Idaho County, ID - 2026 Building Permit Guide

Permit Authority

Unincorporated areas of Idaho County. Local building permits are not required; only state-level permits (electrical, plumbing, HVAC, wells, septic, stormwater) apply.

Department

Idaho County Board of Commissioners

Address

320 W. Main St., Grangeville, Idaho 83530

Phone

208-983-2751

Website

https://idahocounty.org/

Application Process

1. Verify state-level permit requirements (electrical, plumbing, HVAC, wells, septic, stormwater if applicable).
2. Determine if state-level permits apply to your project based on trade and scope.
3. Contact relevant state agencies: Idaho Division of Building Safety (IDBS), Idaho Department of Water Resources (IDWR), North Central Health District, or Idaho DEQ.
4. Submit state permit applications directly to the respective agency.
5. Obtain state permits before commencing work.

Typical processing time: Varies by state agency; typically 2-4 weeks for trades permits, 1-2 weeks for septic/well permits.

Source: Idaho County Board of Commissioners

General Requirements

No local building permit is required for construction in unincorporated Idaho County. State-level permits are required for electrical, plumbing, HVAC installations; wells; septic systems; and stormwater disturbance (1+ acre).

Building code

2018 International Building Code (IBC) and 2018 International Residential Code (IRC) with Idaho amendments apply statewide for work requiring state permits.

Contractor requirements

Contractors must register with the Idaho Contractors Board if work valued at $2,000 or more (materials + labor combined). Registration required under Idaho Code Title 54, Chapter 52. All electrical, plumbing, and HVAC work must be performed by individuals holding state trade licenses.

Fees

Payment note

Fees vary by state agency. IDBS trades permits: variable. IDWR well permits: $75 for residential domestic wells. Septic permits: contact North Central Health District.

Work That Does NOT Require a Permit

• General construction (residential, commercial, industrial)
• Building additions and alterations
• Demolition
• Sheds under 200 sq. ft. (single-story detached, no loft or sleeping use)
• Decks under 200 sq. ft., under 30 inches high, not attached to dwelling

Important: Exemptions apply only to local permits. State-level permits may still be required for electrical, plumbing, HVAC, wells, septic systems, and stormwater depending on project scope. Contact state agencies for clarification.

Inspections

How to Schedule

Typical inspection sequence: No local inspections. State agencies conduct inspections for their respective trades (electrical, plumbing, HVAC, wells, septic, stormwater).

Additional Resources

• Building code: 2018 International Building Code (IBC) and 2018 International Residential Code (IRC) with Idaho amendments apply statewide for work requiring state permits.
• Verify contractor license: Idaho Contractors Board Registration
• Zoning information: View zoning info
• Idaho County Planning & Zoning
• Idaho Division of Building Safety (IDBS)
• Idaho Department of Water Resources (IDWR)
• North Central Health District — Septic
• Idaho DEQ — Stormwater Permits
• License lookup guide: Idaho Contractor License Requirements
• Contract template: Idaho Homeowner-Contractor Agreement
• Idaho hub: Idaho Contractor License & Permit Hub

Frequently Asked Questions

Idaho County Building Permit FAQ

Do I need a building permit in unincorporated Idaho County, ID?

No local building permit is required for construction in unincorporated Idaho County. State-level permits are required for electrical, plumbing, HVAC installations; wells; septic systems; and stormwater disturbance (1+ acre).

How do I apply for a building permit in unincorporated Idaho County, ID?

1. Verify state-level permit requirements (electrical, plumbing, HVAC, wells, septic, stormwater if applicable). 2. Determine if state-level permits apply to your project based on trade and scope. 3. Contact relevant state agencies: Idaho Division of Building Safety (IDBS), Idaho Department of Water Resources (IDWR), North Central Health District, or Idaho DEQ. 4. Submit state permit applications directly to the respective agency. 5. Obtain state permits before commencing work.

How long does it take to get a building permit in unincorporated Idaho County, ID?

Typical processing time is Varies by state agency; typically 2-4 weeks for trades permits, 1-2 weeks for septic/well permits..

What work is exempt from building permits in unincorporated Idaho County, ID?

The following work is generally exempt: General construction (residential, commercial, industrial); Building additions and alterations; Demolition; Sheds under 200 sq. ft. (single-story detached, no loft or sleeping use); Decks under 200 sq. ft., under 30 inches high, not attached to dwelling. Note: Exemptions apply only to local permits. State-level permits may still be required for electrical, plumbing, HVAC, wells, septic systems, and stormwater depending on project scope. Contact state agencies for clarification.