County seat: Hamilton
Building in Ravalli County
How zoning works here
This county administers zoning across the unincorporated county.
Ravalli County has no countywide zoning; only citizen-initiated zoning districts (CIZDs) exist in specific areas where at least 60% of freeholders petitioned — most of the unincorporated county is unzoned.
Building permits
Building permit authority is not verified for this county
Ravalli County does NOT have a certified county building department for unincorporated areas. Building permits for non-exempt structures in unincorporated Ravalli County are issued by the Montana State Building Codes Bureau (DLI). State law exempts single-family residential structures with fewer than 5 dwelling units, farm and ranch buildings, and private garages used for the owner's own use. Within the City of Hamilton and other incorporated municipalities, local city building departments apply.
Who to call
Building permits
Montana Department of Labor & Industry Building Codes Program (state authority for unincorporated Ravalli County)
Floodplain administrator
Ravalli County Planning Department (Floodplain Administration)
State building codes
Montana Department of Labor and Industry, Building Codes Bureau
Cities with their own jurisdiction
Inside these limits the municipality, not the county, is generally the planning and permitting authority: Hamilton, Stevensville, Victor, Corvallis, Darby.
Check a specific parcel in Ravalli County
County rules are only part of the picture. Terrain, soils, septic feasibility, flood, wetlands and access are parcel-specific.
County authority details researched from primary county sources and verified 2026-08-14. County rules change and this page is a starting point, not a determination. Confirm anything you intend to rely on directly with the office that administers it. Sources: ravallicounty.gov, ravallicounty.gov, ravallicounty.gov, ravallicounty.gov