Bolthole Index

Fergus County, Montana

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

69Index Score / 100
#18 of 56 in Montana

A typical single-family home in unincorporated Fergus County, Montana does not require a state building permit, but Fergus County still requires a development permit before construction12. The county permit identifies property, road and floodplain limitations, assigns a physical address and provides an encroachment permit when needed2. Fergus County Environmental Health handles septic administration3.

At a glance

Building permit
No state building permit for a typical single-family home outside Lewistown; county development permit still required12
Development permit
$50 and required before construction42
Zoning
Countywide zoning could not be confirmed; ask the Planning Office about the parcel5
Septic
Drainfield permit required through Fergus County Environmental Health36
RV living
Private-land residential occupancy rule could not be confirmed; ask the Planning Office and Environmental Health53
Tiny homes
No separate occupancy or minimum-size rule was confirmed; ask the Planning Office5
Owner-built storage
Owner-use private garages and storage buildings are exempt from the state building permit when not part of a business7
Water wells
A general individual-well permit rule could not be confirmed; ask Environmental Health before drilling3

Who to call

Planning & zoning

Fergus County Planning Office

Development permits, floodplain programs, addressing, mapping, GIS and land-use questions

(406) 535-9046

[email protected]

712 W. Main Street, Suite #101, Lewistown, MT 59457

Septic permits

Fergus County Health Department - Environmental Health

Septic applications, site-visit requests, as-built records, installers and site evaluators

406-535-9046

[email protected]

712 W. Main St #101, Lewistown, MT 59457

Roads & driveways

Fergus County Road and Bridge Department

County-road questions and right-of-way encroachment applications

406-535-5006

[email protected]

PO Box 878, Lewistown, MT 59457

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

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

A typical single-family residence in the part of Fergus County served by the State Building Codes Bureau is exempt from the state building permit18. The exemption also covers farm and ranch buildings and owner-use private garages or storage buildings that are not part of a commercial enterprise87. Other covered buildings, additions, alterations and repairs may need a state permit and inspections89.

Fergus County separately requires its development permit before any construction2. The county charges $50 for that permit and lists $500 when construction begins before the permit is obtained4. The practical answer is therefore not simply “no permit”: confirm the county development approval first, then determine whether the project type also falls within state building-permit jurisdiction28.

Who handles building and development permits in Fergus County?

Fergus County does not operate a certified county building-code program; the City of Lewistown is the certified local program, while other areas fall under the State Building Codes Bureau1. Start a rural project with the Fergus County Planning Office because its page lists development permits, floodplain programs, addressing, mapping and land-use issues among its services10. The county development permit is the step that identifies property, road and floodplain limitations, assigns a physical address and supplies an encroachment permit when needed2.

For a project that is not exempt from state building permitting, submit construction plans and the state Building Permit/Plan Review Application; approval follows satisfactory responses to plan-review comments and payment of fees, and separate trade permits may apply11. State plan review adds 35 percent of the building permit fee12.

Does Fergus County, Montana have zoning?

We could not confirm a countywide zoning ordinance for Fergus County, so do not treat a rural parcel as unrestricted5. Montana law allows a county that has adopted a growth policy to adopt zoning regulations, but that statewide authority does not prove that a particular Fergus County parcel is zoned13. The Fergus County Planning Office is the right first call for parcel-specific land-use questions, and its official page lists both land-use issues and a growth plan10.

The county page also describes a County Planning Board and a City-County Planning Board whose jurisdiction includes the City of Lewistown and a surrounding area of Fergus County10. Ask Planning to identify the parcel's exact jurisdiction before relying on assumptions about RV occupancy, tiny homes, setbacks, minimum dwelling size, lot size, lot coverage or building height; published countywide answers to those questions could not be confirmed5.

How do septic permits work in Fergus County?

Fergus County Environmental Health administers septic and subsurface wastewater matters and publishes the septic application and site-visit request, as-built materials, installer applications and site-evaluator applications314. A local drainfield permit is still required even when the property has a Certificate of Subdivision Approval6. The available county material does not state the complete inspection sequence, so ask Environmental Health when inspections or site visits must occur before covering any work3.

Only about 4% of Fergus County soils are rated without severe limitations for a conventional septic drain field, making early site evaluation especially important15. Montana DEQ also reviews sanitation for divisions of land smaller than 20 acres and reviews condominiums, recreational camping vehicle parks and mobile-home parks regardless of parcel size16. That state subdivision review covers water, sewage, solid waste and storm drainage, but it does not replace the local drainfield permit166.

Can you live in an RV or tiny home in Fergus County?

We could not confirm a Fergus County rule that allows or prohibits long-term RV occupancy on private land5. We also could not confirm a separate tiny-home occupancy rule, a countywide minimum dwelling size or a countywide setback schedule5. Ask the Fergus County Planning Office about the exact parcel and proposed use before buying or moving a unit onsite; the office handles land-use issues10.

Sanitation remains a separate question from land use: Fergus County Environmental Health administers septic matters, and a local drainfield permit remains required even when a Certificate of Subdivision Approval exists36. A proposed recreational camping vehicle park or mobile-home park also enters Montana DEQ subdivision review regardless of parcel size16. Rules for camping at Montana Fish, Wildlife & Parks public-use sites do not answer whether someone may occupy an RV on private Fergus County land17.

Building a home in Fergus County: what are the steps?

  1. Ask the Fergus County Planning Office to confirm the parcel's jurisdiction, land-use constraints, floodplain status, addressing and access needs10.
  1. Obtain the county development permit before construction; it identifies property, road or floodplain limitations, assigns the physical address and provides an encroachment permit when needed2.
  1. Confirm with Fergus County Environmental Health that the site can support the proposed wastewater system and complete the septic application and site-visit process314.
  1. Determine whether the structure is exempt from the state building permit or requires state plans, plan review, trade permits and inspections811.
  1. Contact Road and Bridge for a county-road right-of-way encroachment application, or the Montana Department of Transportation for a new or modified approach onto a state highway1819.

What should you check before buying land in Fergus County?

Start with buildability, not the listing description: have Planning identify property, road and floodplain limitations and ask Environmental Health about wastewater feasibility23. Only about 4% of county soils are rated without severe limits for a conventional septic drain field, while about 58.6% of the land has a slope of 15% or less1520. Those countywide figures do not replace a parcel-level site evaluation3.

For access, ask Road and Bridge about county-road encroachment requirements, while any new or modified driveway approach to a state highway needs a state approach permit or right-of-way agreement1819. If mapped floodplain is involved, new development in a designated Special Flood Hazard Area requires local floodplain review, and the county's published floodplain review fee is $5002122. The median property-tax bill is about $1,709 per year, with an effective rate near 0.8%2324.

Watch-outs

  • No state building permit for a typical rural home does not remove the Fergus County development-permit requirement12.
  • Beginning construction before the county development permit raises the listed charge from $50 to $5004.
  • Countywide zoning, private-land RV occupancy, tiny-home occupancy and dimensional standards could not be confirmed; ask the Fergus County Planning Office about the specific parcel510.
  • A Certificate of Subdivision Approval does not replace the local drainfield permit6.

Sources

  1. Montana DLI Certified City, County and Town Programs (2026 county census)
  2. Fergus County Planning Office Fee Schedule, quoted and re-checked
  3. Health Department - Environmental Health, quoted and re-checked
  4. Fergus County Planning Office Fee Schedule, quoted and re-checked
  5. (2026 county census)
  6. Health Department - Environmental Health, quoted and re-checked
  7. Building Permits, quoted and re-checked
  8. Certified City, County and Town Programs, quoted and re-checked
  9. Inspection Areas & Contact Information, quoted and re-checked
  10. Fergus County Planning Office (fergusmt.gov)
  11. Building Permits (Montana statewide rule), quoted and re-checked
  12. Frequently Asked Questions (Montana statewide rule), quoted and re-checked
  13. 76-2-201. County zoning authorized, MCA (Montana statewide rule), quoted and re-checked
  14. Fergus County Health Department - Environmental Health (fergusmt.gov)
  15. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  16. Health Department - Environmental Health, quoted and re-checked
  17. Public Use Rules and Regulations (Montana statewide rule), quoted and re-checked
  18. Fergus County Road and Bridge Department (fergusmt.gov)
  19. Approach Manual for Landowners and Developers (Montana statewide rule), quoted and re-checked
  20. Share of land at 15% slope or less: Bolthole Index county data
  21. Stream Permitting (Montana statewide rule), quoted and re-checked
  22. Fergus County Planning Office Fee Schedule, quoted and re-checked
  23. Median property tax bill: Bolthole Index county data
  24. Effective property tax rate: Bolthole Index county data

Written September 27, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

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County locator

Fergus County in Montana

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

How Fergus County scores

Seclusion90100% ev.
Self-Sufficiency36100% ev.
Admin Boringness7468% ev.
Durability42100% ev.
Property Autonomy83100% ev.
Carry Cost8296% ev.

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

$309kTypical home
0.8%Property tax
$1,279Land / acre
17"Annual rain
12% of yrsSevere drought
5.5 / yr (+4.7)Mid-century 100°F days
19.1 daysMid-century dry spell
1.08" (+5.7%)Mid-century 1-day rain
1.27×Wildfire change factor
100%Forward climate coverage
$1,819Home insurance / yr
0.3% / yrInsurance growth
0.62%Nonrenewal rate
single ZIP shrunk to state medianInsurance basis
662Radius comparison (15 mi)
2.7People / sq mi
20.2%Federal land
58.6%Land at 15% slope or less
4%Septic soil without severe limits
105,170 acWorkable land screen
20.4%Wooded land
23.5 tonsBiomass / forest ac
44.2°FAvg temp

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Answers from the rulebook for Fergus County

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

Fergus County rules

  • Who permits septicCounty

    Septic and subsurface wastewater administration by Fergus County Environmental Health.

    • The county page identifies septic applications, site visits, as-builts, certified installer applications, certified site evaluator applications, and DEQ4 resources.
    • The county page lists the Sanitarian and county Environmental Health contact information.
    “Septic and waste water treatment: Septic Application/Site Visit Request As-Built Certified Installers Application (print version) Certified Installers Application (online fillable) Certified Site Evaluator Application (print version) Certified Site Evaluator Application (online fillable) DEQ4”
  • Septic permitRequired

    Drainfield and subsurface wastewater installations in Fergus County.

    • A drainfield permit remains required even when a Certificate of Subdivision Approval exists.
    • The permit is issued by the local health department.
    • The Fergus County Environmental Health page provides the county septic application and site-visit request.
    “Yes, even thought you have a COSA, a drainfield permit is still required by the local health department.”
  • Building in a floodplainLimited

    Development and construction in Fergus County floodplain areas.

    • The county development permit identifies floodplain limitations.
    • A floodplain review fee is listed at $500.
    • An additional $250 applies if construction begins before review.
    • A floodplain violation inspection is listed at $250 per visit.

    floodplain review fee: 500 USD (Additional $250 if construction begins prior to review) · floodplain violation inspection: per 250 USD (Each visit)

    “Floodplain Review $500* *Additional $250 if Construction begins prior to review Floodplain Violation Inspection, each visit $250”
  • Permit feesPublished

    Fergus County planning and development permit fees.

    • All fees are non-refundable.
    • The schedule is approved January 2026.
    • Development permit fee is $50; beginning construction before obtaining the development permit is listed as $500.
    • Floodplain review is $500, with an additional $250 if construction begins before review.
    • Subdivision fees vary by subdivision type and lot count, and examining land surveyor costs are billed at actual cost.

    development permit fee: 50 USD · development permit after construction begins: 500 USD · floodplain review: 500 USD (Additional $250 if construction begins prior to review)

    “ALL FEES ARE NON-REFUNDABLE Approved January 2026 ADMINISTRATIVE MATERIALS “K” Fergus County Planning Office Fee Schedule”
  • Permit processPublished (with conditions)

    Fergus County development-permit process before construction.

    • The development permit is obtained prior to any construction.
    • The permit identifies property, road, or floodplain limitations, assigns a physical address, and provides an encroachment permit if needed.
    • The fee schedule states the fee consequences if construction begins before obtaining the development permit.

    development permit fee: 50 USD ($500 if construction begins prior to obtaining the development permit)

    “This permit will be obtained prior to any construction in order to identify any property, road or floodplain limitations, to assign a physical address and receive an encroachment permit if needed”

Montana rules that apply here

  • Building permitLimited

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

    • A state building permit is required before construction for certain types of new buildings and for certain alterations, additions, and repairs.
    • The state permit requirement does not apply to projects within the jurisdictional limits of a certified local government program; local requirements may apply there.
    • In the state's jurisdiction, state law exempts farm and ranch buildings; mining buildings on mining property; petroleum refineries and pulp and paper mills except office and shop buildings; residential buildings containing less than five dwelling units except when serving transient guests; and private garages and private storage buildings used for the owner's own use and not as part of a commercial enterprise or business.
    • Building permits must be issued on required projects before plumbing, mechanical, or electrical permits can be issued and before work authorized under those permits can start.
    “In Montana a state building permit is required prior to the start of construction for certain types of new buildings, and/or for alterations, additions, and repairs.”
    One more reviewed finding on this topic
    • Limited — State-jurisdiction portions of Fergus County outside certified local-government building-code jurisdictions.
      “In Montana a state building permit is required prior to the start of construction for certain types of new buildings, and/or for alterations, additions, and repairs.”
  • Owner-builder exemptionConditional

    Owner-use private garages and private storage buildings in State Building Codes Bureau jurisdiction.

    • The exemption is limited to private garages and private storage buildings used for the owner's own use.
    • The building must not be part of a commercial enterprise or business.
    • Other building-permit exemptions listed by the state also apply, including farm and ranch buildings and residential buildings containing fewer than five dwelling units except when serving transient guests.
    “private garages and private storage buildings used for the owner's own use (not part of a commercial enterprise or business)”
  • 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.”
    One more reviewed finding on this topic
    • Adopted — State building codes applicable in Fergus County areas under State Building Codes Bureau jurisdiction.
      “All of the codes listed below are amended and adopted by: Administrative Rules of Montana (ARM) Title 24, Chapter 301”
  • 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
    • Required — Projects requiring state building-code inspections in Fergus County state-jurisdiction areas.
      “The Building & Commercial Measurements Bureau has highly qualified inspectors assigned geographically throughout the state that perform the inspections required by Montana law.”
  • 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.”
  • Subdividing landRegulated (with conditions)

    Subdivision review affecting Fergus County parcels.

    • DEQ review covers divisions of land comprising less than 20 acres.
    • Condominiums and recreational camping vehicle and mobile-home parks are reviewed regardless of parcel size.
    • Review is limited to sanitation facilities, including water supply, sewage disposal, solid waste disposal, and storm drainage.
    • Subdivisions are reviewed before parcels are created.

    parcel-size threshold: < 20 acres (Condominiums and recreational camping vehicle and mobile-home parks are reviewed regardless of parcel size)

    “The DEQ Subdivision Program reviews divisions of land comprising less than 20 acres, as well as condominiums and recreational camping vehicle and mobile home parks, regardless of the size of the parcel where they are located. This review is limited to sanitation facilities, including the water supply, sewage disposal, solid waste disposal, and storm drainage systems.”
  • 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;”
  • county zoning authorityGeneral

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

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

Still unanswered

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

  • County-wide zoning — Countywide zoning in Fergus County.
  • Local zoning — Local zoning across Fergus County, including incorporated areas and the county's 4.5-mile City-County Planning Board jurisdiction.
  • Zoning districts — Published zoning districts in Fergus County.
  • Minimum dwelling size — Minimum dwelling size in Fergus County.
  • Minimum lot size — Minimum lot size in Fergus County.
13 more unanswered
  • Setbacks
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • 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 Fergus County, Montana

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

Fergus County scores 69/100 on the Bolthole Index, a strong county profile. Its strengths: deep seclusion — about 662 people within 15 miles and a stronger property-autonomy legal backdrop. Watch-outs: thin water margin (17″/yr rainfall) and elevated current hazard exposure.

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

Fergus County does not require a county building permit for a home in unincorporated areas. Onsite septic is permitted by Fergus County Health Department (Environmental Health). 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.

How much does land cost in Fergus County, Montana?

Land in Fergus County runs about $1,279 per acre, based on the latest county data.

What is the water situation in Fergus County?

Fergus County gets about 17" of rain a year, with severe drought in roughly 12% of years.

How remote is Fergus County?

A typical private-land location has about 662 people within 15 miles and 157,819 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

Off-grid gear

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

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How Fergus compares in Montana

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