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§ 02
When a permit is required
Permit triggers and exempt work for Twin Falls County
All persons, firms, or corporations desiring to construct, erect, move, or repair a building in unincorporated Twin Falls County must first apply for a permit.
Required documents
- Completed permit application
- Plat showing size and location of existing and proposed buildings
- Building code
- 2018 International Building Code (IBC), International Residential Code (IRC), International Energy Conservation Code (IECC), International Mechanical Code (IMC), International Fuel Gas Code (IFGC), International Existing Building Code (IEBC), 2018 Fire Code (IFC) with Idaho Amendments, and 2018 Idaho Manufactured Home Installation Standards
- Contractor requirements
- Contractors must register with the Idaho Contractors Board if project value exceeds $2,000.
§ 03
Application process
Application → plan check → issuance → inspection → final
- 01 Prepare application with plat showing size and location of existing and proposed buildings.
- 02 Submit application and plat to Twin Falls County Building Department in person.
- 03 Building Department reviews application for completeness.
- 04 Upon approval, applicant receives permit.
§ 04
Frequently asked
Common questions about unincorporated Twin Falls County permits
01 Do I need a building permit in unincorporated Twin Falls County, ID? ▸
All persons, firms, or corporations desiring to construct, erect, move, or repair a building in unincorporated Twin Falls County must first apply for a permit.
02 How do I apply for a building permit in unincorporated Twin Falls County, ID? ▸
To apply for a building permit in unincorporated Twin Falls County, ID, follow these steps: 1. Prepare application with plat showing size and location of existing and proposed buildings. 2. Submit application and plat to Twin Falls County Building Department in person. 3. Building Department reviews application for completeness. 4. Upon approval, applicant receives permit.
last verified April 2026
source Twin Falls County Building Department ↗
entry id permits/idaho/twin-falls/unincorporated
Educational reference. Permit rules and fees change — confirm current requirements directly with Twin Falls County Building Department before applying. Jaspector is not legal advice.