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

Liberty County requires its construction notification for plans to build, add to or alter a building; the county form also covers relocations and requires every permit that applies through the Montana Building Codes Program¹. Montana's state jurisdiction exempts farm and ranch buildings, private owner-use garages and storage buildings, and residential buildings with fewer than five dwelling units unless they serve transient guests; electrical, plumbing or mechanical permits may still be required². The state program adopts the statewide code, issues permits and inspects projects that require them where no certified local program governs¹⁰. An owner working on the owner's property is exempt from Montana's contractor-registration chapter, but that exemption does not waive applicable building or trade permits⁸.

Liberty County routes its construction notification to the County Commissioners rather than identifying a conventional county building department¹. The Liberty County Commissioners administer subdivision review and approval, while Montana DEQ reviews sanitation facilities for divisions creating parcels smaller than 20 acres and certain condominiums and recreational camping vehicle or mobile-home parks regardless of parcel size^6,11. Reach the Commissioners at 406.759.5365 or com@libertycountymt.gov at 111 1st East, Chester, MT 59522¹¹. For work requiring a state permit, the Montana Building Codes Program issues the permit and provides field inspections¹⁰. A state-administered project requires plans and a Building Permit/Plan Review Application, and separate electrical, plumbing or mechanical permits may apply².

Liberty County has no countywide zoning ordinance³. The state hazard-mitigation assessment for Liberty County names the airport in Chester as the only place with zoning³. We found no published county standard for minimum dwelling size, minimum lot size, setbacks, lot coverage or building height, so confirm those with the Commissioners before you design¹¹. Montana law lets county commissioners adopt zoning after adopting a growth policy, so the Commissioners could change this¹². The county website does post zoning maps, but the page does not give district names or standards, so we could not match those maps to any rule⁴. Before you buy, ask the Liberty County Commissioners whether any mapped district covers your parcel, and check with the town if the land is inside Chester or another incorporated area¹¹. Zoning is only one layer: building notification, septic permits and driveway approvals still apply outside any zoning district^1,6.

The Liberty County Sanitarian handles onsite wastewater permits under Montana DEQ Circular 4¹. A permit covers a new house or structure using onsite wastewater and replacement components such as a tank or leachfield⁶. Liberty County publishes a $150 fee for a new septic permit and a $75 fee for a replacement permit⁵. The application asks for property, water-supply, setback, soil, nitrate and site-plan information¹. Before permit issuance, the owner must provide a six-foot test pit for the soil evaluation unless a professional engineer performs the evaluation and supplies a report at the owner's expense⁵. A nitrate sample is required when a well is within one mile of the proposed drainfield, and the county says the soil evaluation may take up to a month⁶. Contact the Sanitarian at 719-433-6137 or sarahrobbin1@gmail.com before fixing the house site¹. Only about 9.1% of Liberty County soils are rated without severe limits for a conventional drain field¹³.

Liberty County has no countywide zoning ordinance³. We found no county rule on RV occupancy, tiny-home occupancy, accessory dwellings, manufactured-home occupancy or temporary camping on unincorporated private land, so none is confirmed either way¹¹. Whatever the answer on occupancy, any new house or structure using onsite wastewater still needs the county septic application and permit⁶. A building that is built, added to or altered, including a relocated one, still triggers the county construction notification¹. The statewide camping rule covers public-use sites rather than private property, so it does not answer the private-land question¹⁴. Rules inside Chester or another incorporated area were not confirmed, and the county website posts zoning maps we could not match to a rule, so ask the Commissioners before buying a small dwelling or planning long-term occupancy^4,11.

1. Ask the Liberty County Commissioners whether any published zoning map covers the parcel, and whether local setback or floodplain review applies; the county has no countywide zoning ordinance^3,4,11.
2. Return Liberty County's construction notification to the Commissioners for plans to build, add to, alter or relocate a building¹.
3. Determine whether the project is state-exempt or requires state building and trade permits; a farm or ranch building is exempt from the state building permit but not from the county notification or other land-use requirements².
4. Contact the County Sanitarian, submit the septic application and arrange the pre-permit soil evaluation^1,5.
5. Obtain advance approval for a county-road approach from the Road Supervisor and Commissioners, or an MDT permit or right-of-way agreement for a state-highway approach^9,15.
6. If the site is in a designated Special Flood Hazard Area, obtain the local floodplain administrator's development permit¹⁶.

Start with septic feasibility because only about 9.1% of Liberty County soils are rated without severe limits for a conventional drain field¹³. Water planning also matters in a dry climate: annual precipitation averages about 12.2 inches, and severe drought has occurred in about 13.8% of years¹³. Most land is comparatively gentle, with about 87.6% at a slope of 15% or less, but a gentle parcel can still have unsuitable drainfield soils¹³. Confirm legal access and determine whether the entrance meets a county road or a state highway because the approval path differs^9,15. Check flood status before placing a home, driveway, fill or utilities because development in a designated Special Flood Hazard Area requires local approval¹⁶. Property taxes average an effective rate of about 1%, with a median annual bill near $1,204¹³.