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

At a glance

Building permit

Not required for most small residential buildings in unincorporated Park County¹

Zoning

Varies by district; parcel-specific review is essential²

Septic permits

Park County Environmental Health⁷

RV living

Countywide private-land rule not confirmed; ask Planning⁸

Tiny homes

Countywide occupancy rule not confirmed; ask Planning⁸

Owner-builder

No applicable exemption confirmed⁹

Conventional septic soils

Only 6.1% of soils rate without severe limitations¹⁰

Property tax

0.6% effective rate; $2,454 median annual bill¹¹¹²

Who to call

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 Park County, Montana?

Usually not for a conventional small home in unincorporated Park County. Montana exempts residential buildings containing fewer than five dwelling units from the state building permit when they are not serving transient guests, and unincorporated Park County is not listed as a certified local building-code jurisdiction¹. Farm and ranch buildings, qualifying private garages and qualifying private storage buildings also fall within state exemptions¹³.

The exemption is narrower than it first sounds. Covered commercial, multifamily, transient-lodging, alteration, addition or repair work can still require a state permit, and separate electrical, plumbing or mechanical permits may be required¹⁴¹⁵. Park County land-use, zoning, septic, subdivision and floodplain requirements also remain separate from the building-permit question⁵³.

Who handles building and land-use permits in Park County?

Park County does not present a county building department for ordinary exempt small-home construction; the Park County Planning Department is the practical first call for land-use questions¹⁵. The office is at 414 East Callender Street in Livingston and can be reached at (406) 222-4102⁵. Planning administers subdivisions, zoning, floodplains, rural improvement districts and buildings for lease or rent⁵.

For a project that is subject to the state building code, Montana's Building Codes Program handles permitting and inspections outside certified local jurisdictions¹⁶. State applicants submit construction plans and a Building Permit/Plan Review Application; approval follows satisfactory responses to plan-review comments and payment of the applicable fees¹⁵. The state plan-review fee is 35 percent of the building permit fee¹⁷.

Does Park County, Montana have zoning?

Park County zoning is district-specific, not a simple countywide yes-or-no answer. The county identifies six citizen-initiated zoning districts and one county-initiated district, with requirements that vary by district¹⁸. Montana law authorizes a county with an adopted growth policy to zone all or part of its jurisdiction¹⁹.

A buyer should therefore have the Planning Department identify the parcel's district and applicable regulations before relying on a seller's description of the land⁵. The countywide status of rules for setbacks, minimum lot size, building height, lot coverage and minimum dwelling size could not be confirmed; those questions belong in the parcel review with Planning²⁵. If a land division is contemplated, every Park County subdivision proposal requires County Commission review and approval before implementation²⁰.

How do septic permits work in Park County?

Park County Environmental Health administers onsite wastewater locally and publishes county septic regulations, fees, a permit application and online septic-permit access³⁶. A Certificate of Subdivision Approval does not replace the drainfield permit; the local health department still requires the drainfield permit²¹. Montana DEQ separately handles sanitation review for covered subdivisions²².

Only 6.1% of Park County soils rate without severe limitations for a conventional septic drain field, so septic feasibility deserves early attention before choosing a house site or purchase price¹⁰. Ask Environmental Health what site evaluation, design and inspection steps apply to the specific parcel because the inspection stages could not be confirmed from the available county material⁶. The office's listed county switchboard is (406) 222-4100 at 414 E. Callender Street in Livingston⁶.

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

We could not confirm a countywide rule for living in an RV, occupying a tiny home, temporarily camping on private land or placing a manufactured home in Park County. Because Park County's zoning requirements vary among its districts, ask the Planning Department to check the parcel and proposed use rather than assuming that rural land is unrestricted²⁵.

Montana's public-use-site camping limits apply to Fish, Wildlife & Parks sites, not private-land occupancy, so those limits do not answer whether someone may live in an RV on a Park County parcel²³. A proposal that creates two or more RV or mobile-home spaces can also enter subdivision review, and every subdivision proposal requires Park County Commission approval before implementation²⁰. The owner-builder exemption is likewise unconfirmed, so ask the relevant state licensing and permit offices before hiring trades or acting as your own contractor⁹.

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

1. Ask the Park County Planning Department to identify any zoning district, subdivision restriction and floodplain issue affecting the parcel²⁵.
2. Have Park County Environmental Health determine the septic-permit path and site requirements before fixing the building location³⁶.
3. If a well will exceed 35 gallons per minute and 10 acre-feet per year, obtain the required water-use permit before appropriation; smaller developments follow the applicable filing path²⁴.
4. Confirm whether the project fits Montana's exemption for a residential building with fewer than five dwelling units that does not serve transient guests¹.
5. For covered work, submit plans and the state Building Permit/Plan Review Application, then obtain any separate trade permits¹⁵.
6. If a driveway meets a Montana state highway, obtain an approach permit or right-of-way agreement from the appropriate MDT district office²⁵.

What should you check before buying land in Park County?

Start with septic feasibility: only 6.1% of county soils rate without severe limitations for a conventional drain field¹⁰. Next, have Planning identify zoning and floodplain constraints because district rules vary and designated floodplain development requires a permit²⁴. Work in or near streams can require other permits before the county floodplain application²⁶.

Access also matters: a new or modified approach to a state highway requires an MDT approach permit or right-of-way agreement, while a countywide local-road driveway rule could not be confirmed²⁵. Park County is sparsely settled at about 6.4 people per square mile, and 54.4% of its land is wooded while 54% is federally owned²⁷²⁸²⁹. The effective property-tax rate is about 0.6%, with a median annual bill near $2,454¹¹¹².

Watch-outs

• A house can be exempt from the building permit while still needing zoning review, a septic permit or a floodplain permit¹²²¹⁴.
• Park County's RV, tiny-home, manufactured-home and private-land camping rules could not be confirmed countywide; ask Planning about the specific parcel and use⁵.
• Only 6.1% of Park County soils rate without severe limitations for a conventional septic drain field, so verify septic feasibility before committing to a house site¹⁰.

Sources

1. Montana DLI Building Codes Bureau - Certified Government Programs (2026 county census)
2. Park County Zoning, quoted and re-checked
3. Park County Environmental Health, quoted and re-checked
4. Park County Floodplain, quoted and re-checked
5. Park County Planning Department (parkcountymt.gov)
6. Park County Environmental Health (parkcountymt.gov)
7. Park County Environmental Health (2026 county census)
8. Park County Planning Department - Zoning (2026 county census)
9. (2026 county census)
10. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
11. Effective property tax rate: Bolthole Index county data
12. Median property tax bill: Bolthole Index county data
13. Building Permits (Montana statewide rule), quoted and re-checked
14. Montana Building Permits, quoted and re-checked
15. Building Permits (Montana statewide rule), quoted and re-checked
16. Building Permits (Montana statewide rule), quoted and re-checked
17. Frequently Asked Questions (Montana statewide rule), quoted and re-checked
18. Park County Zoning, quoted and re-checked
19. 76-2-201. County zoning authorized, MCA (Montana statewide rule), quoted and re-checked
20. Park County Subdivision, quoted and re-checked
21. Montana DEQ Engineering Infrastructure and Subdivisions, quoted and re-checked
22. Engineering Infrastructure & Subdivisions (Montana statewide rule), quoted and re-checked
23. Public Use Rules and Regulations (Montana statewide rule), quoted and re-checked
24. Montana DEQ Subdivision Application, quoted and re-checked
25. Approach Manual for Landowners and Developers (Montana statewide rule), quoted and re-checked
26. Park County Planning Department — Floodplain Program (parkcountymt.gov)
27. Population density: Bolthole Index county data
28. Wooded share of land: Bolthole Index county data
29. Federal land share: 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.