In most Montana counties without building codes, you can build a single-family home without a structural building permit, plan review, or framing inspection, because state law exempts residences with fewer than five dwelling units from the state building code unless the local government has opted in to enforce it. Only six of Montana’s 56 counties have opted in. That said, “no building code” is not “no rules.” Electrical, plumbing, septic, water well, floodplain, energy conservation, and zoning requirements still apply, and lenders, insurers, and future buyers will have their own expectations about how your home was built.
Which Counties and Cities Actually Enforce Building Codes
The Montana Department of Labor and Industry keeps a current list of jurisdictions certified to enforce building codes. As of 2025, six counties have opted in at the county level: Deer Lodge, Missoula, Pondera, Richland, Silver Bow, and Toole.1Montana Department of Labor & Industry. Certified City, County and Town Programs If your land is in the unincorporated area of any of the other 50 counties, no local entity will require a structural building permit or inspect your foundation, framing, or roof.
City limits are a different story. Roughly three dozen cities and towns have certified their own programs, including Billings, Bozeman, Great Falls, Helena, Kalispell, Missoula, and Whitefish.1Montana Department of Labor & Industry. Certified City, County and Town Programs Inside those boundaries you will need a building permit, plan review, structural inspections, and a certificate of occupancy before moving in.2Montana Code Annotated. Montana Code 50-60-106 – Powers and Duties of Counties, Cities, and Towns
Before buying land or breaking ground, confirm whether your parcel sits inside a certified city or one of the six certified counties. Some cities also extend planning jurisdiction into surrounding unincorporated areas, and annexation can change the rules after you’ve started. A call to the county clerk, or a check of the DLI certified list, takes a few minutes.
Why No Structural Permit Is Required in Most of the State
The exemption comes from MCA 50-60-102. The state building code does not apply to residential buildings with fewer than five dwelling units, farm and ranch buildings of any size, or private garages and storage structures used only by the owner. That exemption runs everywhere in Montana, including inside cities and towns, unless the local government has formally opted in.3Montana State Legislature. Montana Code 50-60-102 – Applicability — Local Government Energy Conservation Standards
The statute also prohibits the state itself from enforcing the building code on these exempt structures. Only a county, city, or town that has adopted the code can enforce it within its own boundaries.3Montana State Legislature. Montana Code 50-60-102 – Applicability — Local Government Energy Conservation Standards The default across Montana is no building code for single-family homes.
Trade Permits That Apply Everywhere
Skipping structural permits is not the same as skipping all permits. Several trade-specific permits apply statewide, no matter where the property sits.
Electrical
Every electrical installation in Montana requires a permit, whether you’re in downtown Billings or on a ranch in Carter County.4Montana Department of Labor & Industry. Electrical Permits Wiring must meet the National Electrical Code, and a state electrical inspector will come out to verify compliance.5Cornell Law School. Mont. Admin. r. 24.301.431 – Electrical Permit
You can wire your own primary residence under a homeowner’s electrical permit, but only if the property is for your personal use. It cannot be built for resale or intended as a rental.5Cornell Law School. Mont. Admin. r. 24.301.431 – Electrical Permit All other electrical work must be done by a Montana-licensed electrician.
Fees for a new single-family home start at $200 for a service up to 200 amps, $380 for 201–400 amps, and $600 for 401–600 amps. Smaller jobs like adding a circuit or hooking up a well pump run $45 to $50.6Montana Department of Labor & Industry. Montana Electrical Permit Fee Schedule
Plumbing
Plumbing permits are issued by the Building Codes Bureau at the Department of Labor and Industry for anywhere not covered by a locally certified program.7Department of Labor & Industry. Plumbing Permits Anyone in the business of installing, altering, or repairing plumbing must have a permit, and failing to correct code violations found at inspection can lead to charges under MCA 50-60-110.8Cornell Law School. Mont. Admin. r. 24.301.371 – Plumbing Inspections
Penalty for Skipping
Knowingly doing electrical, plumbing, or other regulated work without the required permit is a misdemeanor.9Montana Legislative Branch. Montana Code 50-60-110 – Violation a Misdemeanor An inspector who finds unpermitted work can also require you to open walls or dig up plumbing so the installation can be examined. That rework cost usually dwarfs the original permit fee.
Septic, Water, and Site Approvals
Septic
A septic system permit from the county sanitarian or health department is required before installation begins. The sanitarian evaluates soil, groundwater depth, floodplain boundaries, and lot size to determine what type and size of system the property can support. An inspection is required before backfill. Fees vary by county and are commonly around $200.
Water Wells
Montana regulates private wells through the Department of Natural Resources and Conservation. A domestic well using 35 gallons per minute or less, and no more than 10 acre-feet per year, does not need a full water rights permit. Starting January 1, 2026, you must submit a Notice of Intent to Appropriate Groundwater to DNRC before putting the water to use.10Montana DNRC. Exceptions To Permit Requirements
After the well is complete and in use, you have 60 days to file a Notice of Completion with the filing fee. Your driller files a separate Well Log Report with the Montana Bureau of Mines and Geology within 60 days of drilling. From the date DNRC authorizes your Notice of Intent, you have five years to complete the water use and submit the Notice of Completion to receive an official water right.10Montana DNRC. Exceptions To Permit Requirements Miss these steps and you have no documented water right, which becomes a serious problem if a neighbor disputes your use or you try to sell.
Zoning, Floodplains, and Subdivision Review
The absence of a building code does not mean you can build anything, anywhere. Zoning and land-use rules operate independently.
Local Zoning
Even in counties without a building code, your county planning department may enforce setbacks from roads or property lines. Montana also allows property owners to petition county commissioners to create a planning and zoning district with its own land-use rules.11Montana State Legislature. Montana Code 76-2-101 – Planning and Zoning Commission and District A citizen-initiated district established by your neighbors before you bought the land still binds you, and you have only six months from the creation date to challenge how it was formed. Check for existing districts before you draw up plans.
Floodplains
Floodplain rules apply statewide and are one of the few land-use restrictions that can stop a rural project cold. Under Montana’s Floodplain and Floodway Management Act, building any structure in a designated floodplain without a permit from the local government or DNRC is illegal, and an unpermitted structure is classified as a public nuisance. If a local government fails to adopt qualifying floodplain regulations within six months of receiving flood data, the state enforces the standards directly.12Montana DNRC. Montana Code Title 76 Chapter 5 – Flood Plain and Floodway Management
Properties in a 100-year floodplain face strict requirements. Building in a floodway is essentially prohibited, and construction elsewhere in the floodplain requires a permit with detailed plans, profiles, and specifications. A violation can also disqualify the property from the National Flood Insurance Program, which most mortgage lenders require for flood-zone properties.
Subdividing Land
If you’re subdividing rather than building on an existing parcel, a separate layer of state review applies, with standards for roads, drainage, water supply, and sewage disposal.13Montana Legislature. Montana Code 76-3-504 – Subdivision Regulations — Contents Parcels under 20 acres must meet Department of Environmental Quality rules for water and wastewater. Subdivision review and the building code exemption coexist, but subdivision review itself is mandatory and can delay or reshape your project.
Energy Conservation Still Applies
Here is a point that catches people off guard. Even though the structural building code does not apply to your home, the energy conservation portions of the state building code do. MCA 50-60-102 carves out a specific requirement that residential buildings comply with the state’s energy conservation standards, with only farm and ranch buildings fully exempt.3Montana State Legislature. Montana Code 50-60-102 – Applicability — Local Government Energy Conservation Standards
For homes with fewer than five units not otherwise subject to the state building code, enforcement runs through a builder self-certification program rather than inspections. The builder attests the home meets the energy standards. That’s a lighter touch than a full code inspection, but you can’t ignore insulation values, window efficiency, and similar specifications when building new.
Financing, Insurance, and Resale
Building without a structural permit is legal in most of Montana, but lenders and insurers work by their own rules.
FHA loans require every property to meet HUD’s Minimum Property Requirements: safe, sound, and secure. An FHA appraiser evaluates the foundation, heating, electrical, plumbing, roof, and overall structural integrity, and can require repairs before closing.14U.S. Department of Housing and Urban Development. FHA Single Family Housing Policy Handbook 4000.1 A home framed without professional oversight that shows visible defects will trigger those conditions. Conventional lenders apply their own appraisal standards, and some ask for proof that electrical and plumbing work was permitted and inspected.
Insurance works the same way. Insurers assess risk, and a home built with no inspections is an unknown. Some will cover these properties after a private inspection; others charge higher premiums or limit coverage. Get an insurance quote before you start building, not after.
Resale brings its own disclosure duty. Montana law requires sellers of residential property to disclose adverse material facts they actually know, and the required disclosure statement must include whether any substantial additions or alterations were made without a building permit. In code-free areas where no permit was required, the answer is straightforward. Buyers who receive the disclosure have three days to rescind the contract without penalty unless the parties have agreed otherwise in writing.15Montana State Legislature. Montana Code 70-20-502 – Seller Disclosure — Statement Keep every electrical and plumbing permit, septic approval, well log, and private inspection report. That paper trail protects you at sale.
Private Covenants Can Be Stricter Than Any Code
Government rules are not the only constraints. Deed restrictions, also called covenants, conditions, and restrictions, can impose standards tighter than any building code. They are recorded against the land and run with the property no matter who owns it.
In rural Montana subdivisions, covenants often specify minimum square footage, exterior materials, roof pitch, setbacks, and architectural review by a homeowners’ association. Violating a covenant gives your neighbors standing to sue, and courts routinely order non-compliant structures to be modified or removed. Before buying any lot, pull the deed and review recorded covenants at the county clerk and recorder’s office. A code-free county means nothing if a private covenant requires you to meet one anyway.