City Building Permits

Lost River, ID - 2026 Building Permit Guide

How to apply for a building permit in Lost River, Idaho. Permit authority, application steps, fees, and inspection requirements.

Idaho Custer County Updated March 2026

Permit Authority

All properties within the incorporated City of Lost River. NOTE: City is currently governmentally inactive; jurisdiction likely defaults to Custer County unincorporated standards.

Department
City of Lost River — Custer County Planning & Zoning (See Note)
Address
PO Box 385, Challis, ID 83226
Phone
208-879-2379
Website
https://custercountyidaho.org

Application Process

  1. Contact Custer County Planning & Zoning Department (208-879-2379) to determine current jurisdiction and permitting requirements.
  2. Follow unincorporated Custer County process or specific Lost River procedures if city has reactivated governance.
  3. Obtain zoning compliance certificate if required.
  4. Obtain approved septic permit from Eastern Idaho Public Health if applicable.
  5. Submit building notification application with all required documents.
  6. County reviews and issues building notification.
  7. Obtain electrical, plumbing, and HVAC permits from Idaho Division of Building Safety if required.

Typical processing time: Depends on current jurisdiction; recommend contacting county for timeline estimates.

Source: City of Lost River — Custer County Planning & Zoning (See Note)

General Requirements

Building notification/permit requirements depend on current jurisdictional status. City of Lost River is officially incorporated but currently governmentally inactive (no elected officials or municipal staff actively conducting business). Default to unincorporated Custer County standards for most properties.

Required Documents

  • Building notification application form
  • Site plan or sketch
  • Proof of property ownership
  • Approved septic permit (if applicable)
  • Zoning compliance certification (if required)
Building code
2018 International Building Code (IBC), 2018 International Residential Code (IRC) with Idaho state amendments.
Contractor requirements
Contractor registration required for projects $2,000 or more per Idaho Code § 54-52. Registration number must be presented before permit issuance.

Fees

Payment note
Fees depend on current jurisdiction; contact Custer County for specifics.

Work That Does NOT Require a Permit

Contact the City of Lost River — Custer County Planning & Zoning (See Note) to confirm whether your project requires a permit before starting work.

Inspections

How to Schedule

Inspection hours
Contact Custer County

Additional Resources

Information on this page was last verified: March 2026. Permit rules and fees change — confirm current requirements directly with the City of Lost River — Custer County Planning & Zoning (See Note) before applying.

Frequently Asked Questions

Lost River Building Permit FAQ

Do I need a building permit in Lost River, ID?
Building notification/permit requirements depend on current jurisdictional status. City of Lost River is officially incorporated but currently governmentally inactive (no elected officials or municipal staff actively conducting business). Default to unincorporated Custer County standards for most properties.
How do I apply for a building permit in Lost River, ID?
1. Contact Custer County Planning & Zoning Department (208-879-2379) to determine current jurisdiction and permitting requirements. 2. Follow unincorporated Custer County process or specific Lost River procedures if city has reactivated governance. 3. Obtain zoning compliance certificate if required. 4. Obtain approved septic permit from Eastern Idaho Public Health if applicable. 5. Submit building notification application with all required documents. 6. County reviews and issues building notification. 7. Obtain electrical, plumbing, and HVAC permits from Idaho Division of Building Safety if required.
How long does it take to get a building permit in Lost River, ID?
Typical processing time is Depends on current jurisdiction; recommend contacting county for timeline estimates..
What work is exempt from building permits in Lost River, ID?
The following work is generally exempt: Minor repairs and maintenance; Minor farm buildings. Note: City of Lost River is governmentally inactive. Contact Custer County Planning & Zoning to determine exemptions and current procedures.

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Important: This page is an educational resource provided by jaspector.com. It is not legal advice, and it does not substitute for official guidance from the permit authority listed above. Permit requirements, fees, and processes change frequently. Always verify current requirements directly with the issuing department before beginning any construction project. Use of this page does not create an attorney-client relationship. Jaspector assumes no liability for any outcomes arising from reliance on this information.

Other cities in Custer County

Unincorporated Area Challis Mackay
View all Custer County jurisdictions →