Unincorporated Jefferson County

Building permits are required for most new construction and major alterations in unincorporated Jefferson County.

Note: Many rural Idaho counties have no building permit requirement for certain structures; however, Jefferson County requires permits for most new construction and major alterations. Verify with the Planning Department for specific exemptions.

Building code

2018 International Building Code (IBC) and 2018 International Residential Code (IRC) as adopted by Idaho, with local amendments per Jefferson County Code Chapter 112.

Contractor requirements

Idaho Contractors Registration Act requires registration for jobs exceeding $2,000 (materials + labor combined).

1. 01
   Contact the Planning, Zoning & Building Department to determine permit requirements and applicable zoning district.
2. 02
   Prepare complete building plans, site plan, and zoning compliance documentation.
3. 03
   Submit application with all required documents to the Planning Department.
4. 04
   Department reviews application for completeness and zoning compliance.
5. 05
   Plan review period: approximately 15 business days minimum.
6. 06
   Respond to any comments or requests for additional information.
7. 07
   Receive permit upon approval and pay applicable fees.

Typical processing time: 15 business days minimum for plan review, may vary based on project complexity.

Source: Jefferson County Planning, Zoning & Building Department ↗