Bolthole Index

Musselshell County, Montana

Building permits, zoning and land rules in Musselshell County, Montana

64Index Score / 100
#27 of 56 in Montana

An ordinary home in unincorporated Musselshell County, Montana does not need a state building permit, because Montana exempts residential buildings containing fewer than five dwelling units unless they serve transient guests12. Musselshell County has no county zoning, although the City of Roundup has zoning3. Septic is separate: the County Sanitarian handles local septic and subdivision reviews, and Montana requires a local drainfield permit even when state subdivision approval exists45.

At a glance

Building permit
Not required for an ordinary home with fewer than five dwelling units that does not serve transient guests12
Zoning
No county zoning in unincorporated Musselshell County; the City of Roundup has zoning3
Septic
Local drainfield permit required through the County Sanitarian; state subdivision review may also apply465
RV living
Not confirmed for a private rural parcel; ask the county before relying on full-time RV occupancy7
Tiny home
No county-zoning minimum dwelling size in unincorporated areas, but sanitation and other rules still apply8
Owner-builder
No specific owner-builder exemption was confirmed; ask the state Building Codes Program about trade permits910
County setbacks and lot size
No county-zoning setbacks or minimum lot size in unincorporated areas; other development rules may still apply1112
Water wells
A water permit is required above 35 gallons per minute or 10 acre-feet per year; smaller uses may qualify for an exception13

Who to call

Building permits

Montana Building Codes Program

State building, plumbing, electrical and mechanical permitting and inspections where no certified local building-code program applies

(406) 841-2056

[email protected]

2705 Skyway Drive, Helena MT

Online permits →

Septic permits

Musselshell County Sanitarian

County sanitation contact for septic and subdivision review

(406) 535-7466

[email protected]

300 1st Ave North, Suite 201 Lewistown, MT 59457

Floodplain permits

Musselshell County Floodplain Administration

County floodplain administration, rural addressing, emergency services and fire-warden functions

406-323-2777

12 Main St • Roundup, MT 59072

Contact details are copied from each office’s official page and were checked against it on September 27, 2026.

Do you need a building permit in Musselshell County, Montana?

Not for an ordinary small home in unincorporated Musselshell County. Montana's state-permit rules exempt residential buildings containing fewer than five dwelling units unless the building serves transient guests, and Musselshell County is not a certified local building-code jurisdiction12. Farm and ranch buildings and private garages or storage buildings used by the owner outside a commercial enterprise are also among the state exemptions14. A non-exempt project still needs a state building permit before construction, and separate electrical, plumbing or mechanical permits may apply15. For a covered project, the applicant submits construction plans and a Building Permit/Plan Review Application; state plan review averages three weeks, and the permit issues after comments are resolved and fees are paid16. The permit holder must then request required inspections when the work is ready17.

Who handles building and land permits in Musselshell County?

Musselshell County does not operate a certified local building-code program, so the Montana Building Codes Program is the right office for a non-exempt project and for questions about separate trade permits110. Call the program at (406) 841-2056 or email [email protected]; its office is at 2705 Skyway Drive, Helena MT10. For septic and subdivision sanitation questions, contact the Musselshell County Sanitarian at (406) 535-7466 or [email protected]18. For mapped flood-hazard questions and development permits, contact Musselshell County Floodplain Administration at 406-323-2777, 12 Main St • Roundup, MT 5907219. A new or modified approach onto a Montana state highway requires an approach permit or right-of-way agreement from the appropriate Montana Department of Transportation district office20. We could not confirm a separate county-road driveway permit, so ask the county before constructing an approach on a county road.

Does Musselshell County have zoning?

Unincorporated Musselshell County has no county zoning ordinance, while the City of Roundup has its own zoning321. That distinction matters: a parcel inside Roundup must follow city rules, not the county's rural no-zoning status21. On unincorporated land, Musselshell County sets no minimum dwelling size, minimum lot size, general setback, lot-coverage limit or building-height limit through county zoning812112223. No county zoning does not erase sanitation, subdivision, floodplain, highway-access or state building-code requirements11. Montana law allows county commissioners to adopt zoning after adopting a growth policy, but Musselshell County's current official description says the county has none243. Before buying near a municipal boundary, verify whether the legal description lies inside Roundup and ask the city about its zoning district.

How do septic permits work in Musselshell County?

Start with the Musselshell County Sanitarian, the local office identified for septic and subdivision reviews418. Montana DEQ separately reviews sanitation facilities for covered subdivisions, but a state Certificate of Subdivision Approval does not replace the drainfield permit required from the local health department65. Soil conditions deserve early attention: only 19.9% of Musselshell County soils are rated without severe limitations for a conventional septic drain field, so many sites may need careful placement or a different design25. Contact the Sanitarian before fixing a house location, because the septic area and replacement area can shape the usable building envelope. The county's official pages confirm local septic review, but we could not confirm from the available county material when inspections occur or a general county fee schedule; ask the Sanitarian about application documents, site evaluation, inspection stages and current fees before excavation.

Can you live in an RV or tiny home on your land in Musselshell County?

Musselshell County's lack of county zoning does not by itself confirm that full-time RV occupancy is allowed on a private rural parcel3. We could not confirm a county rule that expressly allows or prohibits living in an RV on private land, so ask the county and the Sanitarian before buying land for that use. A tiny home faces a clearer zoning answer but still needs a project-specific review: unincorporated Musselshell County has no minimum dwelling size imposed through county zoning8. The absence of a zoning minimum does not waive wastewater, floodplain, access or applicable state trade-permit requirements8. If the structure contains fewer than five dwelling units and does not serve transient guests, it falls within Montana's residential exemption from the state building permit2. A parcel inside Roundup is different because the city, unlike the county, has zoning21.

Building a home in Musselshell County: the steps, in order

  1. Confirm the parcel is in unincorporated Musselshell County rather than the zoned City of Roundup21.
  1. Contact the County Sanitarian for the septic site review and local drainfield permit before settling on the house location185.
  1. If a well will use more than 35 gallons per minute or 10 acre-feet per year, obtain the required water permit; smaller groundwater uses may qualify for an exception and current notice requirements13.
  1. Ask County Floodplain Administration whether the homesite is in a designated Special Flood Hazard Area, because development there requires a permit from the local floodplain administrator1926.
  1. Obtain an approach permit or right-of-way agreement from the Montana Department of Transportation if the driveway meets a state highway20.
  1. Confirm the residential building exemption and any electrical, plumbing or mechanical permits with the Montana Building Codes Program, then schedule any inspections tied to permits that do apply1015.

What should you check before buying land in Musselshell County?

Water and wastewater feasibility come first. Musselshell County averages about 15.1 inches of precipitation annually, and severe drought occurs in about 11.4% of years2728. A groundwater use above 35 gallons per minute or 10 acre-feet per year requires a water permit, while qualifying smaller uses may use an exception subject to current notice requirements13. Conventional septic conditions are restrictive across much of the county: only 19.9% of soils are rated without severe drain-field limitations25. Check mapped flood hazards with County Floodplain Administration and verify legal access before closing1926. The landscape is largely buildable by slope, with 73.4% of land at a slope of 15% or less, but a gentle site does not guarantee acceptable septic soil or year-round road access29. For carrying costs, the effective property-tax rate is about 0.6%, and the median annual property-tax bill is about $1,3833031.

Watch-outs

  • No county zoning does not mean no development rules: septic, floodplain, state-highway access and applicable state trade permits can still control the project352620.
  • Full-time RV occupancy on a private parcel and off-grid sanitation were not confirmed; ask Musselshell County and the County Sanitarian before relying on either use718.
  • Only 19.9% of Musselshell County soils are rated without severe limitations for a conventional septic drain field, so investigate wastewater feasibility before choosing a homesite25.

Sources

  1. Montana DLI Building Codes Program - Certified Government Programs (2026 county census)
  2. Building Permits, quoted and re-checked
  3. About Musselshell County, quoted and re-checked
  4. Musselshell County - Sanitation (2026 county census)
  5. Engineering Infrastructure & Subdivisions (Montana statewide rule), quoted and re-checked
  6. Engineering Infrastructure & Subdivisions (Montana statewide rule), quoted and re-checked
  7. About Musselshell County (2026 county census)
  8. About Musselshell County, quoted and re-checked
  9. (2026 county census)
  10. Montana Building Codes Program (bsd.dli.mt.gov)
  11. About Musselshell County, quoted and re-checked
  12. About Musselshell County, quoted and re-checked
  13. Exempt Well Updates and Information, quoted and re-checked
  14. Building Permits (Montana statewide rule), quoted and re-checked
  15. Building Permits (Montana statewide rule), quoted and re-checked
  16. Building Permits — Process, quoted and re-checked
  17. Building Permits, quoted and re-checked
  18. Musselshell County Sanitarian (musselshellcounty.gov)
  19. Musselshell County Floodplain Administration (musselshellcounty.gov)
  20. Approach Manual for Landowners and Developers (Montana statewide rule), quoted and re-checked
  21. About Musselshell County, quoted and re-checked
  22. About Musselshell County, quoted and re-checked
  23. About Musselshell County, quoted and re-checked
  24. 76-2-201. County zoning authorized, MCA (Montana statewide rule), quoted and re-checked
  25. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  26. Stream Permitting (Montana statewide rule), quoted and re-checked
  27. Annual precipitation: Bolthole Index county data
  28. Share of years in severe drought: Bolthole Index county data
  29. Share of land at 15% slope or less: Bolthole Index county data
  30. Effective property tax rate: Bolthole Index county data
  31. Median property tax bill: Bolthole Index county data

Written September 27, 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.

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County locator

Musselshell County in Montana

64
County map
Musselshell County highlighted among the Montana counties · colored by Index score

How Musselshell County scores

Seclusion89100% ev.
Self-Sufficiency29100% ev.
Admin Boringness7168% ev.
Durability43100% ev.
Property Autonomy83100% ev.
Carry Cost8396% ev.

Evidence strength: 94%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$240kTypical home
0.6%Property tax
$1,077Land / acre
15.1"Annual rain
11.4% of yrsSevere drought
11.8 / yr (+9.9)Mid-century 100°F days
21.4 daysMid-century dry spell
1" (+5.3%)Mid-century 1-day rain
1.26×Wildfire change factor
100%Forward climate coverage
$2,093Home insurance / yr
0.8% / yrInsurance growth
0.74%Nonrenewal rate
single ZIP shrunk to state medianInsurance basis
589Radius comparison (15 mi)
2.8People / sq mi
10.3%Federal land
73.4%Land at 15% slope or less
19.9%Septic soil without severe limits
233,606 acWorkable land screen
12.3%Wooded land
8.4 tonsBiomass / forest ac
45.9°FAvg temp

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Answers from the rulebook for Musselshell County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Musselshell County rules

  • County-wide zoningAbsent

    County zoning in unincorporated Musselshell County.

    • The county page separately states that the City of Roundup has zoning.
    “Zoning Ordinances City of Roundup: Yes County: No”
  • Local zoningVaries (with conditions)

    Aggregate local zoning across Musselshell County, including incorporated municipalities and unincorporated areas.

    • The county page states that City of Roundup has zoning while the county has none; this aggregate does not mean Musselshell County administers municipal zoning.
    “Zoning Ordinances City of Roundup: Yes County: No”
  • Zoning districtsNot published

    County zoning districts in unincorporated Musselshell County.

    • The county page states that the county has no zoning ordinance; City of Roundup is separately identified as having zoning.
    “Zoning Ordinances City of Roundup: Yes County: No”
  • Minimum dwelling sizeNone

    County zoning dimensional controls in unincorporated Musselshell County.

    • The absence is limited to county zoning; building, health, septic, and other rules may impose independent requirements.
    “Zoning Ordinances City of Roundup: Yes County: No”
  • Minimum lot sizeNone

    County zoning dimensional controls in unincorporated Musselshell County.

    • The absence is limited to county zoning; subdivision and sanitation rules still apply.
    “Zoning Ordinances City of Roundup: Yes County: No”
  • SetbacksNone

    County zoning setback controls in unincorporated Musselshell County.

    • No county zoning ordinance applies; other state, health, floodplain, access, or municipal rules may apply.
    “Zoning Ordinances City of Roundup: Yes County: No”
  • Lot coverageNone

    County zoning lot-coverage controls in unincorporated Musselshell County.

    • No county zoning ordinance applies; other applicable development rules may still apply.
    “Zoning Ordinances City of Roundup: Yes County: No”
  • Building heightNone

    County zoning height controls in unincorporated Musselshell County.

    • No county zoning ordinance applies; building-code and other safety requirements may still apply.
    “Zoning Ordinances City of Roundup: Yes County: No”

Montana rules that apply here

  • Building permitLimited

    Construction, remodeling, moving, alterations, additions, repairs, or changes of occupancy for buildings subject to Montana state building-code jurisdiction.

    • A state building permit is required before construction for certain types of new buildings and for certain alterations, additions, and repairs.
    • The state permit requirement does not apply to projects within the jurisdictional limits of a certified local government program; local requirements may apply there.
    • In the state's jurisdiction, state law exempts farm and ranch buildings; mining buildings on mining property; petroleum refineries and pulp and paper mills except office and shop buildings; residential buildings containing less than five dwelling units except when serving transient guests; and private garages and private storage buildings used for the owner's own use and not as part of a commercial enterprise or business.
    • Building permits must be issued on required projects before plumbing, mechanical, or electrical permits can be issued and before work authorized under those permits can start.
    “In Montana a state building permit is required prior to the start of construction for certain types of new buildings, and/or for alterations, additions, and repairs.”
    One more reviewed finding on this topic
    • Limited — State-jurisdiction construction in Montana applicable to Musselshell County where no certified local program applies.
      “In the State's jurisdiction, state law exempts the following from the need to obtain state building permits:”
  • Building code adoptedAdopted (with conditions)

    Montana's uniform state building code for residential and commercial buildings statewide.

    • The currently listed codes are amended and adopted through Administrative Rules of Montana Title 24, Chapter 301.
    • Cities, counties, and towns may enforce local building codes, all or in part, only through certified local building-code-enforcement programs.
    • State-owned agencies must be permitted through the Montana Department of Labor and Industry.
    • The listed 2021 International Building, Residential, and Existing Building Codes and related codes are effective June 11, 2022; the listed ASME boiler and pressure-vessel codes are effective November 6, 2021.

    International Building Code edition: 2021 · International Residential Code edition: 2021 · effective date for listed principal codes: 2022-06-11 (ASME boiler and pressure-vessel codes listed on the official page are effective 2021-11-06)

    “In addition, the program is responsible for adopting a uniform state building code, which is enforced statewide for residential and commercial buildings across Montana.”
  • InspectionsLimited

    Buildings and other projects requiring permits under Montana state building-code jurisdiction; certified local governments may perform inspections within their certified jurisdictional areas.

    • The Montana Building Codes Program performs inspections for projects requiring a permit under state jurisdiction.
    • The permit holder must notify the inspector when work is ready for inspection and provide access for required inspections.
    • Cities, counties, and towns may enforce local building codes and perform inspections only through certified local government programs; remaining areas fall under the state Building Codes Program.
    “The BC Program establishes and enforces statewide codes by issuing permits and performing inspections.”
    One more reviewed finding on this topic
    • Limited — Required inspections for projects covered by the state building-permit program.
      “It is the responsibility of the permit hold to notify the inspector when work is ready for inspection and to provide access for required inspections.”
  • Certificate of occupancyLimited

    Buildings constructed in accordance with the Montana state building code or a county, city, or town building code.

    • The certificate must certify that the building conforms to the applicable building regulations.
    • The statute addresses certificates for buildings constructed under the state or local building code; it does not establish a universal certificate requirement for every structure or every occupancy.
    “A certificate of occupancy for a building constructed in accordance with the provisions of the state building code or county, city, or town building code must certify that the building conforms to the requirements of the building regulations applicable to it.”
  • Who permits septicMixed (with conditions)

    Montana statewide sanitation and septic regulation, including subdivision sanitation review and drainfield permitting.

    • Montana DEQ administers subdivision sanitation review for covered divisions of land and related facilities.
    • The drainfield permit is administered by the local health department even when a Certificate of Subdivision Approval exists.
    “The DEQ Subdivision Program reviews divisions of land comprising less than 20 acres [...] This review is limited to sanitation facilities, including the water supply, sewage disposal, solid waste disposal, and storm drainage systems. [...] Yes, even thought you have a COSA, a drainfield permit is still required by the local health department.”
  • Septic permitRequired

    Installation of a drainfield in Montana, including property already covered by a Certificate of Subdivision Approval.

    • A Certificate of Subdivision Approval does not replace the drainfield permit.
    • The cited page identifies the local health department as the permitting authority.
    “Yes, even thought you have a COSA, a drainfield permit is still required by the local health department.”
  • Well permitLimited

    New groundwater uses and wells serving Musselshell County.

    • A water permit is required for groundwater uses over 35 gallons per minute or 10 acre-feet per year; qualifying smaller uses may fall under an exempt-well exception and current Notice of Intent requirements.

    groundwater flow threshold: > 35 gallons per minute (Uses at or below the threshold may qualify for an exemption.) · annual groundwater volume threshold: > 10 acre-feet per year (Uses at or below the threshold may qualify for an exemption.)

    “A water permit is required for all surface water use and groundwater uses over 35 gallons per minute (gpm) or 10 acre-feet per year.”
  • Driveway accessLimited

    New or modified driveway approaches intersecting Montana state highways, and changes in use of property abutting a state highway or an existing approach.

    • A new or modified approach requires either an approach permit or a right-of-way agreement.
    • A change in property use or change in use of an existing approach requires a new approach permit.
    • The landowner is responsible for obtaining the new permit.
    • The application must be made to the appropriate MDT District Office.
    • A detailed site plan and Environmental Checklist Form are required.
    • The requirement concerns state highways; local roads may be administered by local governments.
    “ALL NEW OR MODIFIED APPROACHES REQUIRE EITHER AN APPROACH PERMIT OR A RIGHT-OF-WAY AGREEMENT.”
  • Building in a floodplainRequired

    New development within a designated Special Flood Hazard Area in Montana.

    • The applicant must check with the local floodplain administrator to determine whether an SFHA has been designated.
    • Covered development includes placement of fill, roads, bridges, culverts, transmission lines, irrigation facilities, storage of equipment or materials, excavation, new construction or development, placement or replacement of manufactured homes, and new construction, additions, or substantial improvements to residential and commercial buildings.
    • Permit applications are obtained from the local floodplain administrator.
    • Application fees and timelines are established by the local government and vary widely throughout the state.
    “Anyone planning new development within a designated Special Flood Hazard Areas (SFHA).”
  • Short-term rentalsLimited

    Short-term rentals operated in Montana.

    • A Property Manager license is required unless the operator qualifies for an exemption under MCA § 37-56-104 or MCA § 50-51.
    • Local land-use, lodging, tax, and public-accommodation requirements may also apply.

    application fee: 50 USD

    “Short Term Rentals: A Property Manager license is required for short term rentals unless an operator qualifies for an exemption”
  • Permit feesVariable (with conditions)

    State building permit and plan-review fees for state-administered building permits.

    • The building permit fee is calculated by the bureau under IBC Section 109.2 as modified by ARM 24.301.138.
    • A plan review fee is charged in addition to the building permit fee and equals 35 percent of the building permit fee.
    • Both fees must be paid before the building permit is issued.
    • Local governments certified to enforce the state building code may establish their own permit fees and valuation method.

    plan review fee: 35 percent of building permit fee

    “The plan review fee is 35 percent of the building permit fee as established in Table 109.2.”
  • Permit processPublished (with conditions)

    State-administered Montana building permits for covered non-exempt construction outside certified local-government jurisdictions.

    • A state permit applies to certain new buildings and alterations, additions, and repairs.
    • Projects within the jurisdictional limits of a certified local government program are excluded from the state permit program.
    • Construction plans and a Building Permit/Plan Review Application must be submitted for review and approval.
    • The permit is issued after plan-review comments are satisfactorily answered and fees are paid.
    • Separate electrical, plumbing, and mechanical permits may be required.
    • The permit holder must notify the inspector when work is ready and provide access for required inspections.

    average plan review time: three weeks (Actual timing depends on workload, project size, and deficiencies.)

    “To obtain a state building permit, submit construction plans and a Building Permit/Plan Review Application to the Building Codes Program for review and approval.”
    One more reviewed finding on this topic
    • Partial — State building-permit process applicable to covered projects in Musselshell County's state jurisdiction.
      “On average it takes three weeks for a plan to be reviewed.”
  • Campground & park staysLimited

    Camping in Montana Fish, Wildlife & Parks public-use sites.

    • Camping is prohibited except in areas specifically designated or marked for camping.
    • A camping unit, vehicle, equipment, or personal items may not be left overnight without a person present.
    • Camping longer than 7 nights at one or more campsites in a public use area during any consecutive 30-day period is prohibited unless otherwise posted by the department.
    • Designated occupancy limits must not be exceeded.
    • Special-use-permit terms must be followed unless otherwise posted.
    • Campsites must be vacated by 1 p.m. on the day of departure; camping facilities must be vacated by 12 p.m. on the day of departure.

    maximum camping duration: <= 7 nights per consecutive 30-day period (unless otherwise posted by the department) · campsite departure time: 1 p.m. · camping-facility departure time: 12 p.m.

    “Unless otherwise posted by the department, within a public use site it is prohibited to: [...] camp at one or more campsites in a public use area for a period of longer than 7 nights during any consecutive 30-day period, beginning with the first night occupied unless otherwise posted by the department;”
  • county zoning authorityGeneral

    Montana boards of county commissioners adopting zoning regulations for all or parts of their jurisdictional areas, including unincorporated land.

    • The board of county commissioners must have adopted a growth policy pursuant to Montana Code Annotated chapter 1.
    • Zoning regulations must be adopted in accordance with Title 76, chapter 2.
    • The statute also contains a temporary provision for counties that adopted a master plan before October 1, 1999; that provision authorized adoption or revision only until October 1, 2006.
    “a board of county commissioners that has adopted a growth policy pursuant to chapter 1 is authorized to adopt zoning regulations”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Owner-builder exemption — Owner-builder exemptions in unincorporated Musselshell County.
  • Septic inspection — Septic inspections in Musselshell County.
  • Off-grid sanitation — Off-grid sanitation systems in Musselshell County.
  • Mandatory utility hookup — Water and sewer connection requirements in Musselshell County.

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.

Living off-grid in Musselshell County, Montana

Is Musselshell County a good place to live off-grid or homestead?

Musselshell County scores 64/100 on the Bolthole Index, a strong county profile. Its strengths: deep seclusion — about 589 people within 15 miles and a stronger property-autonomy legal backdrop. Watch-outs: thin water margin (15.1″/yr rainfall).

Do you need a building permit in Musselshell County, Montana?

Musselshell County does not require a county building permit for a home in unincorporated areas, and it has no county-wide zoning. Onsite septic is permitted by Musselshell County Sanitation Services (County Sanitarian). These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

How much does land cost in Musselshell County, Montana?

Land in Musselshell County runs about $1,077 per acre, based on the latest county data.

What is the water situation in Musselshell County?

Musselshell County gets about 15.1" of rain a year, with severe drought in roughly 11.4% of years.

How remote is Musselshell County?

A typical private-land location has about 589 people within 15 miles and 237,486 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

Off-grid gear

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

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How Musselshell compares in Montana

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