County seat: Red Lodge
Building in Carbon County
How zoning works here
This county administers zoning across the unincorporated county.
Carbon County has NO formal countywide zoning regulations outside of incorporated cities and towns; the county relies on its Comprehensive Development Regulations (development permits) for land-use control in unincorporated areas.
Building permits
Building permit authority is not verified for this county
Carbon County does NOT have a certified county building department for building code enforcement. Carbon County issues 'Development Permits' (Group 1 Residential and Group 2 Commercial) under its Comprehensive Development Regulations — these are land-use/zoning compliance permits, not building code permits. The county's own Development Process Guide states: 'There are no formal zoning regulations in Carbon County (excepting in cities and towns).' Non-exempt building code permits for unincorporated Carbon County are issued by the Montana State Building Codes Bureau (DLI). Within Red Lodge city limits, the city handles its own permits.
Who to call
Building permits
Carbon County Planning & Development (issues Development Permits, which are land-use permits, not building code permits)
Floodplain administrator
Carbon County Planning & Development (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: Red Lodge, Bridger, Laurel (partially), Columbus.
Check a specific parcel in Carbon 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: carbonmt.gov, carbonmt.gov, carbonmt.gov, carbonmt.gov