Unincorporated Custer County

Building notification required for residential construction (new homes, additions, major renovations), commercial/industrial buildings, subdivisions, and most structures. An approved septic permit must be attached to the building notification per Ordinance 2007-13.

• Exempt Minor farm buildings
• Exempt Minor storage sheds under specified square footage (consult county for exact thresholds)
• Exempt Certain exempt structures per local ordinance

Note: Consult Custer County Planning & Zoning Department for specific exemption determinations. Building notification exemption does not mean exemption from zoning and planning requirements.

Building code

2018 International Building Code (IBC), 2018 International Residential Code (IRC) with Idaho state amendments.

Owner-builder

Owner-builders may install basic septic systems on their own property without hired labor; otherwise, licensed septic installer required.

Contractor requirements

Contractor registration required for projects totaling $2,000 or more (labor, materials, and all other items). Registration number must be presented before permit issuance.

1. 01
   Contact Custer County Planning & Zoning Department by phone or mail.
2. 02
   Obtain zoning compliance certificate and site evaluation form (if septic required).
3. 03
   Obtain approved septic permit from Eastern Idaho Public Health (if applicable).
4. 04
   Submit building notification application with all required documents and approved septic permit attached.
5. 05
   County reviews for zoning compliance and floodplain status.
6. 06
   County issues building notification.
7. 07
   Obtain separate electrical, plumbing, and HVAC permits from Idaho Division of Building Safety if required.

Typical processing time: Zoning certificate: 1-3 business days. Septic permit: 5-10 business days. Building notification: 2-5 business days after septic approval.

Inspection hours

Weekdays during business hours