County Building Permits
Twin Falls County, ID - 2026 Building Permit Guide
How to apply for a building permit in unincorporated Twin Falls County, Idaho. Permit authority, application steps, fees, and inspection requirements.
Permit Authority
All unincorporated areas within Twin Falls County.
- Department
- Twin Falls County Building Department
- Address
- 630 Addison Ave, Twin Falls, Idaho 83301
Online Permit Portal
Platform: • Account required: No • Submission: In-person only
Additional resources:
Application Process
- Prepare application with plat showing size and location of existing and proposed buildings.
- Submit application and plat to Twin Falls County Building Department in person.
- Building Department reviews application for completeness.
- Upon approval, applicant receives permit.
General Requirements
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.
Work That Does NOT Require a Permit
Contact the Twin Falls County Building Department to confirm whether your project requires a permit before starting work.
Inspections
How to Schedule
Additional Resources
- 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
- Verify contractor license: Idaho Contractors Board
- Zoning information: View zoning info
- Idaho Division of Occupational and Professional Licenses (DOPL) – Building & Trades
- Idaho DEQ – Stormwater Permits (IPDES)
- South Central Public Health District (PHD 5) – Septic Permits
- License lookup guide: Idaho Contractor License Requirements
- Contract template: Idaho Homeowner-Contractor Agreement
- Idaho hub: Idaho Contractor License & Permit Hub
Information on this page was last verified: March 2026. Permit rules and fees change — confirm current requirements directly with the Twin Falls County Building Department before applying.
Frequently Asked Questions
Twin Falls County Building Permit FAQ
- 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.
- How do I apply for a building permit in unincorporated Twin Falls County, ID?
- 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.
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