Bolthole Index

Musselshell County, Montana

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

64Index Score / 100
#27 of 56 in Montana

A private home or apartment with 4 or fewer units, without transient guests, needs no state building permit in unincorporated Musselshell County, Montana1. Musselshell County has no county zoning; Roundup has city building permits and zoning234. Rural drainfields require a local permit through county contract sanitarians, while Roundup prohibits additional septic installations567.

At a glance

Building permit
No state building permit for private homes or apartments with 4 or fewer units without transient guests; Roundup requires city building permits12
Zoning
No county zoning in unincorporated Musselshell County; the City of Roundup has zoning43
Septic
Rural drainfields need a local permit through contract sanitarians; Roundup prohibits additional septic installations567
RV living
No county-zoning restriction in unincorporated areas; septic, floodplain and other rules still apply8
Tiny home
No county-zoning occupancy restriction or minimum dwelling size in unincorporated areas910
Owner-builder
Personal-use homeowner plumbing may be permit-exempt but needs inspection before covering; homeowner wiring needs a state electrical permit1112
County setbacks and lot size
No county-zoning setbacks or minimum lot size in unincorporated areas; other development rules may still apply1314
Water wells
A water permit is required above 35 gallons per minute or 10 acre-feet per year; smaller uses may qualify for an exception15

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

buildingcodes@mt.gov

2705 Skyway Drive, Helena MT

Online permits →

Septic permits

Musselshell County Sanitarian

County sanitation contact for septic and subdivision review

(406) 535-7466

sanitarian2@co.fergus.mt.us

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 October 11, 2026.

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

A private home or apartment with 4 or fewer units that does not serve transient guests is exempt from the state building permit in unincorporated Musselshell County1. Farm and ranch buildings are also exempt from state building permits16. Inside Roundup, city building permits are required for fences, additions and new construction2. Montana’s adopted codes and separate trade-permit rules still need attention; the 2024 codes took effect September 26, 20261718. For non-exempt projects, obtain the state building permit before construction and before trade permits are issued19. Submit construction plans and a Building Permit/Plan Review Application, resolve review comments and pay both fees before issuance18. The state plan-review fee is 35% of the building permit fee20. State building-permit holders must request required inspections and provide access when work is ready21.

Who handles building permits in Musselshell County?

The Montana Building Codes Program handles covered projects in Musselshell County and answers questions about separate trade permits1722. Call the program at (406) 841-2056 or email buildingcodes@mt.gov; its office is at 2705 Skyway Drive, Helena MT22. Musselshell County uses contract sanitarians for septic and subdivision review and directs applicants to its main line for routing; the published survey-review contact is the County Sanitarian at (406) 535-7466 or sanitarian2@co.fergus.mt.us623. For mapped flood-hazard questions, contact Musselshell County Floodplain Administration at 406-323-2777, 12 Main St • Roundup, MT 5907224. A new or modified approach onto a Montana state highway requires an approach permit or right-of-way agreement25. We could not confirm a county-road driveway permit requirement; ask the Musselshell County Road Department before building an approach.

Does Musselshell County have zoning?

Unincorporated Musselshell County has no county zoning ordinance or county zoning districts426. Zoning varies across Musselshell County because incorporated land follows a different authority27. Inside Roundup, the city administers zoning and requires building permits for fences, additions and new construction32. County contract sanitarians handle rural septic review; Roundup prohibits additional onsite septic installations67. On unincorporated land, county zoning imposes no minimum dwelling size, minimum lot size, general setback, lot-coverage limit or building-height limit1014132829. County zoning also does not restrict manufactured-home occupancy or an accessory dwelling there, but sanitation, subdivision, floodplain, access and applicable state building-code rules remain separate3031.

How do septic permits work in Musselshell County?

A local health-department drainfield permit is required before drainfield installation on rural Musselshell County land, even when a certificate of subdivision approval exists5. Musselshell County uses contract sanitarians for septic and subdivision review, while Montana DEQ handles state sanitation approval and subdivision review6. Start with the County Sanitarian before excavation and ask which inspection stages apply because we could not confirm a published local inspection schedule23. Soil conditions deserve early attention: only 19.9% of Musselshell County soils are rated without severe limitations for a conventional septic drain field32. A parcel division adds formal review by the County Examining Land Surveyor and County Sanitarian33. Inside Roundup, additional septic tanks, cesspools, cisterns and privy vaults are prohibited; a rural drainfield permit does not establish permission for a new city installation7.

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

Unincorporated Musselshell County has no county-zoning restriction on RV occupancy or temporary camping on private land834. Unincorporated Musselshell County likewise has no county-zoning restriction on tiny-home occupancy and no zoning-based minimum dwelling size910. Those are zoning answers, not exemptions from septic, subdivision, floodplain, access or state building-code rules89. A drainfield still requires a local permit, so give the County Sanitarian the proposed wastewater arrangement before occupying an RV or tiny home523. We could not confirm a general rule for alternative off-grid sanitation; ask the County Sanitarian about the proposed system23. Inside Roundup, city zoning applies and additional septic installations are prohibited37.

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

  1. Confirm the parcel is in unincorporated Musselshell County rather than Roundup, which has city building permits and zoning23.
  1. Contact the contract County Sanitarian before choosing the homesite, obtain the required drainfield permit and ask which inspections apply6523.
  1. If a well will use more than 35 gallons per minute or 10 acre-feet per year, obtain the required water permit; smaller uses may qualify for an exception and current notice requirements15.
  1. Ask County Floodplain Administration whether the homesite is in a designated Special Flood Hazard Area; new development there requires a local floodplain development permit2435.
  1. Obtain an approach permit or right-of-way agreement if the driveway meets a Montana state highway25.
  1. Confirm the residential exemption and separate trade permits with the Montana Building Codes Program; for covered work, submit plans before construction and request inspections when ready22191821.
  1. If doing plumbing yourself, use the homeowner exemption only for your personal-use residence, not speculative resale or rental, and request inspection before covering plumbing; obtain a state homeowner’s electrical permit before wiring your home1112.

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 years3637. 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 requirements15. Only 19.9% of county soils are rated without severe limitations for a conventional septic drain field32. If a certificate of survey is involved, the Examining Land Surveyor and County Sanitarian perform preliminary review, and the $250 review fee is due at filing in addition to filing fees and supplemental documents3338. Electronic and hard-copy submissions are accepted, and corrections must be completed before final filing39. Check flood hazards and legal access before closing4025. An agricultural-tract subdivision exemption requires covenant language on the survey and a landowner certificate citing the exemption; the farm-building permit exemption does not replace those survey requirements4116.

Watch-outs

  • No county zoning does not mean no development rules: septic permitting, floodplain permitting, state-highway access and applicable state trade permits can still control the project453525.
  • County zoning does not restrict RV occupancy or temporary camping on unincorporated land, but a drainfield still requires a local permit; take the proposed setup to the County Sanitarian834523.
  • 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 homesite32.

Sources

  1. bsd.dli.mt.gov, quoted and re-checked
  2. Roundup: Building and Codes - City of Roundup (Musselshell County), quoted and re-checked
  3. Roundup: Roundup Growth Policy (Musselshell County), quoted and re-checked
  4. About | Musselshell County, quoted and re-checked
  5. deq.mt.gov, quoted and re-checked
  6. Health Services | Musselshell County, quoted and re-checked
  7. Roundup: Code of Ordinances, Section 26-71 (Musselshell County), quoted and re-checked
  8. About | Musselshell County, quoted and re-checked
  9. About | Musselshell County, quoted and re-checked
  10. About | Musselshell County, quoted and re-checked
  11. Certified City, County and Town Programs, quoted and re-checked
  12. Certified City, County and Town Programs, quoted and re-checked
  13. About | Musselshell County, quoted and re-checked
  14. About | Musselshell County, quoted and re-checked
  15. Exempt Well Updates and Information, quoted and re-checked
  16. Building Permits, quoted and re-checked
  17. Certified City, County and Town Programs, quoted and re-checked
  18. Building Permits, quoted and re-checked
  19. bsd.dli.mt.gov, quoted and re-checked
  20. bsd.dli.mt.gov, quoted and re-checked
  21. Building Permits, quoted and re-checked
  22. Montana Building Codes Program (bsd.dli.mt.gov)
  23. Musselshell County Sanitarian (musselshellcounty.gov)
  24. Musselshell County Floodplain Administration (musselshellcounty.gov)
  25. Approach Manual for Landowners and Developers, quoted and re-checked
  26. About Musselshell County, quoted and re-checked
  27. About | Musselshell County, quoted and re-checked
  28. About | Musselshell County, quoted and re-checked
  29. About | Musselshell County, quoted and re-checked
  30. About | Musselshell County, quoted and re-checked
  31. About | Musselshell County, quoted and re-checked
  32. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  33. Planning & Development | Musselshell County, quoted and re-checked
  34. About | Musselshell County, quoted and re-checked
  35. Stream Permitting | Montana DNRC, quoted and re-checked
  36. Annual precipitation: Bolthole Index county data
  37. Share of years in severe drought: Bolthole Index county data
  38. musselshellcounty.gov, quoted and re-checked
  39. musselshellcounty.gov, quoted and re-checked
  40. Part IV Subdivision Checklist, quoted and re-checked
  41. Survey Review Checklist | Musselshell County, quoted and re-checked

Written October 11, 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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Compared with neighboring counties

Like 5 of its 6 neighbors, Musselshell County requires no county building permit for a home.

RuleMusselshell CountyYellowstone CountyGolden Valley CountyPetroleum CountyTreasure CountyStillwater CountyBig Horn County
Building permitNot requiredNot requiredNot requiredNot requiredNot requiredLimitedNot required
County zoningNoYesNot publishedNoNoYesNot published
Septic permitsCounty Sanitation ServicesRiverStone HealthCounty SanitarianMT Dept. of Env. QualityCounty SanitarianCounty Env. Health Dept.County Public Health Dept.

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%Soils rated "not limited" for septic (strict USDA rating)
233,606 acWorkable land screen
12.3%Wooded land
8.4 tonsBiomass / forest ac
45.9°FAvg temp

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Cities and towns in Musselshell County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Not yet researched: Town of Melstone

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 ordinance in Musselshell County; incorporated Roundup is separately identified as having zoning.

    • The county source separately states that the City of Roundup has zoning.
    “Zoning Ordinances City of Roundup: Yes County: No”
    One more reviewed finding on this topic
    • Absent — County zoning in unincorporated Musselshell County.
      “Zoning Ordinances City of Roundup: Yes County: No”
  • Local zoningVaries (with conditions)

    County aggregate: unincorporated county areas have no county zoning, while the City of Roundup is identified as having zoning.

    • This is an aggregate conclusion and does not mean Musselshell County administers municipal zoning.
    • The county source identifies Roundup as having zoning and the county as having none.
    “Zoning Ordinances City of Roundup: Yes County: No”
    One more reviewed finding on this topic
    • Varies (with conditions) — Aggregate local zoning across Musselshell County, including incorporated municipalities and unincorporated areas.
      “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 minimum dwelling-size requirement in unincorporated Musselshell County.

    • No county zoning ordinance is stated; state building-code and other non-zoning requirements may still apply.
    “Zoning Ordinances City of Roundup: Yes County: No”
  • Minimum lot sizeNone

    County zoning minimum lot-size requirement in unincorporated Musselshell County.

    • No county zoning ordinance is stated; subdivision regulations and sanitary requirements may still impose parcel standards.
    “Zoning Ordinances City of Roundup: Yes County: No”
  • SetbacksNone

    County zoning setbacks in unincorporated Musselshell County.

    • No county zoning ordinance is stated; building, road, floodplain, and other applicable rules may still impose location constraints.
    “Zoning Ordinances City of Roundup: Yes County: No”
  • Lot coverageNone

    County zoning lot-coverage requirement in unincorporated Musselshell County.

    • No county zoning ordinance is stated; other applicable building or subdivision requirements may apply.
    “Zoning Ordinances City of Roundup: Yes County: No”
  • Building heightNone

    County zoning building-height requirement in unincorporated Musselshell County.

    • No county zoning ordinance is stated; state building-code and other safety rules may still apply.
    “Zoning Ordinances City of Roundup: Yes County: No”
  • Living in an RVUnrestricted

    County zoning restrictions on RV occupancy in unincorporated Musselshell County.

    • The county's no-zoning statement does not remove state, municipal, septic, subdivision, floodplain, building-code, or other applicable requirements.
    • The City of Roundup is separately identified as having zoning.
    “Zoning Ordinances City of Roundup: Yes County: No”
  • Camping on your landUnrestricted

    County zoning restrictions on temporary camping in unincorporated Musselshell County.

    • The county's no-zoning statement does not remove state, municipal, septic, subdivision, floodplain, building-code, or other applicable requirements.
    • The City of Roundup is separately identified as having zoning.
    “Zoning Ordinances City of Roundup: Yes County: No”
  • Tiny homesUnrestricted

    County zoning restrictions on tiny-home occupancy in unincorporated Musselshell County.

    • The county's no-zoning statement does not remove state, municipal, septic, subdivision, floodplain, building-code, or other applicable requirements.
    • The City of Roundup is separately identified as having zoning.
    “Zoning Ordinances City of Roundup: Yes County: No”
  • Manufactured homesUnrestricted

    County zoning restrictions on manufactured-home occupancy in unincorporated Musselshell County.

    • The county's no-zoning statement does not remove state, municipal, septic, subdivision, floodplain, building-code, or other applicable requirements.
    • The City of Roundup is separately identified as having zoning.
    “Zoning Ordinances City of Roundup: Yes County: No”
  • Accessory dwellingsUnrestricted

    County zoning restrictions on accessory dwellings in unincorporated Musselshell County.

    • The county's no-zoning statement does not remove state, municipal, septic, subdivision, floodplain, building-code, or other applicable requirements.
    • The City of Roundup is separately identified as having zoning.
    “Zoning Ordinances City of Roundup: Yes County: No”
  • Who permits septicMixed (with conditions)

    Septic and subdivision sanitation review in Musselshell County.

    • Musselshell County uses contract sanitarians for health inspections and septic/subdivision reviews.
    • Montana DEQ provides state sanitation approval and subdivision review; local health departments issue drainfield permits.
    “We have contract sanitarians for health inspections and septic/subdivision reviews. Please contact main line to be directed to the appropriate sanitarian.”
    One more reviewed finding on this topic
    • County (with conditions) — Septic and subdivision reviews handled through Musselshell County's environmental-health function.
      “We have contract sanitarians for health inspections and septic/subdivision reviews. Please contact main line to be directed to the appropriate sanitarian.”
  • Septic permitRequired

    Drainfield installation in Musselshell County.

    • A drainfield permit is required from the local health department even when a COSA exists.
    “Yes, even thought you have a COSA, a drainfield permit is still required by the local health department.”
  • Agricultural exemptionConditional

    Agricultural-tract subdivision exemption claims in Musselshell County survey review.

    • The official checklist lists Ag Tract as an exemption that may be claimed.
    • An agricultural-tract exemption requires covenant language on the survey.
    • The checklist also requires a landowner certificate citing the subdivision exemption, except for retracement surveys.
    “EXEMPTION CLAIMED: ☐Boundary Relocation ☐Family Transfer ☐Mortgage ☐Court Ordered ☐Retracement ☐Ag Tract ☐Misc. (public utility site, cemetery, etc.)”
  • Subdividing landRegulated (with conditions)

    Certificate-of-survey and subdivision review in Musselshell County.

    • Electronic or hard-copy submission is available.
    • The County Examining Land Surveyor and County Sanitarian conduct preliminary review.
    • Record sets require the submitting surveyor's stamp and signature and notarized landowner signatures.
    • A $250 review fee is due at filing, in addition to filing fees and any required supplemental documents.
    • The checklist identifies exemptions including boundary relocation, family transfer, mortgage, court-ordered, retracement, ag tract, and miscellaneous exemptions.

    review fee: 250 USD (in addition to filing fee and required supplemental documents)

    “Review Process: Examining Land Surveyor and County Sanitarian will complete preliminary review of COS to ensure compliance.”
    2 more reviewed findings on this topic
    • Limited — Certificate-of-survey review and filing in Musselshell County.
      “Review Process: Examining Land Surveyor and County Sanitarian will complete preliminary review of COS to ensure compliance. [...] The review fee of $250 is due at time of filing, along with the filing fee and any supplemental documents (deeds, certificates, etc.) as required by the Clerk and Recorder.”
    • Regulated (with conditions) — Subdivision and certificate-of-survey review in Musselshell County.
      “Review Process: Examining Land Surveyor and County Sanitarian will complete preliminary review of COS to ensure compliance.”
  • Permit feesPublished (with conditions)

    Musselshell County certificate-of-survey review and filing

    • The $250 review fee is due at filing.
    • The review fee is in addition to the filing fee and any supplemental documents required by the Clerk and Recorder.

    certificate-of-survey review fee: 250 USD (Due at filing, along with filing fee and any required supplemental documents.)

    “The review fee of $250 is due at time of filing, along with the filing fee and any supplemental documents”
    One more reviewed finding on this topic
    • Published (with conditions) — Musselshell County certificate-of-survey review.
      “The review fee of $250 is due at time of filing, along with the filing fee and any supplemental documents (deeds, certificates, etc.) as required by the Clerk and Recorder.”
  • Permit processPublished (with conditions)

    Musselshell County certificate-of-survey review process

    • The published process permits either electronic or hard-copy submittal.
    • Preliminary review is performed by the County Examining Land Surveyor and County Sanitarian.
    • The applicant must make necessary corrections if requested and submit the record set for final review and filing.
    “Certificate of Survey for review can be submitted either electronically OR in hard copy format.”
    One more reviewed finding on this topic
    • Published (with conditions) — Certificate-of-survey review and filing process.
      “Certificate of Survey for review can be submitted either electronically OR in hard copy format. The process for each submittal type is outlined below:”

Montana rules that apply here

  • Building permitNot required

    Private homes and apartments with four or fewer units that do not serve transient guests, in the State Building Codes Program jurisdiction applicable outside certified local jurisdictions

    • This is an exemption from the state building-permit process.
    • Additional local requirements may apply; Musselshell County is not listed on the state's certified-local-jurisdiction page.
    • The exemption does not cover a residence serving transient guests.

    maximum dwelling units: <= 4 dwelling units (The private home or apartment must not serve transient guests.)

    “Private homes and apartments with four or fewer units that do not serve transient guests.”
    4 more reviewed findings 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:”
    • Required — Non-exempt buildings built, remodeled, moved, or undergoing a change of occupancy in unincorporated Musselshell County, because the county is not listed as a certified local jurisdiction.
      “Prior to the start of construction for all state-owned agencies or non-exempt building being built, remodeled, moved, or undergoing a change of occupancy, except for projects located within the jurisdictional limits of a certified local government program.”
    • Limited — Building permits for projects in non-certified areas of Musselshell County under State Building Codes Bureau jurisdiction.
      “In the State's jurisdiction, state law exempts the following from the need to obtain state building permits: 1. farm and ranch buildings 2. mining buildings on mining property 3. petroleum refineries and pulp and paper mills (except office and shop buildings) 4. residential buildings containing less than five dwelling units (except when serving transient guests) 5. private garages and private storage buildings used for the owner's own use (not part of a commercial enterprise or business)”
    • Limited — Construction, remodeling, moving, alterations, additions, repairs, or changes of occupancy for buildings subject to Montana state building-code jurisdiction.
      “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.”
  • Owner-builder exemptionConditional

    Owner-performed plumbing installation in Musselshell County areas under Montana state building-code jurisdiction.

    • Musselshell County is not listed among the certified local government building-code jurisdictions; the official state page states that all other areas are under the State Building Codes Bureau.
    • The homeowner must perform the plumbing installation personally.
    • The residence must be for the owner's personal use.
    • The residence must not be built on speculation of resale or intended as a rental property.
    • A plumbing inspection must be requested and conducted before any portion of the plumbing work is covered.
    • All plumbing must meet the Uniform Plumbing Code.
    • Farms and ranches, mines, mills, smelters, railroads, and public utilities are separately exempt from state plumbing permit requirements.
    • The Department states that the 2021 Uniform Plumbing Code was adopted effective June 11, 2022.
    “All other areas fall under the State's jurisdiction. Contact the Building Codes Bureau or local government to determine which jurisdiction you are in. Homeowners do not need to obtain a plumbing permit provided he/she is doing the plumbing installation themselves and the residence is for the owner's personal use and not built on speculation of resale or intended as a rental property.”
    2 more reviewed findings on this topic
    • Conditional — Owner-performed electrical wiring in Musselshell County areas under Montana state electrical-code jurisdiction.
      “State electrical permits are required on all electrical work performed in Montana, except in cities, counties and towns certified to issue electrical permits and conduct inspections. A homeowner may wire his/her own home, garage and premises using a State homeowner's electrical permit. Inspections are conducted by State Electrical Inspectors and permits are obtained from the bureau.”
    • Available — An owner working on the owner's property, or an owner contracting for work performed by a registered construction contractor, under Montana's construction-contractor licensing chapter.
      “(13) to an owner working on the owner's property, whether occupied by the owner or not, but this exemption does not apply to an owner”
  • 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.”
    3 more reviewed findings on this topic
    • Adopted (with conditions) — Montana building codes applicable in areas under the State Building Codes Bureau, including county areas without a certified local building-code program.
      “All of the codes listed below are amended and adopted by: Administrative Rules of Montana (ARM) Title 24, Chapter 301 [...] International Residential Code, 2024 Edition - Effective: September 26, 2026”
    • Adopted (with conditions) — Residential and commercial buildings statewide, including areas of Musselshell County outside a certified local program
      “The BC Program establishes and enforces statewide codes by issuing permits and performing inspections.”
    • Partial — Montana's statewide building-code framework for residential and commercial construction.
      “In Montana, cities, counties and towns have the option to enforce local building, electrical, plumbing, and mechanical codes, all or in part (except for state-owned agencies, which must be permitted through this Department). These local building code enforcement programs must be certified by the BC Program. The remaining cities, counties and towns that have chosen not to enforce building codes, fall under the jurisdiction of the BC Program. [...] 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.”
    3 more reviewed findings 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.”
    • Required — Projects subject to a Montana state building permit in unincorporated Musselshell County.
      “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.”
    • Limited — Required state-permitted construction in areas of Musselshell County under State Building Codes Bureau jurisdiction.
      “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.”
  • Well permitLimited

    New groundwater developments in Montana using 35 gallons per minute or less and no more than 10 acre-feet per year.

    • All water uses starting after June 30, 1973, require a water right either through a water-use permit or an exception to the permitting process.
    • The development may qualify for the exception; qualification is not automatic.
    • Completed groundwater uses that meet the permit exception receive a Groundwater Certificate rather than a water permit.
    • A permitted water right is required for a combined appropriation from the same source by two or more wells or developed springs exceeding 10 acre-feet, regardless of flow rate.
    • All lots in a multi-phase subdivision must share a combined water-use limit of 10 acre-feet per year to qualify for a permit exception.
    • Beginning January 1, 2026, a water user intending to develop water use through a permit exception must file a Notice of Intent with DNRC before using water from an exempt well.
    • DNRC reviews a correct and complete Notice of Intent within 10 business days; if eligible, it authorizes the Notice of Intent and gives the user five years to complete the project, put the water to use, and file a Notice of Completion.
    • If the proposed use is not eligible, the Notice of Intent is denied and the user is directed to the water-right permit process.
    • The Notice of Intent filing fee is $400.
    • An authorized Notice of Intent expires after five years, with an opportunity for one five-year extension.

    maximum flow rate: <= 35 gpm · maximum annual volume: <= 10 acre-feet per year · Notice of Intent fee: 400 USD (Beginning January 1, 2026) · Notice of Intent review period: 10 business days (For a correct and complete Notice of Intent) · authorized Notice of Intent term: 5 years (One five-year extension opportunity is available)

    “Permit Exceptions, a.k.a. Exempt Wells: Small groundwater developments that use 35 gpm or less and do not exceed 10 acre-feet per year are known as “exempt wells” and may qualify for an exception to the water permit process.”
    2 more reviewed findings on this topic
    • Limited — New groundwater uses and wells serving Musselshell County.
      “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.”
    • Required — Surface-water uses and groundwater uses exceeding 35 gallons per minute or 10 acre-feet per year in Montana.
      “Water Permits: 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 accessRequired

    New or modified driveway approaches accessing a Montana state highway in Musselshell County

    • A right-of-way agreement is an alternative to an approach permit.
    • A change in property use abutting a state highway, or in an existing approach's use, requires a new approach permit.
    • The owner must sign the application before review and approval.
    • The applicant may not begin construction until the environmental checklist is reviewed and approved as necessary and requested approval conditions are incorporated.
    • Construction in highway right-of-way cannot begin until an approved permit or authorization letter is issued.
    • Access-control highways, significant traffic volume, or significant environmental impacts require the Systems Impact Process.
    “ALL NEW OR MODIFIED APPROACHES REQUIRE EITHER AN APPROACH PERMIT OR A RIGHT-OF-WAY AGREEMENT.”
    One more reviewed finding on this topic
    • Limited — New or modified driveway approaches intersecting Montana state highways, and changes in use of property abutting a state highway or an existing approach.
      “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).”
    2 more reviewed findings on this topic
    • Limited — Subdivision sanitation review involving floodplains.
      “Are 100-year floodplain requirements met, and floodplains and drainages shown?”
    • Required — New development in a designated Special Flood Hazard Area in Montana, including applicable areas of Musselshell County.
      “Anyone planning new development within a designated Special Flood Hazard Areas (SFHA). Check with local floodplain administrator to determine whether a Special Flood Hazard Areas (SFHA) has been designated for the stream of interest.”
  • 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”
  • 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;”
    One more reviewed finding on this topic
    • Limited — Dispersed and designated-campground temporary camping on legally accessible Montana state trust land administered by DNRC.
      “Dispersed camping is allowed on state trust land with the appropriate permit and with certain restrictions. Dispersed camping on state trust land is allowed with a Conservation License. Camping that is incidental to hunting or fishing is permitted through your conservation license, and no additional permitting is required. Group camping requires a special recreational use license. On leased or licensed land: 2 days On unleased/unlicensed land: 16 days within a 30-day period Within designated campground: 16 days within a 30-day period”
  • county zoning authorityGeneral

    Montana county boards of commissioners' authority to adopt zoning regulations, including in unincorporated portions of established jurisdictional areas.

    • The board of county commissioners must have adopted a growth policy pursuant to Title 76, chapter 1.
    • Zoning may be adopted for all or parts of the jurisdictional area in accordance with Title 76, chapter 2, part 2.
    • Within unincorporated portions of an established jurisdictional area, the board may establish zoning regulations by resolution or divide the county into zoning districts.
    • Zoning regulations may regulate the erection, construction, reconstruction, alteration, repair, location, or use of buildings or structures and the use of land.
    • An action challenging creation of a zoning district or adoption of zoning regulations must be commenced within 6 months after the board's order.
    • Regulations in one district may differ from those in other districts.
    • The statute also states that zoning regulations may not treat manufactured housing or factory-built housing units differently from other residential units, subject to the statutory presumption concerning placement.

    challenge period: 6 months (after the date of the board order creating the district or adopting the regulations)

    “For the purpose of promoting the public health, safety, morals, and general welfare, a board of county commissioners that has adopted a growth policy pursuant to chapter 1 is authorized to adopt zoning regulations for all or parts of the jurisdictional area in accordance with the provisions of this part.”
    One more reviewed finding on this topic
    • General — Montana county boards of commissioners adopting zoning regulations for all or parts of their jurisdictional areas, including unincorporated portions where the statutory prerequisites are met.
      “a board of county commissioners that has adopted a growth policy pursuant to chapter 1 is authorized to adopt zoning regulations”
  • county building authorityGeneral

    Montana counties may adopt and enforce building codes and require construction permits for residential construction in unincorporated county areas, subject to the statutory certification, geographic, code-content, and permit requirements.

    • A county may adopt a building code by ordinance or resolution, or authorize adoption by administrative action.
    • A county may adopt its building code on a countywide basis unless a city or town within the county has adopted a building code; the county may not enforce its county building code within that city or town.
    • The county code-enforcement program must be certified by the Montana Department of Labor and Industry.
    • The current adopted code, current fee list, and current enforcement plan must be filed with and approved by the Department.
    • Inspectors must satisfy the stated state-licensing or approved national-certification requirements.
    • Except for voluntary incentive-based energy-conservation standards, the county may not adopt or enforce a building code more stringent than the code adopted by the Department or required by state law.
    • The county may prohibit construction from commencing until the required permit is issued after compliance is shown.
    • The general construction-permit requirement applies to buildings subject to Title 50, chapter 60, parts 1 through 4.
    • State agency-owned buildings remain under state Department jurisdiction for plan review, permitting, and inspections.
    “The local legislative body of a county, city, or town may adopt a building code to apply to the county, city, or town by an ordinance or resolution, as appropriate: (a) adopting a building code; or (b) authorizing the adoption of a building code by administrative action.”
    One more reviewed finding on this topic
    • General — Montana counties' authority to adopt and enforce building codes and require building-code administration for construction in county areas, including unincorporated areas.
      “The local legislative body of a county, city, or town may adopt a building code to apply to the county, city, or town by an ordinance or resolution, as appropriate: (a) adopting a building code; or (b) authorizing the adoption of a building code by administrative action.”

Still unanswered

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

  • 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). Owner-builders may act as their own contractor to build their home. 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.

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

Living in an RV on your own land in Musselshell County is allowed: County zoning restrictions on RV occupancy in unincorporated Musselshell County. The county's no-zoning statement does not remove state, municipal, septic, subdivision, floodplain, building-code, or other applicable requirements. The City of Roundup is separately identified as having zoning. A tiny home is allowed. Confirm with the county before relying on it.

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.

How Musselshell compares in Montana

Compare side-by-side →See all 56 Montana counties ranked →