Bolthole Index

Madison County, Montana

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

69Index Score / 100
#17 of 56 in Montana

Madison County, Montana requires a county construction/demolition permit for qualifying projects even though most private homes are exempt from the state's building-permit program12. The Madison County Sanitarian handles the county permit and local wastewater permits13. Countywide zoning could not be confirmed, so ask the Planning Office whether parcel-specific or citizen-initiated zoning affects the land45.

At a glance

County construction permit
Required for qualifying construction or demolition projects through the Madison County Sanitarian1
State building permit
Most private homes are exempt unless used for transient guests2
Zoning
Countywide zoning could not be confirmed; subdivision rules apply and localized zoning may affect a parcel46
Septic permit
Required for new, repaired, replaced or altered wastewater systems, subject to limited exceptions7
RV living
A countywide rule could not be confirmed; ask the Planning Office and Sanitarian before occupying an RV45
Tiny homes
No specific countywide occupancy rule was confirmed; parcel zoning and wastewater approval still need review47
Owner-builder
No explicit exemption was confirmed; ask the Sanitarian before relying on owner-builder status89
Minimum home or lot size
No single countywide minimum was confirmed; ask Planning and the Sanitarian about the specific parcel459

Who to call

Septic permits

Madison County Sanitarian

Madison County construction/demolition permits and wastewater-system permits

(406) 898-4338

[email protected]

7 Placer Loop, Virginia City, MT 59755

Planning & zoning

Madison County Planning Office

Subdivision review, planning, land-use questions and floodplain information

(406) 898-4331

[email protected]

7 Placer Loop, Virginia City, MT 59755

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 Madison County, Montana?

For a typical rural home, there are two separate answers. Madison County requires owners to determine whether a construction/demolition permit from the Sanitarian is needed before beginning work1. Montana's state building-permit program generally exempts most private homes unless they serve transient guests; farm and ranch buildings and private garages or storage buildings used by the owner and not as part of a business are also among the state exemptions2.

The state exemption does not erase Madison County's local construction/demolition permit1. Projects that are not exempt from the state program need the state building permit before related plumbing, mechanical or electrical permits can issue or work under those permits begins2. A project subject to state permitting also receives state inspections, and the permit holder must notify the inspector when work is ready10.

Who handles Madison County building permits, and how do you reach them?

Madison County does not present a conventional building-inspection department for an ordinary exempt rural home; the local construction/demolition permit goes through the Madison County Sanitarian1. The Sanitarian is at 7 Placer Loop, Virginia City, MT 59755, can be reached at (406) 898-4338, and lists [email protected] as its office contact9.

For subdivision status, possible localized zoning, land-use review and floodplain questions, contact the Madison County Planning Office at 7 Placer Loop, Virginia City, MT 59755, (406) 898-4331, or [email protected]5. If the proposed building is not within a state exemption, Montana's Building Codes Program requires construction plans and a Building Permit/Plan Review Application before it will review and issue the state permit11.

Does Madison County, Montana have zoning?

A comprehensive countywide zoning system for unincorporated Madison County could not be confirmed4. Madison County does regulate subdivisions under its subdivision regulations, while localized citizen-initiated zoning may exist in particular areas46. That distinction matters: a countywide answer does not establish what is allowed on a specific parcel.

Ask the Planning Office to check the parcel for any applicable local zoning, subdivision plat conditions, covenants, airport-area rules or other recorded development limits before choosing a house site5. Land created under the agricultural-use division exemption must remain exclusively agricultural; using it for something else triggers subdivision review, and residential, commercial or industrial structures cannot be erected there unless the covenant is revoked through that review6. No single countywide rule for minimum dwelling size, minimum lot size, setbacks, lot coverage or building height could be confirmed, so obtain a parcel-specific answer from Planning45.

How do septic permits work in Madison County?

Madison County requires a valid permit before constructing a new wastewater treatment system or repairing, replacing or altering an existing one, although the department may treat a repair as minor enough not to require a permit and approved public sewage systems are an exception7. Applications go through the Madison County Sanitarian and require owner and applicant information, a county-licensed installer, the legal description, structure and bedroom information, a site plan, applicable environmental documentation and a nonrefundable fee79.

Published fees are $300 for a standard conventional system, $400 for an advanced alternative system, $600 for an experimental system and $200 for a replacement system12. Only 16.3% of county soils are rated without severe limitations for a conventional septic drain field, so make wastewater feasibility an early contingency rather than a late design detail13. The department's stated response period is 10 working days for a complete standard application and 30 calendar days for specified multi-user, public subsurface or engineering-review systems14.

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

Madison County's countywide rules for long-term RV occupancy, temporary camping on private land and tiny-home occupancy could not be confirmed4. Do not treat the absence of a confirmed countywide rule as permission: ask the Planning Office whether localized zoning, subdivision conditions or other parcel-specific restrictions apply45.

The wastewater question is clearer than the occupancy question. A tiny home or occupied RV that relies on a new, repaired, replaced or altered wastewater treatment system falls within Madison County's local permit framework, subject to the regulation's stated exceptions7. The county materials also do not establish a complete rule for every off-grid sanitation alternative, so discuss the proposed toilet, wastewater and water setup with the Sanitarian before buying equipment or moving onto the parcel39. A Montana rule limiting stays at state public-use sites does not answer whether residential RV use is allowed on private land15.

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

  1. Ask the Planning Office to confirm the parcel's subdivision status, any localized zoning and whether floodplain review is implicated465.
  1. Contact the Sanitarian to determine whether the planned work needs Madison County's construction/demolition permit19.
  1. Establish wastewater feasibility and submit the septic application, site plan and supporting environmental documentation before construction7.
  1. Determine whether the structure is exempt from the state building permit; most private homes are exempt unless they serve transient guests2.
  1. For a non-exempt structure, submit plans and the state application, pay the required fees and arrange required inspections1110.
  1. If access will be new or modified on a state highway, obtain the required Montana approach permit or right-of-way agreement through the appropriate district office16.

What should you check before buying land in Madison County?

Start with legal buildability: confirm subdivision history, agricultural-use covenants, localized zoning and floodplain status with the Planning Office645. New development in a designated Special Flood Hazard Area requires local floodplain review, with permit details set locally17. Confirm road access separately, because a new or modified approach onto a Montana state highway requires state authorization, while a complete county-road driveway rule could not be confirmed16.

Then test physical feasibility. Only 16.3% of soils are rated without severe limits for a conventional septic drain field, just 41.2% of county land is at a slope of 15% or less, and severe drought has occurred in 16.2% of years131819. Private-well permitting and countywide utility-connection requirements could not be confirmed, so verify water rights, well feasibility and any service obligation for the parcel before closing95. The effective property-tax rate is about 0.4%, with a median annual bill of about $1,8002021.

Watch-outs

  • A state building-permit exemption does not eliminate Madison County's separate construction/demolition permit; ask the Sanitarian before work begins19.
  • Countywide answers do not resolve possible citizen-initiated zoning or recorded subdivision restrictions on a particular parcel; obtain a parcel review from the Planning Office465.
  • Owner-builder, long-term RV, tiny-home, private-well and county-road driveway rules remain unconfirmed; ask the Sanitarian and Planning Office for written parcel-specific answers895.

Sources

  1. Madison County - Construction & Demolition (2026 county census)
  2. Building Permits (Montana statewide rule), quoted and re-checked
  3. Madison County Wastewater System Regulations (2026 county census)
  4. Madison County - Planning Office Publications/Regulations (2026 county census)
  5. Madison County Planning Office (madisoncountymt.gov)
  6. Planning Regulations and Plans, quoted and re-checked
  7. Septic System Information, quoted and re-checked
  8. (2026 county census)
  9. Madison County Sanitarian (madisoncountymt.gov)
  10. Building Permits, quoted and re-checked
  11. Building Permits (Montana statewide rule), quoted and re-checked
  12. Madison County Construction & Demolition Application/Permit, quoted and re-checked
  13. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  14. Construction & Demolition, quoted and re-checked
  15. Public Use Rules and Regulations (Montana statewide rule), quoted and re-checked
  16. Approach Manual for Landowners and Developers (Montana statewide rule), quoted and re-checked
  17. Stream Permitting (Montana statewide rule), quoted and re-checked
  18. Share of land at 15% slope or less: Bolthole Index county data
  19. Share of years in severe drought: Bolthole Index county data
  20. Effective property tax rate: Bolthole Index county data
  21. Median property tax bill: Bolthole Index county data

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

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County locator

Madison County in Montana

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

How Madison County scores

Seclusion86100% ev.
Self-Sufficiency43100% ev.
Admin Boringness7090% ev.
Durability38100% ev.
Property Autonomy83100% ev.
Carry Cost70100% 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 →

$756kTypical home
0.4%Property tax
$2,757Land / acre
23"Annual rain
16.2% of yrsSevere drought
0.3 / yr (+0.2)Mid-century 100°F days
18.1 daysMid-century dry spell
1.04" (+5.7%)Mid-century 1-day rain
1.23×Wildfire change factor
100%Forward climate coverage
$2,234Home insurance / yr
3.4% / yrInsurance growth
1.03%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
2,767Radius comparison (15 mi)
2.7People / sq mi
48%Federal land
41.2%Land at 15% slope or less
16.3%Septic soil without severe limits
361,826 acWorkable land screen
41.9%Wooded land
29.1 tonsBiomass / forest ac
39.9°FAvg temp

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Answers from the rulebook for Madison County

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

Madison County rules

  • Who permits septicCounty (with conditions)

    Individual and multi-user wastewater treatment systems in Madison County.

    • The county regulations are adopted under local-board authority and require compliance with state standards.
    • The Madison County Sanitarian's Department may require proof of compliance with other agencies', districts', or governmental entities' rules when pertinent.
    “It is with these criteria in mind that the Madison County Board of County Commissioners has adopted the following regulations.”
  • Septic permitRequired

    New, repaired, replaced, or altered wastewater treatment systems in Madison County.

    • Pre-October 15, 1991 systems must meet the regulation's Section 1.2 requirements.
    • A public sewage disposal system approved by Montana DEQ is an exception to the permitted-system requirement.
    • The application requires owner and applicant information, a Madison County licensed installer, legal description, structure and bedroom information, site plan, current DEQ approval or non-degradation analysis, and a nonrefundable fee.
    • The Department may determine a repair is minor enough not to require a permit.
    “It shall be unlawful for any person to construct a new wastewater treatment system or to repair, replace or alter an existing system within Madison County unless that person holds a valid permit issued by the Department for specific construction, repair, replacement and alteration proposed.”
  • Subdividing landRegulated (with conditions)

    Subdivision and divisions of land subject to Madison County Subdivision Regulations – Ordinance 1-2025.

    • Some divisions are exempt from local subdivision review under Montana law and the county regulations.
    • Agricultural-use divisions must be used exclusively for agricultural purposes; a non-agricultural use subjects the parcel to subdivision review.
    • Residential, commercial, or industrial structures may not be used, constructed, or erected on parcels created under the agricultural exemption unless the covenant is revoked through subdivision review.
    “If the divided land is used for anything other than agricultural purposes, the land must go through subdivision review.”
  • Permit feesPublished (with conditions)

    Madison County construction/demolition permits and wastewater permits.

    • Construction/demolition fees vary by square footage.
    • The wastewater regulations publish separate septic permit fees in Appendix A.
    • The construction/demolition application states Ordinance 2-2006 was effective and enforceable July 20, 2006.

    standard conventional wastewater system fee: 300 USD · advanced alternative wastewater system fee: 400 USD · experimental wastewater system fee: 600 USD · replacement wastewater system fee: 200 USD

    “Standard Conventional System $ 300.00 - Advanced Alternative System $ 400.00 - Experimental System $ 600.00 - Replacement System $ 200.00 -”
  • Permit processPublished (with conditions)

    Madison County construction/demolition and wastewater permit processes.

    • Construction/demolition applicants submit the county application to the Sanitarian's Office with payment determined from the fee schedule.
    • Wastewater applications require the county form, applicable DEQ or non-degradation documentation, site plans, and a nonrefundable fee.
    • The wastewater Department responds within 10 working days for complete applications and within 30 calendar days for specified multi-user, public subsurface, or engineering-review systems.

    standard wastewater application response time: 10 working days (30 calendar days for multi-user, public subsurface, or engineering-review systems)

    “The Department shall respond within ten (10) working days from the date the completed application was filed. The Department shall respond within thirty (30) calendar days for multi-user wastewater treatment systems, public subsurface wastewater treatment systems, or those systems requiring engineering review.”
  • County-wide zoningAbsent

    Madison County regulates land through subdivision regulations and a 2025 Growth Policy rather than comprehensive county-wide zoning; unincorporated areas default to county subdivision regulations (localized citizen-initiated zoning may exist in specific areas).

    Madison County - Planning Office Publications/Regulations ↗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.”
  • Building code adoptedAdopted (with conditions)

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

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

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

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

    State building-code inspections for projects requiring a state building permit.

    • The state page states that exemptions apply, including residential buildings containing less than five dwelling units except when serving transient guests.
    • The permit holder must notify the inspector when work is ready and provide access for required inspections.
    • Local certified-government inspection programs may apply within their jurisdictional limits.
    “It is the responsibility of the permit hold to notify the inspector when work is ready for inspection and to provide access for required inspections.”
    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.”
  • 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”
  • Campground & park staysLimited

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

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

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

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

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

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

Still unanswered

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

  • Owner-builder exemption — Owner-builder exemptions from Madison County construction or building requirements.
  • Local zoning — Aggregate local zoning across Madison County municipalities, townships, and citizen-initiated districts.
  • Zoning districts — Published zoning districts in Madison County.
  • Minimum dwelling size — Minimum dwelling size in unincorporated Madison County.
  • Minimum lot size — Minimum lot size in unincorporated Madison County.
11 more unanswered
  • Setbacks
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Off-grid sanitation
  • Well permit
  • 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 Madison County

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

Over-appropriated / declining

The aquifer here is over-appropriated and declining. A domestic well is usually still permit-exempt, but long-term supply is a genuine risk.

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) ↗
  • Yellowstone Compact Controlled Groundwater Areapartial of county

    NPS-Montana Compact CGWA covering drainages north/west of Yellowstone to protect the park's geothermal/water resources; new groundwater appropriations of any size require a DNRC permit (the 35-gpm exempt-well basis is suspended).

    Montana DNRC — Basin Closures and Controlled Ground Water Areas ↗

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 Madison County, Montana

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

Madison County scores 69/100 on the Bolthole Index, a strong county profile. Its strengths: deep seclusion — about 2,767 people within 15 miles and a stronger property-autonomy legal backdrop. Watch-outs: elevated current hazard exposure.

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

Madison County requires a building permit only in limited cases (such as floodplains or specific zones), and it has no county-wide zoning. Onsite septic is permitted by Madison County Sanitarian / Environmental Health. 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 Madison County, Montana?

Land in Madison County runs about $2,757 per acre, based on the latest county data.

What is the water situation in Madison County?

Madison County gets about 23" of rain a year, with severe drought in roughly 16.2% of years. On water rights, Madison County lies in the Yellowstone Compact Controlled Groundwater Area — NPS-Montana Compact CGWA covering drainages north/west of Yellowstone to protect the park's geothermal/water resources; new groundwater appropriations of any size require a DNRC permit (the 35-gpm exempt-well basis is suspended)..

How remote is Madison County?

A typical private-land location has about 2,767 people within 15 miles and 355,789 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

Off-grid gear

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

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How Madison compares in Montana

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