Straight answers
Are tiny homes legal in North Dakota?
Yes, and the state is unusual in how it gets there. North Dakota has a State Building Code, on the 2024 I-Codes since 1 January 2026, but no city, township or county is obliged to enforce it. A local government chooses whether to run a building code at all, and if it does, it must adopt the state code (NDCC 54-21.3-03(6)). The Department of Commerce publishes a directory of the jurisdictions that do, listing 12 counties and about 120 cities, and it says outright that the list is not exhaustive. One rule does not depend on that choice: a modular residential structure or a prebuilt home placed anywhere in the state must be built to the State Building Code, plus any amendments the receiving jurisdiction has made (54-21.3-03(7)). The tiny house appendix of the IRC is a separate matter, and North Dakota has not adopted it.
Figures verified against the sources below · October 12, 2026
01 — The longer answer
What the state sets, what your county chooses, and what follows the home
No jurisdiction has to enforce a building code
This is the fact that reorders every other answer in North Dakota. NDCC 54-21.3-03(6) says the governing body of a city, township or county that elects to administer and enforce a building code shall adopt and enforce the state building code, and may amend it to conform to local needs. The election is the whole mechanism. The Department of Commerce puts it plainly on its own building codes page: Community Services is not involved in enforcement, and that is the responsibility of jurisdictions that elect to adopt and enforce building codes. The administrative rule matches, applying the chapter to all cities, townships and counties that elect to adopt and enforce building codes. So a house can be built in North Dakota in a place where nobody inspects it, and that is not a loophole, it is the statute.
Which counties and cities do enforce one
The Department of Commerce publishes a Local Code Enforcement Directory, which is the closest thing to a direct answer. Its own heading dates it to 2022, so treat it as a starting point rather than a current roster. It lists 12 counties: Adams, Billings, Burleigh, Dunn, Grand Forks, Hettinger, McKenzie, Morton, Mountrail, Stark, Williams and Ward. It lists about 120 cities, among them Bismarck, Fargo, West Fargo, Grand Forks, Minot, Dickinson, Williston, Valley City and Devils Lake. The directory ends with the Department's own caution, which matters more than the list: jurisdictions not on it may have elected to adopt the State Building Code, and it advises contacting the local governing body to confirm. Ask the county or city before you rely on either answer.
North Dakota has not adopted the IRC tiny house appendix
Most states that move to the 2024 I-Codes inherit Appendix BB, the tiny house appendix, which is the provision that makes a loft, a ladder and a lower ceiling buildable to code. North Dakota does not. The administrative rule says the appendix chapters of the IBC, IRC, IMC and IFGC are not part of the state building code unless specifically adopted, and the 2026 State Building Code book carries the point as a heading of its own: NO APPENDICES ARE ADOPTED. The same page notes the State Building Code does not include the International Property Maintenance Code or the International Fire Code, and that each city, county or township must adopt those separately. A jurisdiction is free to adopt the tiny house appendix for itself, so it is worth asking, but nothing in the state code brings it in.
The one rule that travels with a factory-built home
NDCC 54-21.3-03(7) is the exception to everything above. A modular residential structure or a prebuilt home placed in the state must be constructed in compliance with the state building code, and where it is placed in a jurisdiction that has amended that code, it must comply with the amendments too. That duty attaches to the home, not to the jurisdiction, so it holds in a township that enforces nothing. The statute uses the phrase prebuilt home without defining it, which is worth knowing before anyone argues about what counts. For manufactured homes specifically, 54-21.3-03(5) makes the state building code the federal standards at 24 CFR 3280, and 54-21.3-08 requires an installation programme with a class A misdemeanour for breaching it.
How the factory gets inspected
North Dakota checks the factory rather than the finished home. Under NDCC 54-21.3-07 the manufacturer of a modular residential structure built in a factory must contract a third party to inspect it during manufacturing for compliance with the building, electrical, fire and plumbing codes, and where it does, no further inspection by state or local inspectors may be required during the factory stage. The section does not apply to a factory making fewer than two residential or commercial structures a year. The Department's third-party inspections page describes the programme in operation: a manufacturer producing two or more modular residential structures a year and intending to sell in North Dakota hires a third-party inspection entity certified by the Interstate Industrialized Building Commission, counting total production rather than units shipped to the state, and a manufacturer under that threshold files a yearly certification of exemption instead. Ask any manufacturer, ours included, which of those two routes it is on.
No state accessory dwelling unit law
North Dakota has not passed one. The statute books carry no ADU chapter, and the Legislative Council's subject indexes for the 2025 regular session list no accessory dwelling unit bill under housing or zoning. So whether you can put a second small home behind an existing house is decided entirely by the local zoning authority, and there are three of them: a city under NDCC 40-47-01, a county under 11-33-01, and a township under 58-03-11. Each may regulate the size of buildings and structures, and each is expressly subject to chapter 54-21.3. A city can also reach past its own boundary. Under 40-47-01.1 a city may extend its zoning to unincorporated territory by quarter quarter section, so rural land near a city is not automatically outside city rules.
Bismarck, as a worked example
Bismarck allows an accessory dwelling unit, but as a special use rather than by right, in its R5, R10, RM, RR, RR5 and A districts. The conditions in Title 14 are specific: one unit per lot; the owner must occupy the principal home or the unit as a legal residence for more than six months a year, the property may not be corporate-owned, and that duty binds later owners; one off-street parking space unless a parking plan is accepted; no more than one bedroom; and a floor area not greater than 800 square feet and not less than 300, rising to 1,200 square feet in an accessory structure on a lot over five acres. An accessory structure holding a unit may be up to 25 feet tall. The separate figure that catches small homes is in the definition of a single-family dwelling: it must sit on a permanent perimeter foundation and have a minimum width of 20 feet, a minimum depth of 20 feet and a minimum ceiling height of 7 feet 6 inches. A 20 foot minimum width rules out a road-width home on wheels, and rules out a single narrow module, as the principal house. These figures are from the City's own consolidation of Title 14; read the current text before designing to them.
On wheels: the 27 foot and utility-hookup test
North Dakota does not need your home to be long to call it a mobile home. Under NDCC 39-01-01(45), and in identical words at 57-55-01, a mobile home is a structure built on a permanent chassis, ordinarily designed for human living quarters, owned or used as a residence, which is either attached to utility services or 27 feet or more in length. Either limb is enough, so a short home on a chassis that is plugged into power or water is a mobile home in North Dakota whatever its length. That carries a duty: under 57-55-01.1 the owner must apply for a mobile home tax permit with the county director of tax equalization within ten days after the home is acquired, moved, or first brought into the state, and the permit is not issued until the tax is paid.
The four ways out of the mobile home tax
NDCC 57-55-10(2) is the clearest statement in North Dakota law of when a home on wheels stops being treated as a vehicle. The chapter does not apply to a home that is permanently attached to a foundation and assessed as real property, provided the owner also owns the land or holds a lease in recordable form running at least 20 years from execution with the lessor's consent. Nor to one that qualifies as a farm residence and is permanently attached to a foundation. Nor to one used only for temporary living quarters during recreational or vacation activities while displaying a current travel trailer licence. Nor to a park model trailer, and the statute defines that tightly: a recreational vehicle not over 40 feet long, built on a single chassis, mounted on wheels, with no more than 400 square feet of enclosed living space set up, certified by the manufacturer to ANSI A119.5, used only for seasonal or recreational living quarters and not as a primary residence, located in a trailer park or campground. Read together, the route to a home that is real property is a permanent foundation plus land you own or a 20 year recordable lease, and the park model route is closed to anyone wanting a primary residence.
What is exempt from the code entirely
Two exemptions in NDCC 54-21.3-04 come up constantly with small buildings, and only one is useful. Buildings that are neither heated nor cooled are exempt from the chapter, which covers a shed and does not cover a home anyone lives in through a North Dakota winter. A building used for agricultural purposes is exempt unless it is a place of human habitation or for use by the public, so the farm exemption stops exactly where a dwelling starts. A third provision is worth knowing for the oil patch: temporary work camp housing, defined at 54-21.3-02(8) as a modular residential structure housing workers for a maximum of five years, has its own regime at 54-21.3-04.3, including a five year limited certificate of inspection for previously used units and a duty to remove the housing within 120 days after it is vacated. None of that is a route to a permanent small home.
Living in one full time
The honest summary is that North Dakota puts almost nothing in your way at state level and almost everything in the hands of the jurisdiction. There is no state minimum house size, no state ADU rule and, outside the places that elected to run a code, no state inspection of how the house is built. What does follow you is narrow and firm: a factory-built home must be built to the State Building Code wherever it lands; a home on a chassis attached to utilities is a mobile home for tax purposes and needs a county permit within ten days; and becoming real property takes a permanent foundation plus ownership of the land or a long recordable lease. Winter does the rest of the arguing. Frost depth and ground snow load are not set statewide, they come from your jurisdiction through the IRC's climatic design table, so get those two numbers from the building department before anyone draws anything.
The national version of this question explains why the wheels-or-foundation split comes first in every state, and the North Dakota guide carries the code in force with the source for each figure.
03 — Sources
Each figure above links to the authority it came from.
NDCC 54-21.3-03: (4) neither the state building code nor a city, township or county code may require fire sprinklers in a single family dwelling or a residential building of no more than two dwelling units; (5) for manufactured homes the state building code consists of 24 CFR 3280; (6) the governing body of a city, township, or county that elects to administer and enforce a building code shall adopt and enforce the state building code, and may amend it to conform to local needs; (7) a modular residential structure or a prebuilt home placed in the state must be constructed in compliance with the state building code, and with the amendments adopted by a jurisdiction that has amended it
ndlegis.govNDCC 54-21.3-04: buildings which are neither heated nor cooled are exempt from the chapter; any building used for agricultural purposes is exempt unless a place of human habitation or for use by the public. 54-21.3-02(8) and 54-21.3-04.3: temporary work camp housing is a modular residential structure used to house workers for a maximum of five years, with a five year limited certificate of inspection for previously used housing and a duty to remove it within 120 days after it is vacated
ndlegis.govNDCC 54-21.3-05: a city or township may administer and enforce the state building code only within its jurisdictional area; a county may administer it in those areas not administered by a city or township. 54-21.3-07: the manufacturer of a modular residential or commercial structure built in a factory shall contract a third party to inspect it during manufacturing, and where it does no further inspection by state or local inspectors may be required during the factory process; the section does not apply to a factory manufacturing fewer than two residential or commercial structures per year. 54-21.3-08: a manufactured home installation programme, violation of which is a class A misdemeanor
ndlegis.govNorth Dakota Department of Commerce, Building Codes: Community Services is not involved in the enforcement of the State Building Code, which is the responsibility of jurisdictions that elect to adopt and enforce building codes; a jurisdiction that elects to do so must adopt the State Building Code but may further amend it; on 11 September 2025 eligible cities, counties and Building Code Advisory Committee members adopted the 2024 IBC, IRC, IMC and IFGC plus the 2024 IECC and IEBC, in effect 1 January 2026
commerce.nd.gov2026 North Dakota State Building Code book: NDAC 108-01-01-14, the appendix chapters of the IBC, IRC, IMC and IFGC are not part of the state building code unless specifically adopted, carried in the book under the heading NO APPENDICES ARE ADOPTED; the State Building Code does not include the International Property Maintenance Code or the International Fire Code, which must be adopted separately by each city, county or township; NDAC 108-01-01-04(2), the chapter applies to all cities, townships and counties that elect to adopt and enforce building codes
medialibrary.nd.govNorth Dakota Department of Commerce, Local Code Enforcement Directory, headed CODE ENFORCING JURISDICTIONS AS OF 2022: 12 counties listed (Adams, Billings, Burleigh, Dunn, Grand Forks, Hettinger, McKenzie, Morton, Mountrail, Stark, Williams, Ward) and about 120 cities; the Department's note states that jurisdictions not on the list may have elected to adopt the State Building Code and advises contacting the local governing body to confirm
commerce.nd.govNorth Dakota Department of Commerce, Third Party Inspection: manufacturers producing two or more modular residential structures per year and intending to sell in North Dakota hire a third-party inspection entity certified by the Interstate Industrialized Building Commission, counted on total production rather than units shipped to the state; manufacturers producing fewer than two per year submit a yearly certification of exemption
commerce.nd.govNDCC 39-01-01(45): a mobile home is a structure built on a permanent chassis, ordinarily designed for human living quarters, owned or used as a residence or place of business, which is either attached to utility services or twenty-seven feet or more in length. 39-01-01(42): a manufactured home is transportable in one or more sections, eight body feet or more wide or forty body feet or more long in the traveling mode, or 320 square feet or more when erected onsite, built on a permanent chassis and designed to be used as a dwelling with or without a permanent foundation
ndlegis.govNDCC 57-55-01 and 57-55-01.1: the same mobile home definition for tax purposes, and the owner of each mobile home shall file an application for a mobile home tax permit with the county director of tax equalization within ten days after the home is acquired, moved, or first brought into this state, with no permit issued until the tax is paid. 57-55-10(2): the chapter does not apply to a home used only for temporary living quarters during recreation or vacation displaying a current travel trailer licence; to a park model trailer not over forty feet, on a single chassis, on wheels, not over four hundred square feet of enclosed living space set up, certified to ANSI A119.5, used only for seasonal or recreational living quarters and not as a primary residence, in a trailer park or campground; to a farm residence permanently attached to a foundation; or to a home permanently attached to a foundation and assessed as real property where the owner owns the land or holds a lease in recordable form running at least twenty years from execution with the lessor's consent
ndlegis.govNDCC 40-47-01 (city), 11-33-01 and 11-33-03(3) (county) and 58-03-11 (township): each may regulate the height, number of stories and size of buildings and structures and the location and use of buildings, subject to chapter 54-21.3. NDCC 40-47-01.1: a city may by ordinance extend its zoning regulations to any quarter quarter section of unincorporated territory on the conditions stated there
ndlegis.govCity of Bismarck Code of Ordinances Title 14, section 14-03-08(4)(y): an accessory dwelling unit to a single-family dwelling is permitted as a special use in the R5, R10, RM, RR, RR5 and A districts; one per lot; the owner must occupy the principal or accessory unit as a legal residence more than six months a year and the requirement binds subsequent owners; at least one off-street parking space unless a parking plan is accepted; no more than one bedroom; floor area not greater than 800 and not less than 300 square feet, up to 1,200 square feet in an accessory structure on a lot greater than five acres; an accessory structure containing a unit may be up to 25 feet in height. Title 14 definition of Dwelling-Single-Family: a permanent perimeter foundation, a minimum width of twenty feet, a minimum depth of twenty feet and a minimum ceiling height of seven feet six inches
bismarcknd.govNorth Dakota Legislative Assembly, 69th Legislative Assembly (2025) subject indexes for Housing and for Zoning: no accessory dwelling unit or tiny home bill is listed
ndlegis.gov
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