildings under certain conditions.

Detail the accessibility requirements under the North Dakota State Building Code. Does the state adopt ANSI A117.1 by reference without amendment, and how do these requirements apply to employee-only work areas and alterations to existing buildings?

Yes, the North Dakota State Building Code adopts the accessibility requirements of the 2021 IBC Chapter 11 without significant state amendments. IBC Chapter 11, in turn, directly references the ICC A117.1-2017, Standard for Accessible and Usable Buildings and Facilities, for the detailed technical criteria for accessible routes, elements, and spaces.

Compliance in North Dakota therefore means satisfying the scoping requirements of IBC Chapter 11 and the technical requirements of ICC A117.1-2017, in addition to the federal requirements of the Americans with Disabilities Act (ADA).

Application to Employee Work Areas

Accessibility requirements for employee-only work areas are addressed in IBC §1103.2.2 and mirrored by the 2010 ADA Standards for Accessible Design §203.9. The key principles are:

• Accessible Circulation Paths: Common use circulation paths within employee work areas must be accessible. This ensures that a person with a disability can approach, enter, and exit the work area. This includes corridors, aisles, and other paths used by more than one employee.
• Individual Workstations: The individual workstations (e.g., a single cubicle, a kitchen prep station) are not required to be fully accessible from day one. However, the spaces must be designed to allow for future accessibility modifications.
• Exemptions: Areas where work cannot reasonably be performed by an individual with a mobility impairment (e.g., a narrow catwalk) or spaces that are very small (less than 300 sq. ft.) and elevated are exempt.

Application to Alterations in Existing Buildings

When altering an existing building, accessibility requirements are governed by the 2021 International Existing Building Code (IEBC), which North Dakota also adopts. The primary requirements are found in IEBC Chapter 5 (Prescriptive Compliance Method) and also apply under the other compliance paths.

• Altered Area: The altered portion of the facility must be made fully compliant with the accessibility requirements for new construction, to the maximum extent feasible (IEBC §502.1).
• Path of Travel: When an alteration affects an area containing a "primary function" (e.g., the main sales floor of a retail store, an office suite), an accessible path of travel to the altered area must also be provided. This path includes the main entrances, routes to the space, and the restrooms, drinking fountains, and public telephones serving the primary function area (IEBC §502.2).
• Disproportionate Cost (20% Rule): The cost of providing the accessible path of travel is capped at 20% of the total cost of the alteration to the primary function area. If the cost to make the path of travel fully compliant exceeds this 20% threshold, the owner must spend up to that amount to improve accessibility to the greatest extent possible.

What is the minimum required width for an egress stair and a corridor in a commercial building under the North Dakota code? Does this dimension change based on occupant load calculations?

Yes, the minimum required width for egress stairs and corridors under the North Dakota code (which follows the 2021 IBC) is directly dependent on the calculated occupant load of the area they serve. While there are absolute minimums, the final required width must be the greater of the calculated width or the prescribed minimum.

The calculation is based on IBC §1005.1:

Required Width = Occupant Load × Egress Width Factor

The egress width factors are found in IBC Table 1005.1:

• For Stairways:
  • 0.3 inches per occupant in buildings with a sprinkler system.
  • 0.2 inches per occupant in buildings with a sprinkler system and an emergency voice/alarm communication system.
• For Other Egress Components (Corridors, Ramps, Doors):
  • 0.2 inches per occupant in buildings with a sprinkler system.
  • 0.15 inches per occupant in buildings with a sprinkler system and an emergency voice/alarm communication system.

Minimum Corridor Width (IBC §1020.2)

The width of a corridor must be at least the dimension determined by the calculation above, but not less than the prescribed minimums:

• General Minimum: 44 inches.
• Occupant Load Less than 50: The minimum width can be reduced to 36 inches.
• Group E (Educational): Corridors in Group E used for student egress must be at least 72 inches in buildings with an occupant load of 100 or more.
• Group I-2 (Hospitals): Corridors in areas used for the movement of beds must be at least 96 inches.

Minimum Stairway Width (IBC §1011.2)

The width of a stairway must be at least the dimension determined by the calculation, but not less than the prescribed minimums:

• General Minimum: 44 inches.
• Occupant Load of 49 or Less: The minimum width can be reduced to 36 inches.
• Spiral Stairways: A minimum clear width of 26 inches is permitted as a component in a means of egress from a space not more than 250 sq. ft. in area and serving five or fewer occupants.

In practice, for most new commercial buildings in North Dakota (which will be sprinklered), the 44-inch minimum for corridors and stairs will govern unless the occupant load is very high. For example, a corridor serving 300 occupants in a sprinklered building would require a calculated width of 300 × 0.2 = 60 inches. Since 60 inches is greater than the 44-inch minimum, the corridor must be at least 60 inches wide.

Additional Supporting Sections

Jurisdictional Variations and Local Amendments

While the NDSBC provides a uniform baseline, design professionals must recognize that the final authority rests with the local building official. Major jurisdictions in North Dakota have specific amendments and administrative rules that impact project design and permitting.

• Fargo: Enforces specific frost depth (60 inches), ground snow load (42 psf), and wind speed requirements. Their plan review process is thorough, and early consultation is recommended for complex projects.
• Bismarck: Adopts the state code and has local amendments primarily related to administrative procedures, fees, and local conditions. Always check their Community Development Department for the latest requirements.
• Grand Forks & Minot: Similar to other large cities, they adopt the state code but maintain local amendments. It is critical to obtain the local design criteria (snow, wind, frost depth) directly from the city's building inspection department before beginning design.

Best Practice: Before starting schematic design, create a "Code Summary Sheet" for your project. On this sheet, list the governing codes (e.g., 2021 IBC), the adopting jurisdiction, and any specific local amendments you have verified with the city, such as:

• Frost Depth
• Ground Snow Load
• Wind Speed and Exposure Category
• Seismic Design Category
• Local Zoning Requirements (Height, Setbacks, Use)

Coordination Considerations for Permitting

Successful code compliance in North Dakota requires seamless coordination between architectural drawings and engineering disciplines.

• Architectural to MEP: The architect's occupant load calculations (IBC Chapter 10) are used by the mechanical engineer to determine required ventilation rates (IMC Chapter 4) and by the plumbing engineer for fixture counts (UPC Chapter 4). Energy code compliance (IECC) for lighting and envelope performance must be tightly coordinated.
• Architectural to Fire Protection: The occupancy classification, construction type, and fire-resistance ratings established by the architect on the life-safety plans are the basis for all fire sprinkler (NFPA 13) and fire alarm (NFPA 72) design. Any changes to a wall rating or room use must be immediately communicated.
• Structural to Architectural: The structural engineer will design for locally adopted snow, wind, and seismic loads. These structural systems (e.g., shear walls, braced frames) must be coordinated with the architectural plans to ensure they do not conflict with egress paths, accessibility clearances, or fire-rated assemblies.

The Plan Review and Permitting Process

In a typical North Dakota city, the permitting process follows these general steps:

1. Pre-Submittal Meeting (Optional but Recommended): For large or complex projects, meet with the city's plan reviewers to discuss code interpretations and unique project challenges.
2. Permit Application & Plan Submittal: Submit a complete set of construction documents (architectural, structural, MEP, fire protection, civil) along with the permit application and fees. Most jurisdictions now use a digital submission portal.
3. Departmental Review: Plans are routed to various departments for review, including:
   • Building (for IBC, IEBC, Accessibility, and Energy Code compliance)
   • Fire (for IFC and NFPA standards compliance)
   • Planning/Zoning (for land use, setbacks, and height compliance)
   • Public Works/Engineering (for site work, utilities, and stormwater)
4. Review Comments & Resubmittal: The city issues a list of comments or corrections. The design team addresses these comments and resubmits revised drawings.
5. Permit Issuance: Once all departments approve the plans, the building permit is issued.
6. Inspections: Construction is subject to a series of inspections (e.g., footing, framing, rough-in MEP, fire protection, final) to ensure work conforms to the approved plans.
7. Certificate of Occupancy: After a successful final inspection, a Certificate of Occupancy (CO) is issued, allowing the building to be legally occupied.

Frequently Asked Questions (FAQ)

1. Does North Dakota have a statewide building code? Yes. North Dakota has a mandatory statewide building code, the North Dakota State Building Code (NDSBC), which adopts the 2021 editions of the International Code Council's I-Codes, including the IBC and IRC.

2. What version of the IBC is North Dakota currently using? As of the latest adoption cycle, North Dakota uses the 2021 International Building Code (IBC).

3. What are the frost depth and snow load requirements in North Dakota? These are determined locally. For example, the City of Fargo specifies a minimum frost depth of 60 inches and a ground snow load of 42 psf. You must verify these values with the local building department for your project's specific location.

4. Are agricultural buildings exempt from the state building code? Yes, under North Dakota Century Code §18-12-04, buildings used exclusively for agricultural purposes on a farm are generally exempt from the state building code. However, they may still be subject to local zoning, setback, and electrical permit requirements.

5. What electrical and plumbing codes does North Dakota use? North Dakota adopts the 2023 National Electrical Code (NEC). For plumbing, the state is a Uniform Plumbing Code (UPC) state, adopting the 2021 UPC, not the International Plumbing Code (IPC).

6. How do I find the specific code amendments for a city like Bismarck or Minot? The best method is to visit the city's official website and navigate to the Building Inspection or Community Development department page. They typically publish their local ordinances and design criteria online. If not, a direct phone call to the department is the most reliable way to get accurate information.

7. Does the North Dakota building code apply to residential projects? Yes, the NDSBC adopts the 2021 International Residential Code (IRC) for the construction of one- and two-family dwellings and townhouses.

8. Are fire sprinklers required in all new commercial buildings? No, not all. Sprinklers are required based on specific thresholds in IBC Chapter 9, which relate to the building's occupancy group, size (fire area), occupant load, and height. Many smaller, single-story commercial buildings may not require a sprinkler system.

9. What energy code is enforced in North Dakota? North Dakota enforces the 2021 International Energy Conservation Code (IECC) for both commercial and residential buildings.

10. Do I need an architect or engineer to design a commercial building in North Dakota? Yes, per North Dakota Century Code Chapter 43-03, the design of public or private buildings must be performed by a registered architect or professional engineer, with some exceptions for very small or simple structures.