Bolthole Index

Powell County, Montana

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

62Index Score / 100
#29 of 56 in Montana

Unincorporated Powell County, Montana requires a county Development Certificate for every new residential or commercial structure; the City of Deer Lodge is outside the county Planning Department's service area12. Montana's separate state building permit applies only to non-exempt work under state jurisdiction; private homes with four or fewer units and farm or ranch buildings are among the exemptions3. A Certificate of Subdivision Approval does not replace the required local drainfield permit4.

At a glance

County development permit
Required for every new residential or commercial structure outside the City of Deer Lodge12
State building permit
Conditional; private homes with four or fewer units and farm or ranch buildings are exempt3
Zoning
Yes; administered by the Powell County Planning Department outside Deer Lodge52
Septic permit
A drainfield permit is required through the local health department64
RV or tiny-home living
Not confirmed; ask Planning and Tri-County Environmental Health before relying on either use56
Well water rights
A state Beneficial Water Use Permit is required unless the proposed groundwater use qualifies for an exception7
Floodplain development
A county permit is required for new projects or expansions in mapped floodplains8
Conventional septic soils
Only 4.9% of soils lack severe drainfield limitations9

Who to call

Building permits

Powell County Planning Department

Development Certificates, conditional use permits, zoning, subdivisions and county floodplain applications outside the City of Deer Lodge

(406) 846-9795

planning@powellcountymt.gov

409 Missouri Ave., Suite 114, Deer Lodge, MT 59722

Septic permits

Tri-County Environmental Health

Septic systems, subdivisions of land, well-water sampling and well-drilling permits in Powell County

(406) 563-4066

409 Missouri Ave., Suite 114, Deer Lodge, MT 59722

Floodplain permits

Powell County Planning Department — Floodplain Administration

Floodplain determinations and Floodplain Development Permits in Powell County

406-846-9729

planning@powellcountymt.gov

409 Missouri Ave., Suite 114, Deer Lodge, MT 59722

Contact details are copied from each office’s official page and were checked against it on October 10, 2026.

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

Every new residential or commercial structure in unincorporated Powell County needs a county permit called a Development Certificate, or a Conditional Use Permit when the proposed use requires one12. The county process does not cover the City of Deer Lodge, which has its own permitting authority2. Do not confuse that local land-use approval with Montana's state building-code permit: the state permit applies to non-exempt work under state jurisdiction, but private homes and apartments with four or fewer units, farm and ranch buildings, and private storage buildings and garages are exempt3. Montana has adopted a uniform state building code, with certified local programs enforcing within their jurisdictions and the state program covering the rest10. A project may therefore need the county Development Certificate even when the structure is exempt from the state building permit13.

Who issues Powell County building permits, and how do you reach them?

Start with the Powell County Planning Department at 409 Missouri Ave., Suite 114, Deer Lodge, MT 59722; call (406) 846-9795 or email planning@powellcountymt.gov2. Planning staff administers the county's zoning, subdivision and floodplain rules and reviews applications for consistency with the Growth Policy2. For non-exempt work under state jurisdiction, submit construction plans and the state application; review averages three weeks, and the permit follows written resolution of comments and payment of the fees11. State inspections apply to projects that require state permits, while a certified local jurisdiction may inspect within its certified scope12. For a state-administered permit, the plan-review charge is 35% of the building-permit fee, and both charges must be paid before issuance; certified local governments may set their own fees13.

Does Powell County have zoning?

Powell County administers Zoning & Development regulations, subdivision regulations and a Floodplain Ordinance through the Planning Department, with Deer Lodge excluded from the department's county service area52. Montana law authorizes county commissioners with an adopted growth policy to adopt zoning for all or part of their jurisdiction, so the parcel's mapped district matters14. Powell County's specific rules for RV occupancy, tiny homes, minimum dwelling size, minimum lot size, setbacks, lot coverage and building height could not be confirmed from the reviewed material. Ask Planning for the parcel's zoning district and the current dimensional and use standards before choosing a house plan or placing an RV. A Development Certificate remains required for a new residential structure even if the proposal otherwise fits its district1.

How do septic permits work in Powell County?

Tri-County Environmental Health is the county-listed office for the Septic System Program, subdivisions of land, well-water sampling and well-drilling permits615. Call (406) 563-4066 and make an appointment because the county says sanitarians are commonly in the field15. Montana requires a local health-department drainfield permit even when a property already has a Certificate of Subdivision Approval4. Before covered subdivision facilities requiring water or sewer are developed, the Certificate of Subdivision Approval identifies the potable-water source and wastewater-disposal method16. State sanitation review covers water supply, sewage disposal, solid waste and storm drainage for land divisions creating parcels under 20 acres, plus condominiums and recreational camping-vehicle and mobile-home parks regardless of parcel size17. Only 4.9% of Powell County soils are rated without severe limitations for a conventional drainfield, so resolve site feasibility early9.

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

We could not confirm Powell County's rules for long-term RV living, temporary camping on private land or tiny-home occupancy. Powell County does have zoning and requires a permit for any new residential structure, so a tiny home should go to Planning for parcel-specific review before purchase or placement51. An occupied RV or tiny home does not bypass sanitation review: a local drainfield permit is still required when a Certificate of Subdivision Approval exists, and Tri-County Environmental Health lists both septic systems and subdivisions among its programs415. Ask Planning about the proposed occupancy and zoning district, then ask Tri-County Environmental Health what wastewater solution can be approved on the site.

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

  1. Confirm the parcel is outside Deer Lodge and ask the Powell County Planning Department for its zoning district and the correct Development Certificate or Conditional Use Permit2.
  1. Have Tri-County Environmental Health evaluate the water and wastewater plan before fixing the house location; a local drainfield permit is required, and only 4.9% of county soils lack severe conventional-drainfield limitations49.
  1. If the parcel comes from a covered subdivision, confirm its Certificate of Subdivision Approval identifies an acceptable water source and wastewater method before developing facilities that require water or sewer16.
  1. Check flood status with Planning because new projects or expansions in a mapped floodplain require a Floodplain Development Permit8.
  1. Apply to Montana's Building Codes Program only if the work is within state jurisdiction and is not exempt; private homes with four or fewer units and farm or ranch buildings are among the state exemptions3.
  1. Determine whether the planned well use needs a Beneficial Water Use Permit or qualifies for a state exception, and obtain an MDT approach permit or right-of-way agreement before creating or modifying a driveway onto a state highway718.

What should you check before buying land in Powell County?

Put water, soils, slope, access and flood exposure ahead of the house design. A new or expanded groundwater use needs a Montana Beneficial Water Use Permit unless it qualifies for an exception7. Only 4.9% of Powell County soils lack severe limitations for a conventional septic drainfield, and only 29.7% of the land has a slope of 15% or less919. The county is 63% wooded and 55.9% federally owned, which can affect clearing assumptions and the amount of privately developable land around a parcel2021. A new or modified approach onto a Montana state highway needs an MDT approach permit or right-of-way agreement18. Development in a designated Special Flood Hazard Area requires local floodplain review, and Powell County Planning issues the local permit228. For carrying costs, the effective property-tax rate is about 0.7%, with a median annual bill around $1,8092324.

Watch-outs

  • A Powell County Development Certificate and a Montana state building permit are different approvals; a state-exempt private home may still need the county certificate13.
  • Only 4.9% of Powell County soils lack severe limitations for a conventional drainfield, so resolve septic feasibility before committing to a building site9.
  • The City of Deer Lodge has its own permitting authority and is outside the Powell County Planning Department's normal service area2.

Sources

  1. Powell County Planning Department - Permits & Applications (2026 county census)
  2. Powell County Planning Department (powellcountymt.gov)
  3. What is a Building Permit and What Good Does it Do?, quoted and re-checked
  4. Engineering Infrastructure & Subdivisions, quoted and re-checked
  5. Powell County Planning Department - Zoning & Development Regulations (2026 county census)
  6. Powell County Tri-County Environmental Health (2026 county census)
  7. Apply for Water Rights, quoted and re-checked
  8. Powell County Planning Department — Floodplain Administration (powellcountymt.gov)
  9. 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
  10. Current Codes, quoted and re-checked
  11. Building Permits, quoted and re-checked
  12. Montana Building Codes Program, quoted and re-checked
  13. bsd.dli.mt.gov, quoted and re-checked
  14. Montana’s 2019 Land Use & Planning Statutes (Montana statewide rule), quoted and re-checked
  15. Tri-County Environmental Health (powellcountymt.gov)
  16. Engineering Infrastructure & Subdivisions, quoted and re-checked
  17. Engineering Infrastructure & Subdivisions, quoted and re-checked
  18. Approach Manual for Landowners and Developers (Montana statewide rule), quoted and re-checked
  19. Share of land at 15% slope or less: Bolthole Index county data
  20. Wooded share of land: Bolthole Index county data
  21. Federal land share: Bolthole Index county data
  22. Stream Permitting (Montana statewide rule), quoted and re-checked
  23. Effective property tax rate: Bolthole Index county data
  24. Median property tax bill: Bolthole Index county data

Written October 10, 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, Powell County requires a building permit for a home.

RulePowell CountyLewis and Clark CountyMissoula CountyGranite CountyLake CountyTeton CountyDeer Lodge County
Building permitRequiredNot requiredRequiredLimitedLimitedNot requiredRequired
County zoningYesYesYesYesYesNoYes
Septic permitsTri-County Env. HealthLewis & Clark Public HealthMissoula City-County Health Dept.Tri-County SanitarianCounty Board of HealthCounty SanitarianAnaconda-Deer Lodge County Env. Health Dept.

County locator

Powell County in Montana

62
County map
Powell County highlighted among the Montana counties · colored by Index score

How Powell County scores

Seclusion85100% ev.
Self-Sufficiency32100% ev.
Admin Boringness4290% ev.
Durability56100% ev.
Property Autonomy83100% ev.
Carry Cost81100% 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 →

$337kTypical home
0.7%Property tax
$1,783Land / acre
26.1"Annual rain
15.9% of yrsSevere drought
0.3 / yr (+0.3)Mid-century 100°F days
16.4 daysMid-century dry spell
1.24" (+8.3%)Mid-century 1-day rain
1.24×Wildfire change factor
100%Forward climate coverage
$1,816Home insurance / yr
0.4% / yrInsurance growth
1.22%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
257,537People within 2 hr
1,506Radius comparison (15 mi)
3.1People / sq mi
55.9%Federal land
29.7%Land at 15% slope or less
4.9%Soils rated "not limited" for septic (strict USDA rating)
69,303 acWorkable land screen
63%Wooded land
27.8 tonsBiomass / forest ac
39.9°FAvg temp

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Cities and towns in Powell 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.

Answers from the rulebook for Powell County

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

Powell County rules

Montana rules that apply here

  • Building permitLimited

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

    • A state building permit is required before construction for certain types of new buildings and for certain alterations, additions, and repairs.
    • The state permit requirement does not apply to projects within the jurisdictional limits of a certified local government program; local requirements may apply there.
    • In the state's jurisdiction, state law exempts farm and ranch buildings; mining buildings on mining property; petroleum refineries and pulp and paper mills except office and shop buildings; residential buildings containing less than five dwelling units except when serving transient guests; and private garages and private storage buildings used for the owner's own use and not as part of a commercial enterprise or business.
    • Building permits must be issued on required projects before plumbing, mechanical, or electrical permits can be issued and before work authorized under those permits can start.
    “In Montana a state building permit is required prior to the start of construction for certain types of new buildings, and/or for alterations, additions, and repairs.”
    One more reviewed finding on this topic
    • Required — Certain new buildings, alterations, additions, and repairs in Powell County where state building-code jurisdiction applies.
      “A state building permit is required for any state owned agency or non-exempt building being built, remodeled, moved, or undergoing a change of occupancy, except for projects located within the jurisdictional limits of a local government program.”
  • 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.”
    2 more reviewed findings on this topic
    • Adopted (with conditions) — State building codes applicable in areas under the State Building Codes Bureau, including non-certified areas of Powell County.
      “All of the codes listed below are amended and adopted by: [...] International Building Code, 2024 Edition - Effective: September 26, 2026 [...] International Residential Code, 2024 Edition - Effective: September 26, 2026”
    • 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.”
    One more reviewed finding on this topic
    • Limited — State building-code inspections for projects requiring state permits in Powell County.
      “The BC Program establishes and enforces statewide codes by issuing permits and performing inspections. The program includes inspection and permitting for Building Codes (building, plumbing, electrical, and mechanical), Elevator, and Boiler programs..”
  • 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.”
  • Living in an RVLimited

    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.
    • On leased or licensed land, the stay limit is 2 days.
    • On unleased or unlicensed land, the stay limit is 16 days within a 30-day period.
    • Within a designated campground, the stay limit is 16 days within a 30-day period.
    • The local DNRC field office should be contacted to confirm whether land is leased.
    • Pets must be leashed or otherwise controlled.
    • Overnight horses must be restrained, may not remain in a stream riparian zone for more than one hour, and must use certified weed-seed-free feed.
    • Campfires are generally permitted within designated campgrounds and on unleased or unlicensed land but are not allowed on leased land.
    • Cutting firewood requires a separate permit from the local DNRC field office, and fireworks are not allowed on state land.
    • State Parks, Fishing Access Sites, and Wildlife Management Areas are managed by Montana Fish, Wildlife and Parks rather than under this DNRC camping page.

    RV/trailer distance from customary access point: <= 50 ft (Motorized vehicles must be parked within 50 feet; the page states the camper or trailer may not be driven farther to set it up.) · maximum stay on leased or licensed land: 2 days · maximum stay on unleased or unlicensed land: 16 days within a 30-day period · maximum stay within designated campground: 16 days within a 30-day period

    “TRAILER/RV etc. Camp within 50 ft of a customary access point. Motorized vehicles must be parked within 50 ft of a customary access point. You may not drive further to set up a camper or trailer. 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”
  • 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.”
  • Who permits septicMixed (with conditions)

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

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

    Drainfield installation associated with subdivision sanitation approvals in Montana, including Powell County where applicable.

    • A Certificate of Subdivision Approval does not eliminate the separate drainfield permit.
    • The permit is required from the local health department.
    “a drainfield permit is still required by the local health department.”
    One more reviewed finding on this topic
    • Required — Installation of a drainfield in Montana, including property already covered by a Certificate of Subdivision Approval.
      “Yes, even thought you have a COSA, a drainfield permit is still required by the local health department.”
  • 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 or expanded groundwater uses serving property in Powell County.
      “A Beneficial Water Use Permit is required for all new or expanded uses of surface water and groundwater unless the use falls under an exception to permitting requirements.”
    • 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.”
  • Mandatory utility hookupConditional

    Water and wastewater facilities for subdivisions in Montana, including Powell County where applicable.

    • A Certificate of Subdivision Approval identifies whether potable water is from a well, municipal water system, or cistern and where wastewater will be disposed.
    • A COSA must be issued before developing facilities that require sewer or water.
    “The COSA outlines what the use of the property is, such as residential or commercial. It also describes what the potable water source will be (well, municipal water system, cistern, etc) and where wastewater will be disposed (drainfield/septic system, municipal wastewater facility).”
  • Subdividing landLimited

    Statewide divisions of land creating parcels for sale or other transfer under the Montana Subdivision and Platting Act.

    • A subdivision generally consists only of parcels containing less than 160 acres that cannot be described as a one-quarter aliquot part of a United States government section.
    • The subdivision plat must show all parcels, whether contiguous or not.
    • The statutory definition includes resubdivisions and condominiums.
    • Certain divisions or aggregations are not subdivisions under the chapter but remain subject to survey requirements and applicable zoning regulations.
    • The statutory exemptions do not apply when the method of disposition is adopted for the purpose of evading the chapter.

    parcel threshold: < 160 acres (A parcel describable as a one-quarter aliquot part of a United States government section is excluded from the subdivision definition.)

    “subdivision comprises only those parcels containing less than 160 acres that cannot be described as a one-quarter aliquot part of a United States government section”
    2 more reviewed findings on this topic
    • Regulated (with conditions) — Subdivision sanitation approval applicable statewide, including Powell County where state subdivision law applies.
      “A Certificate of Subdivision Approval otherwise known as a COSA is sanitation approval from the Montana Department of Environmental Quality.”
    • Regulated (with conditions) — Subdivision sanitation review in Powell County and statewide Montana.
      “reviews divisions of land comprising less than 20 acres”
  • Driveway accessLimited

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

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

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

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

    Short-term rentals operated in Montana.

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

    application fee: 50 USD

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

    State building-permit fees for projects under Montana state jurisdiction.

    • The permit fee is calculated under IBC Section 109.2 as modified by ARM 24.301.138.
    • A plan-review fee equal to 35 percent of the building permit fee is added.
    • Both fees must be paid before issuance.
    • Certified local governments may establish their own permit fees and valuation methods.

    plan review fee: 35 percent of building permit fee

    “The plan review fee is 35 percent of the building permit fee”
    2 more reviewed findings on this topic
    • Published (with conditions) — State building-permit fees where the Montana Building Codes Program has jurisdiction.
      “A plan review fee must be paid in addition to the building permit fee. The plan review fee is 35 percent of the building permit fee as established in Table 109.2. Both the building permit fee and the plan review fee must be paid before a building permit will be issued.”
    • Variable (with conditions) — State building permit and plan-review fees for state-administered building permits.
      “The plan review fee is 35 percent of the building permit fee as established in Table 109.2.”
  • Permit processPublished (with conditions)

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

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

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

    “To obtain a state building permit, submit construction plans and a Building Permit/Plan Review Application to the Building Codes Program for review and approval.”
    2 more reviewed findings on this topic
    • Published (with conditions) — State building-permit application and plan-review process applicable where the Montana Building Codes Program has jurisdiction.
      “The plan review process begins when the plans and application are received in the office. The plan reviewer then calculates the valuation of the building and the necessary permit fees and screens the plans to determine if the plans, as submitted, are sufficient to do a plan review.”
    • Published (with conditions) — State building-permit application and plan-review process applicable where Montana retains jurisdiction.
      “To obtain a state building permit, submit construction plans and a Building Permit/Plan Review Application to the Building Codes Program for review and approval. Please use the checklist above to ensure your submittal is complete. Applicants are encouraged to contact the Bureau in the planning stages of their project. On average it takes three weeks for a plan to be reviewed. Plan review comment letters and the Building Permit/Plan Review fees are mailed or emailed to applicants. When all plan review comments have been satisfactorily answered in writing and the fees paid, the building permit is issued.”
  • 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.

  • Local zoning — Aggregate local zoning status across Powell County municipalities and unincorporated areas.
  • Zoning districts — Published zoning districts and district maps in Powell County.
  • Minimum dwelling size — Minimum dwelling size in Powell County.
  • Minimum lot size — Minimum lot size in Powell County zoning districts.
  • Setbacks — Zoning setbacks in Powell County.
7 more unanswered
  • Lot coverage
  • Building height
  • Camping on your land
  • Tiny homes
  • Septic inspection
  • Off-grid sanitation
  • Agricultural exemption

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 Powell County, Montana

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

Powell County scores 62/100 on the Bolthole Index, a solid county profile. Its strengths: deep seclusion — about 1,506 people within 15 miles and a stronger property-autonomy legal backdrop. Watch-outs: workable self-sufficiency basics (26.1″/yr rainfall).

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

Powell County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Tri-County Environmental Health (Anaconda-Deer Lodge, Granite, Powell). 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 Powell County?

Living in an RV on your own land in Powell 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 Powell County, Montana?

Land in Powell County runs about $1,783 per acre, based on the latest county data.

What is the water situation in Powell County?

Powell County gets about 26.1" of rain a year, with severe drought in roughly 15.9% of years.

How remote is Powell County?

A typical private-land location has about 1,506 people within 15 miles and 507,721 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

How Powell compares in Montana

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