Twin Falls County Building Department (Community Development Services)

Building and Occupancy Permit (unincorporated Twin Falls County)

The county's Commercial Building Permit Information brochure (Revised 07-2026) states that "A building permit is required any time a building or structure is erected, constructed, remodeled", sets out when an occupancy permit is needed, including a change in the type of use of a building, and states: "All permits expire after 180 days from the date of permit issuance or the date of last inspection." It also states: "The minimum penalty for work started without a permit is an amount equal to the building permit fee." The county's Commercial Building Permit Application (Updated 7/2026) states: "Plan Review Fee of 65% of permit fee or $200 (whichever is greater) due when submitting completed application. Building Permit Fee will be collected when the permit is Issued." The same form asks for a septic permit or comment letter from South Central Public Health District and a site plan stamped by the district. The Board of County Commissioners' August 2025 minutes record the adoption on 14 August 2025 of Resolution No. 2025-035, which adopted a Building Valuation Table (Exhibit A), Zoning Permit Fees (Exhibit B) and Misc. Building Permit Fees (Exhibit C); the minutes do not reproduce those exhibits. The Building Department issues these permits for the unincorporated county, as listed on the Community Development Services page. Twin Falls County offices are at 630 Addison Ave W, Twin Falls, ID 83301; the county's main line is 208-736-4000.