Bolthole Index

Ravalli County, Montana

Building permits, zoning and septic rules in Ravalli County, Montana

69Index Score / 100
#16 of 56 in Montana

Unincorporated Ravalli County, Montana does not require a county building permit for a single-family home; state building permits apply to non-exempt construction12. Ravalli County enforces adopted citizen-initiated zoning districts, whose standards vary by parcel3. Ravalli County Environmental Health issues septic permits, with approval required before foundation work for a new occupied building using an on-site wastewater system45.

At a glance

Building permit
No county permit for a single-family home; non-exempt buildings need a state permit12
Zoning
Citizen-initiated district standards vary by district3
Septic permit
County approval required before foundation work for a new occupied building using an on-site wastewater system45
RV living
No general private-land rule confirmed; ask Planning about the parcel's district6
Tiny home
No general occupancy rule confirmed; district standards may apply6
Minimum lot size
May be set by the applicable citizen-initiated zoning district7
Septic soil suitability
Only 1.1% of soils avoid severe limits for a conventional drain field8
Owner-builder exemption
Qualifying owners have a state contractor-licensing exemption, subject to resale limits9

Who to call

Zoning

Ravalli County Planning Department

Land-use planning, subdivision review, zoning questions and floodplain management

406-375-6530

planning@rc.mt.gov

215 S 4th Street, Suite F, Hamilton, MT 59840

Septic permits

Ravalli County Environmental Health

Wastewater-system permits, site evaluations and public drinking-water administration

406-375-6565

rceh@rc.mt.gov

215 South 4th, Suite D, Hamilton, MT 59840

Contact details are copied from each office’s official page and were checked against it on October 11, 2026.

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

A single-family home in unincorporated Ravalli County does not need a county building permit, and Montana exempts residential buildings containing fewer than five dwelling units from state building permits except when serving transient guests12. Non-exempt construction needs a state building permit before work starts unless a certified local program has jurisdiction210. Ravalli County is not listed as a certified county building-code program; areas outside certified local jurisdictions fall under the State Building Codes Bureau11. Separate electrical, plumbing or mechanical permits may still apply to an exempt house12.

Who issues building permits in Ravalli County, Montana?

Ravalli County has no county building department issuing residential building permits1. The Ravalli County Planning Department handles land-use planning, subdivision review and floodplain management; reach Planning at 406-375-6530 or planning@rc.mt.gov13. For non-exempt work outside certified local jurisdictions, submit construction plans and the Building Permit/Plan Review Application to the Montana Building Codes Program, resolve review comments and pay the required fees before issuance1112. Ravalli County Environmental Health separately issues on-site wastewater permits and conducts site evaluations4.

Does Ravalli County have zoning?

Unincorporated Ravalli County has citizen-initiated zoning districts (CIZDs), with different standards in each district; adopted districts are enforceable by the county1415. County zoning resources include a district map and recorded documents, and land shown as unzoned is outside a CIZD with no CIZD development standards16. A district may restrict lot size or future subdivision; in the Yerian-Mihara Voluntary Zoning District, all residences, structures and buildings must be at least 75 feet from property lines717. Ask Planning to identify the parcel’s district and applicable standards; the recorded version in the Clerk and Recorder’s Office controls over differing electronic documents133. Inside Hamilton and Stevensville, municipal zoning applies1819. County Environmental Health still handles on-site wastewater permits, and Hamilton additionally requires Public Works permission and prohibits permanent private septic systems420.

How do septic permits work in Ravalli County?

Ravalli County Environmental Health is the county authority for wastewater-system permits4. A permit is required to install, alter, repair, use or connect to a wastewater system, and every new occupied building using an on-site wastewater system needs approval before any foundation is poured or non-concrete footing is installed5. Applications may be delivered in person or sent by fax, email or mail; every owner of record must sign, and the application needs a legal property address21. Fees must be paid before review, including a non-refundable $50 processing portion for listed wastewater applications and a $250 permit fee for a qualifying standard trench system22. Only 1.1% of Ravalli County soils avoid severe limitations for a conventional drain field, so settle septic feasibility before fixing the house site8.

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

We could not confirm a general rule for full-time RV or tiny-home occupancy on private land in unincorporated Ravalli County; ask the Planning Department about the parcel’s citizen-initiated zoning district and intended use613. We also could not confirm countywide minimum dwelling size, manufactured-home occupancy, lot coverage or building height rules; district standards vary6. A new occupied building using an on-site wastewater system needs county approval before foundation work5. Campgrounds, RV parks and mobile-home parks renting or leasing spaces require subdivision review23. Within regulated parks, mobile homes and attached structures must be at least 25 feet from public roadway easements, 15 feet from park boundaries and 10 feet from the directly serving roadway and other mobile homes or attached structures; detached structures have corresponding setbacks24. Those park-development standards do not establish permission to occupy an RV on an individual private parcel25.

What are the steps to build a home in Ravalli County, Montana?

  1. Ask the Planning Department whether the parcel lies in a citizen-initiated zoning district and what standards apply there613.
  2. Confirm whether the project is exempt from the state building permit; non-exempt buildings require a state permit unless a certified local program has jurisdiction2.
  3. Apply to Ravalli County Environmental Health for the on-site wastewater-system permit before pouring a foundation; every owner of record must sign, and the application needs a legal property address215.
  4. If the wastewater system is within 300 feet of a delineated floodplain, obtain Planning's floodplain determination before the septic permit can issue2613.
  5. Pay the wastewater fees before review and complete any required site evaluation, groundwater monitoring, non-degradation analysis and design work2221.
  6. Arrange the wastewater-system inspection before covering the installation with fill27.

What should you check before buying land in Ravalli County?

Settle wastewater feasibility before choosing the house site: only 1.1% of Ravalli County soils avoid severe limitations for a conventional drain field, and Environmental Health may require site evaluation or groundwater monitoring821. Confirm district boundaries and land-division limits with Planning713. Standard subdivision review applies when no exemption fits; the agricultural subdivision exemption requires exclusive agricultural use of the created parcel, with full exemption criteria and sanitation requirements still needing review2829. Projects in the regulatory 100-year floodplain require a county floodplain application; ask Planning for the current project classification and fee303113. For a new well, Montana’s permit exception may cover use of 35 gpm or less and no more than 10 acre-feet annually; beginning in 2026, file a Notice of Intent with DNRC before using water under that exception32. Ravalli County’s effective property-tax rate is about 0.5%, with a median annual bill of about $2,3033334.

Watch-outs

  • A building-permit exemption does not settle zoning, septic, floodplain, electrical, plumbing or mechanical requirements1035.
  • The recorded CIZD document in the Clerk and Recorder’s Office supersedes a differing electronic copy; read the final district standards before designing the project3.
  • Do not cover a department-designed wastewater system before inspection; the county may require the fill to be removed at the applicant's expense27.

Sources

  1. Montana DLI Building Codes - Building Permit FAQ (2026 county census)
  2. bsd.dli.mt.gov, quoted and re-checked
  3. Zoning | Ravalli County, MT, quoted and re-checked
  4. Environmental Health, quoted and re-checked
  5. Ravalli County Subsurface Wastewater Treatment and Disposal Regulations, quoted and re-checked
  6. Citizens Guide to Citizen Initiated Zoning Districts, quoted and re-checked
  7. A Citizens Guide to Subdividing Land in Ravalli County, quoted and re-checked
  8. 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
  9. Montana Code Annotated, Title 37, Chapter 45, Construction Contractors (Montana statewide rule), quoted and re-checked
  10. bsd.dli.mt.gov, quoted and re-checked
  11. Certified City, County and Town Programs, quoted and re-checked
  12. Building Permits (Montana statewide rule), quoted and re-checked
  13. Ravalli County Planning Department (ravallicounty.gov)
  14. Zoning, quoted and re-checked
  15. Zoning | Ravalli County, MT - Official Website, quoted and re-checked
  16. Citizens Guide to Citizen Initiated Zoning Districts, quoted and re-checked
  17. Yerian-Mihara Voluntary Zoning District, quoted and re-checked
  18. Hamilton: Hamilton Municipal Code § 17.08.090, R-1 District (Ravalli County), quoted and re-checked
  19. Town of Stevensville: Stevensville Code of Ordinances, Sec. 10-231 Residential chart footnotes (Ravalli County), quoted and re-checked
  20. Hamilton: Ravalli County Home Buyer's Guide to Septic Systems (Ravalli County), quoted and re-checked
  21. Septic Permits, quoted and re-checked
  22. Ravalli County Environmental Health Department Fee Schedule, quoted and re-checked
  23. Ravalli County, Montana Subdivision Regulations, quoted and re-checked
  24. Ravalli County, Montana Subdivision Regulations, quoted and re-checked
  25. Ravalli County Subdivision Regulations, quoted and re-checked
  26. Septic Permits, quoted and re-checked
  27. Ravalli County Subsurface Wastewater Treatment and Disposal Regulations, quoted and re-checked
  28. A Citizens Guide to Subdividing Land in Ravalli County, quoted and re-checked
  29. Citizens Guide to Subdividing Land in Ravalli County, quoted and re-checked
  30. Floodplain Permit Application, quoted and re-checked
  31. 2023 Planning Department Fee Schedule, quoted and re-checked
  32. Exempt Well Updates and Information (Montana statewide rule), quoted and re-checked
  33. Effective property tax rate: Bolthole Index county data
  34. Median property tax bill: Bolthole Index county data
  35. Montana Building Codes Program, 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

Unlike 4 of its 6 neighbors, Ravalli County requires no county building permit for a home.

RuleRavalli CountyGranite CountyDeer Lodge CountySilver Bow CountyMissoula CountyMineral CountyBeaverhead County
Building permitNot requiredLimitedRequiredRequiredRequiredNot requiredNot required
County zoningYesYesYesYesYesNoNo
Septic permitsRCEHTri-County SanitarianAnaconda-Deer Lodge County Env. Health Dept.Butte-Silver Bow Env. Health Div.Missoula City-County Health Dept.County Env. Health & PlanningBeaverhead County

County locator

Ravalli County in Montana

69
County map
Ravalli County highlighted among the Montana counties · colored by Index score

How Ravalli County scores

Seclusion83100% ev.
Self-Sufficiency44100% ev.
Admin Boringness6690% ev.
Durability42100% ev.
Property Autonomy83100% ev.
Carry Cost55100% ev.

Evidence strength: 98%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$614kTypical home
0.5%Property tax
$9,096Land / acre
29.2"Annual rain
14.7% of yrsSevere drought
0.5 / yr (+0.4)Mid-century 100°F days
18.2 daysMid-century dry spell
1.65" (+7.5%)Mid-century 1-day rain
1.24×Wildfire change factor
100%Forward climate coverage
$1,810Home insurance / yr
2.4% / yrInsurance growth
1.22%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
8,905People within 30 min
171,106People within 2 hr
20,064Radius comparison (15 mi)
20People / sq mi
74.3%Federal land
22.4%Land at 15% slope or less
1.1%Soils rated "not limited" for septic (strict USDA rating)
15,063 acWorkable land screen
67.3%Wooded land
29.9 tonsBiomass / forest ac
40.5°FAvg temp

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Cities and towns in Ravalli 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 Darby · Town of Pinesdale

Answers from the rulebook for Ravalli County

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

Ravalli County rules

  • Local zoningVaries (with conditions)

    Aggregate local zoning across Ravalli County, including county-enforced Citizen-Initiated Zoning Districts and any separately administered municipal zoning; this claim does not attribute municipal ordinances to the county.

    • Ravalli County zoning is district-specific rather than established by the cited page as uniform countywide zoning.
    • A CIZD requires at least 60% of freeholders in the proposed district to sign a petition and the district must be at least 40 acres.
    • If adopted, the district is enforceable by Ravalli County.
    • The county zoning page lists numerous recorded CIZDs and states that its electronic documents are only a resource; the recorded version in the Clerk and Recorder's Office supersedes any differing electronic document.
    • The cited county page does not independently establish the zoning rules of incorporated municipalities.

    minimum freeholder support for CIZD petition: >= 60 percent · minimum CIZD area: >= 40 acres

    “Text of recorded documents pertaining to existing Citizen-Initiated Zoning Districts is available. Please note that there may be multiple resolutions included in the permanent files (one creating district boundaries, one to create the Planning and Zoning Commission, and one passed by the County Commissioners.) The final standards for a district may not be found at the beginning of a document.”
    3 more reviewed findings on this topic
    • Varies (with conditions) — Local zoning aggregated across Ravalli County, especially Citizen-Initiated Zoning Districts.
      “Each CIZD has a different set of Standards.”
    • Varies (with conditions) — Aggregate local-zoning conclusion for Ravalli County, including applicable citizen-initiated zoning districts.
      “Each CIZD has a different set of Standards.”
    • Varies (with conditions) — Ravalli County land-use controls, including citizen-initiated zoning districts; the countywide result aggregates district-specific zoning and does not determine separate municipal ordinances.
      “Text of recorded documents pertaining to existing Citizen-Initiated Zoning Districts is available.”
  • Zoning districtsPublished (with conditions)

    Citizen-Initiated Zoning Districts within Ravalli County

    • The official guide states that Ravalli County had 41 CIZDs as of 2022.
    • Each CIZD has different standards, and County Planning addresses interpretation questions case by case.
    • The zoning page provides recorded documents and a CIZD map.
    • The separate subdivision guide states that properties shown as unzoned are not within a CIZD and no CIZD development standards apply.
    • The source does not establish a single countywide zoning ordinance outside CIZDs.
    • The guide identifies planning jurisdictions of Darby, Hamilton, Pinesdale, and Stevensville for subdivision inquiries, but does not itself establish their separate zoning ordinances.

    number of CIZDs: 41 districts (As of 2022.) · minimum freeholder support to create CIZD: >= 60 percent · minimum CIZD size: >= 40 acres

    “As of 2022, Ravalli County has 41 CIZDs. Each CIZD has a different set of Standards. Because CIZD Standards vary widely across the 41 districts, Ravalli County Planning addresses questions or interpretations of CIZD standards on a case by case basis.”
    One more reviewed finding on this topic
  • Minimum lot sizeDistrict specific (with conditions)

    Properties within applicable Ravalli County Citizen-Initiated Zoning Districts.

    • The source identifies minimum lot size or restrictions on future subdivision as possible CIZD standards; requirements vary by district.
    “Minimum lot size or restrictions on future subdivision.”
  • SetbacksSpecified

    Mobile homes and detached structures located within county-regulated mobile-home or RV parks and related subdivisions.

    • The cited setbacks apply specifically to mobile-home parks and RV parks governed by Chapter 12, § 12-11(C) of the Ravalli County Subdivision Regulations, not necessarily to every dwelling or structure in Ravalli County.
    • The regulations state an effective date of June 4, 2012.
    • The parks must comply with applicable MDEQ and MDPHHS rules and required subdivision review.

    mobile home or attached structure distance from public roadway easement: >= 25 feet · mobile home or attached structure distance from other park boundary lines: >= 15 feet · mobile home or attached structure distance from directly serving roadway: >= 10 feet · mobile home or attached structure distance from another mobile home or attached structure: >= 10 feet · detached structure distance from public roadway easement: >= 25 feet · detached structure distance from other park boundary lines: >= 15 feet · detached structure distance from directly serving roadway: >= 10 feet · detached structure distance from any other mobile home or attached structure: >= 10 feet

    “Mobile homes, including attached structures, such as awnings or carports, shall be located at least twenty-five (25) feet from any public roadway easement, fifteen (15) feet from other boundary lines of the park, ten (10) feet from the roadway that directly serves it, and ten (10) feet from any other mobile home or its attached structures.”
    2 more reviewed findings on this topic
    • Specified — Mobile homes and detached structures within county-regulated mobile-home or RV parks in Ravalli County.
      “Mobile homes [...] shall be located at least twenty-five (25) feet from any public roadway easement, fifteen (15) feet from other boundary lines of the park”
    • District specific (with conditions) — Residences, structures, and buildings within the recorded Yerian-Mihara Voluntary Zoning District in Ravalli County.
      “All residences, structures, and buildings shall be setback from property lines at least 75 feet.”
  • Living in an RVLimited

    RV parks, campgrounds, and mobile-home parks created by rent, lease, or other conveyance under Ravalli County subdivision regulations; this does not establish a rule for a single RV on an ordinary private parcel.

    • These uses are subdivisions requiring review and approval by the Board of County Commissioners before any portion may be rented, leased, or sold or the land altered to enable rent, lease, or sale.
    • Proposals with six or more total spaces or units are reviewed under Chapter 3; proposals with five or fewer are reviewed under Chapter 4.
    • If two or more RV spaces or campsites are placed on a parcel, the proposal constitutes an RV park or campground under MDEQ regulations and must comply with applicable MDEQ requirements, including approved on-site water supply and/or on-site solid-waste disposal under Title 76, Chapter 4, MCA.
    • Campgrounds, mobile-home parks, and RV parks must also comply with applicable MDEQ and MDPHHS rules.
    • The subdivision regulations state an effective date of June 4, 2012.
    • Applicable on-site wastewater systems must follow Ravalli County Wastewater Treatment and Disposal Regulations.
    “The applicant shall install all required improvements before renting, leasing, selling or otherwise occupying any portion of the subdivision.”
  • Who permits septicCounty

    On-site wastewater treatment and disposal permitting and site evaluations in Ravalli County

    • Ravalli County Environmental Health administers the county wastewater permit and site-evaluation services.
    • Subdivision-related DEQ review may also apply where applicable.
    “Services: Issuing wastewater (sewage) treatment and disposal permit Conducting site evaluations for onsite sewage disposal permits”
    One more reviewed finding on this topic
    • County — Administration and enforcement of Ravalli County subsurface wastewater regulations and wastewater-system permits.
      “Except as provided herein, the Ravalli County Board of Health delegates authority to administer and enforce these Regulations to the Ravalli County Environmental Health Department.”
  • Septic permitRequired

    Installation, alteration, repair, utilization, or connection to wastewater systems and new occupied buildings in Ravalli County.

    • No person may install, alter, repair, utilize, or connect to a wastewater system or replacement system unless a wastewater-system permit has been issued.
    • The Department is the only entity that may issue a wastewater-system permit for any wastewater system in Ravalli County.
    • A new wastewater-system permit is required for all new occupied buildings and must be approved before pouring any part of a foundation or installing non-concrete footings or foundations.
    • The permitting process includes site evaluation, groundwater monitoring when required, non-degradation analysis, and system design with detailed layout.
    • Approved municipal or sewer-district systems designed under DEQ Circular DEQ-2 are outside these county regulations.
    “A New Wastewater System Permit is required for all new Occupied Buildings.”
  • Septic inspectionRequired

    Wastewater-system installation inspections and final approval in Ravalli County.

    • For systems designed by the Department, inspection must occur before covering the installation with fill dirt.
    • A certified installer may inspect only when authorized and arranged in advance by the Department, and must submit labeled drawings and a signed compliance statement within seven days after completion.
    • If compliant, the Department signs the inspection form and issues final approval.
    • If noncompliant, the system must be modified and re-inspected, with modification and inspection fees set by the fee schedule.
    • If the system is covered before final inspection or Department approval, the applicant may have to remove the fill at the applicant’s cost.
    • For consultant-designed systems, the designer or another qualified inspector must provide written verification and a signed as-built drawing within 60 days; the inspector must be a professional engineer or registered sanitarian.
    • The January 2026 fee schedule lists a $100 re-inspection fee after failure of the final inspection.

    re-inspection after failed final inspection: 100 USD · installer drawing and signed statement deadline: 7 days (after completion of the system) · consultant-designed as-built drawing deadline: 60 days (after completion of the project)

    “A Department sanitarian, or as described further below, a certified installer, shall inspect the Wastewater System installation prior to covering with fill dirt.”
  • Agricultural exemptionConditional

    Subdivision exemption where the created parcel is used exclusively for agricultural purposes.

    • The county guide identifies agricultural use as a common exemption, but the full exemption criteria and sanitation requirements must still be reviewed.
    • Other listed exemptions include lot aggregation or boundary relocation, family transfer, mortgage survey/security for construction financing, townhouse lots, and condominiums.
    “Agricultural exemption (in which the created parcel is used exclusively for agricultural purposes)”
    One more reviewed finding on this topic
    • Available (with conditions) — Subdivision exemptions for parcels used exclusively for agricultural purposes.
      “Common exemptions include: a. Agricultural exemption (in which the created parcel is used exclusively for agricultural purposes)”
  • Subdividing landRegulated (with conditions)

    Subdivision applications in Ravalli County.

    • The county page provides preliminary-plat, sufficiency-review, element-review, variance, and utility-availability forms.
    • Subdivision requirements may change through pending amendments to the county subdivision regulations.
    • Environmental Health reviews subdivisions through Montana DEQ.
    “Subdivision Preliminary Plat Application Form (Revised 06-21-2024)”
    One more reviewed finding on this topic
  • Building in a floodplainRequired

    Proposed projects within Ravalli County's regulatory 100-year floodplain.

    • Submit two copies of the completed joint application and a $500 fee.
    • Provide adjacent-owner information, copies of other permits, a detailed scaled site plan, fill calculations, and a statement addressing Chapter 4 minimum development standards.
    • Engineered-design statements must be certified and signed by a licensed engineer.
    • Residential structures require one-foot-contour topography, floodplain elevation calculations, fill calculations/specifications, and an elevation certificate.

    application fee: 500 USD · regulatory floodplain: 100-year

    “The following requested information applies to all proposed projects within the regulatory 100-year floodplain.”
    One more reviewed finding on this topic
    • Required — Proposed wastewater treatment systems within 300 feet of a delineated floodplain.
      “If the proposed wastewater treatment system is within 300 feet of a delineated floodplain, a floodplain determination is required prior to issuance of the permit. Please contact the Ravalli County Planning Department (375-6530) for a floodplain determination.”
  • Permit feesPublished (with conditions)

    Ravalli County Planning Department floodplain, zoning, and related application fees

    • The cited schedule is marked effective October 24, 2023.
    • Final plat, variance, and amended application fees are charged under the current fee schedule in place at submission.
    • Extraordinary subdivision-processing costs are the applicant’s responsibility.
    • The schedule does not establish building-code permit fees.

    minor floodplain permit: 200 USD · major floodplain permit: 650 USD · citizen initiated zoning request: 575 USD · citizen initiated zoning district variance: 515 USD

    “Floodplain Permit (Minor Project) $ 200 [...] Floodplain Permit (Major project) $ 650 [...] Citizen Initiated Zoning Request $ 575 Citizen Initiated Zoning District Variance $ 515 [...] * Effective October 24th, 2023”
    One more reviewed finding on this topic
  • Permit processPartial

    Ravalli County wastewater permit applications.

    • Applications may be submitted in person, by fax, email, or mail.
    • Applications must be signed by all property owners on record.
    • A legal property address is required.
    • Depending on DEQ approval and site conditions, site evaluation, groundwater monitoring, floodplain determination, and non-degradation analysis may be required.
    “Applications may also be faxed, emailed, or mailed.”
  • County-wide zoningPresent

    Ravalli County has zoning through district-based Citizen-Initiated Zoning Districts (CIZDs) under 76-2-101 MCA; coverage is not countywide.

    Ravalli County Zoning ↗Scouted from the county site, not yet independently re-checked

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.”
    2 more reviewed findings on this topic
    • Limited — State building permits for projects in or affecting Ravalli County.
      “A state building permit is required for any state owned agency or non-exempt building”
    • Limited — Building permits for single-family residences and other covered construction in Montana, including unincorporated Ravalli County unless a local certified program applies.
      “residential buildings containing less than five dwelling units (except when serving transient guests)”
  • Owner-builder exemptionAvailable

    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.

    • The exemption does not apply to an owner otherwise covered by the chapter who constructs a residence on the owner's property intending and for the purpose of promptly selling the improved property.
    • For an owner working on the owner's property, the resale exception does not apply if the owner has continuously occupied the property as the owner's primary residence for at least the last 12 months.
    • This is an exemption from the construction-contractor licensing chapter; it does not itself exempt a project from applicable building, electrical, plumbing, mechanical, or inspection requirements.

    primary-residence occupancy period for resale exception: >= 12 months (The statute states the owner must have continuously occupied the property as the owner's primary residence for at least the last 12 months.)

    “(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.”
    4 more reviewed findings on this topic
    • Adopted — Residential and commercial buildings in Ravalli County that are under the Montana state building-code jurisdiction.
      “the program is responsible for adopting a uniform state building code, which is enforced statewide for residential and commercial buildings across Montana.”
    • Partial — Montana building-code adoption applicable to projects in Ravalli County.
      “These local building code enforcement programs must be certified by the BC Program.”
    • Adopted (with conditions) — State building-code jurisdiction in Ravalli County areas outside certified local-government programs
      “Below is a list of all certified local government building code jurisdictions and certified building code inspectors: [...] All other areas are under the jurisdiction of the State Building Codes Bureau”
    • 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 subject to state building-code enforcement in Ravalli County, with separate local inspection programs in Hamilton, Darby, and Stevensville

    • Outside Hamilton, Darby, and Stevensville, the state has jurisdiction according to the Ravalli County official plan-review document.
    • The state FAQ identifies state building-code inspectors and states that an inspector is assigned during plan review.
    • Inspection requirements depend on whether the project is subject to a building permit and applicable code exemptions.
    “Ravalli County Building Codes: All commercial buildings are subject to state building codes. There are city building inspectors for Hamilton, Darby, and Stevensville. Outside of these areas, the state has jurisdiction.”
    One more reviewed finding on this topic
    • Limited — Buildings and other projects requiring permits under Montana state building-code jurisdiction; certified local governments may perform inspections within their certified jurisdictional areas.
      “The BC Program establishes and enforces statewide codes by issuing permits and performing 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.”
  • Manufactured homesAllowed (with conditions)

    Manufactured housing used as residential housing within Montana municipalities that exercise zoning powers under MCA Title 76, chapter 2, part 3.

    • Municipal zoning regulations may not treat manufactured housing or factory-built housing units differently from other residential units.
    • Placement remains subject to applicable municipal zoning districts, permits or variances where required, building-code requirements, and other applicable health and safety rules.
    • The statute defines manufactured housing as a single-family dwelling built offsite in a factory and compliant with applicable prevailing HUD standards; a manufactured home does not include a mobile home or housetrailer as defined in 15-1-101, MCA.
    • The source addresses municipal zoning and does not establish unrestricted occupancy on unzoned or county land statewide.
    “Zoning regulations adopted under this part may not treat manufactured housing or factory-built housing units differently from any other residential units.”
  • Accessory dwellingsAllowed (with conditions)

    Accessory dwelling units in jurisdictional areas where a Montana county has established zoning regulations under MCA Title 76, chapter 2, part 2.

    • The county zoning regulations must allow at least one accessory dwelling unit by right on a lot or parcel containing a single-family dwelling.
    • The unit may be attached, detached, or internal.
    • The county may not require owner occupancy, a familial, marital, or employment relationship between occupants, or impact fees; private restrictive covenants remain possible but cannot be required as a permit, license, or use condition.
    • A county may charge up to $250 for a one-time ADU application-review fee, in addition to usual building fees.
    • Applicable building codes, fire codes, and public-health and safety regulations still apply.
    • The county may require expedited sanitation review for an ADU on a parcel with existing public water and wastewater capacity; the 15-day expedited-review provision terminates September 30, 2029.
    • The statute applies to a county that exercises zoning powers; it does not itself create county zoning where none exists.

    maximum one-time application-review fee: <= 250 USD (Usual building fees may also be required.) · expedited sanitation review: 15 days (Parcel must have existing public water and wastewater service with capacity.)

    “In jurisdictional areas where the board of county commissioners has established zoning regulations under this part, the regulations must allow a minimum of one accessory dwelling unit by right on a lot or parcel that contains a single-family dwelling.”
    One more reviewed finding on this topic
    • Allowed (with conditions) — Accessory dwelling units in Montana municipalities that exercise zoning powers under MCA Title 76, chapter 2, part 3.
      “A municipality shall adopt regulations under this chapter that allow a minimum of one accessory dwelling unit by right on a lot or parcel that contains a single-family dwelling.”
  • 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.”
    One more reviewed finding on this topic
    • 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 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.”
  • 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.

  • Minimum dwelling size — Minimum floor area or dwelling size in unincorporated Ravalli County.
  • Lot coverage — Lot coverage in Ravalli County.
  • Building height — Building height in Ravalli County.
  • Camping on your land — Temporary camping in Ravalli County.
  • Tiny homes — Tiny-home occupancy in Ravalli County.
2 more unanswered
  • Off-grid sanitation
  • Mandatory utility hookup

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.

Water rights & wells in Ravalli County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from Montana’s water agency.

Closed to new supply

New water supply here generally requires a permit, an offset, or buying an existing right — a household well is not automatic.

Household wellExempt up to a limit

Montana's exempt-well exception (85-2-306 MCA) was tightened after Upper Missouri Waterkeeper v. DNRC (2024), and from Jan 1, 2026 appropriators must file a Notice of Intent with DNRC before putting exempt groundwater to use.

Limit: 35 gpm or less AND ≤10 acre-ft/yr; a combined appropriation exceeding 10 acre-ft needs a permit regardless of flow rate

Montana DNRC — Water Rights Permit Exceptions (Exempt Wells) ↗

Prior-appropriation state (first in time, first in right). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the Montana state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Ravalli County, Montana

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

Ravalli County scores 69/100 on the Bolthole Index, a strong county profile. Its strengths: a stronger property-autonomy legal backdrop and sparse surroundings — about 8,905 people within a 30-minute drive. Watch-outs: elevated current hazard exposure.

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

Ravalli County does not require a county building permit for a home in unincorporated areas, and it enforces county zoning. Onsite septic is permitted by Ravalli County Environmental Health (RCEH). 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 Ravalli County?

Living in an RV on your own land in Ravalli County is limited to specific cases: Statewide rule. RV, camper-trailer, and other trailer overnight use for general recreation on legally accessible Montana state trust land administered by DNRC. A Conservation License is required for dispersed camping on state trust land. RV or trailer camping must be within 50 feet of a customary access point; motorized vehicles must be parked within 50 feet of a customary access point, and the camper or trailer may not be set up farther away by driving beyond that point. Confirm with the county before relying on it.

How much does land cost in Ravalli County, Montana?

Land in Ravalli County runs about $9,096 per acre, based on the latest county data.

What is the water situation in Ravalli County?

Ravalli County gets about 29.2" of rain a year, with severe drought in roughly 14.7% of years. On water rights, Ravalli County lies in the Larson Creek Controlled Groundwater Area — Bitterroot Valley CGWA; new groundwater development requires a DNRC permit rather than the exempt-well exception..

How remote is Ravalli County?

A representative private-land location has about 8,905 people within a 30-minute drive and 171,106 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

How Ravalli compares in Montana

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