County Building Permits
Washington County, ID - 2026 Building Permit Guide
How to apply for a building permit in unincorporated Washington County, Idaho. Permit authority, application steps, fees, and inspection requirements.
Idaho Updated March 2026
Permit Authority
All unincorporated areas within Washington County.
- Department
- Washington County Planning & Zoning Department
- Address
- 256 E Court Street, Weiser, ID 83672
- Phone
- 208-414-3631
Online Permit Portal
Platform: • Account required: No • Submission: In-person only
Additional resources:
Application Process
- Contact Washington County Planning & Zoning Administrator.
- Submit building permit application and plans conforming to County zoning (Title 1) and building codes (Chapter 1).
- Obtain County Road Supervisor approval for culvert installation and driveway approach onto county roads (if applicable).
- For sewer systems, obtain state Board of Health approval as condition of permit.
- County reviews plans for compliance with zoning and building codes.
- Permit issued upon plan compliance.
- Obtain required inspections before and after construction.
Typical processing time: Contact Planning & Zoning for specific timeline estimate.
General Requirements
A building permit is required for any new construction of a building or structure, additions or enlargements, alterations that change structural components or occupancy, demolition or moving of structures, changes in occupancy classification, and sewer system installation.
Required Documents
- Completed permit application
- Plans and specifications conforming to County zoning and building codes
- Site plan
- County Road Supervisor approval (for driveway/culvert access)
- State Board of Health approval (for sewer systems)
- Building code
- 2018 International Building Code (IBC) with Idaho amendments, 2018 International Existing Building Code (IEBC), 2018 International Fuel Gas Code (IFGC), 2018 International Mechanical Code (IMC), 2018 International Fire Code (IFC), 2015 International Swimming Pool and Spa Code (ISPSC), 2020 Idaho Residential Code, 2020 Idaho Energy Conservation Code
- Contractor requirements
- Contractors must register with the Idaho Contractors Board if project value exceeds $2,000.
Fees
- Minimum permit fee
- $256.00
- Permit fee formula
- Based on project valuation ($1–$2,000: $256.00 + state surcharge)
- Payment note
- Low-income fee reductions available upon HUD-standard income documentation.
Fees change. Verify current amounts at the official fee schedule.
Work That Does NOT Require a Permit
- Repairs and maintenance not involving structural changes
- Painting, wallpapering, interior decorating
- Roofing and siding replacement (preexisting openings)
- Detached accessory structures: one-story sheds, playhouses, gazebos less than 200 sq ft
- Decks and patios less than 200 sq ft and less than 30 inches high
Important: Even exempt work must comply with all building codes. Contact Washington County Planning & Zoning for specific exemptions in your jurisdiction, as they vary.
Inspections
How to Schedule
- Washington County Planning & Zoning (208-414-3631) (phone)
- 256 E Court Street, Weiser, ID 83672 (in-person)
Additional Resources
- Building code: 2018 International Building Code (IBC) with Idaho amendments, 2018 International Existing Building Code (IEBC), 2018 International Fuel Gas Code (IFGC), 2018 International Mechanical Code (IMC), 2018 International Fire Code (IFC), 2015 International Swimming Pool and Spa Code (ISPSC), 2020 Idaho Residential Code, 2020 Idaho Energy Conservation Code
- Verify contractor license: Idaho Contractors Board Registration
- Zoning information: View zoning info
- Owner-builder rules: View rules
- Idaho Code Title 54, Chapter 52 - Contractors Registration Act
- Idaho DEQ - Stormwater Permits (IPDES)
- Southwest District Health - Septic Systems
- 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 Washington County Planning & Zoning Department before applying.
Frequently Asked Questions
Washington County Building Permit FAQ
- Do I need a building permit in unincorporated Washington County, ID?
- A building permit is required for any new construction of a building or structure, additions or enlargements, alterations that change structural components or occupancy, demolition or moving of structures, changes in occupancy classification, and sewer system installation.
- How much does a building permit cost in unincorporated Washington County, ID?
- The minimum permit fee is $256.00. Fees are calculated as: Based on project valuation ($1–$2,000: $256.00 + state surcharge).
- How do I apply for a building permit in unincorporated Washington County, ID?
- 1. Contact Washington County Planning & Zoning Administrator. 2. Submit building permit application and plans conforming to County zoning (Title 1) and building codes (Chapter 1). 3. Obtain County Road Supervisor approval for culvert installation and driveway approach onto county roads (if applicable). 4. For sewer systems, obtain state Board of Health approval as condition of permit. 5. County reviews plans for compliance with zoning and building codes. 6. Permit issued upon plan compliance. 7. Obtain required inspections before and after construction.
- How long does it take to get a building permit in unincorporated Washington County, ID?
- Typical processing time is Contact Planning & Zoning for specific timeline estimate..
- What work is exempt from building permits in unincorporated Washington County, ID?
- The following work is generally exempt: Repairs and maintenance not involving structural changes; Painting, wallpapering, interior decorating; Roofing and siding replacement (preexisting openings); Detached accessory structures: one-story sheds, playhouses, gazebos less than 200 sq ft; Decks and patios less than 200 sq ft and less than 30 inches high. Note: Even exempt work must comply with all building codes. Contact Washington County Planning & Zoning for specific exemptions in your jurisdiction, as they vary.
- How do I schedule a building inspection in unincorporated Washington County, ID?
- Inspections can be scheduled via: Washington County Planning & Zoning (208-414-3631), 256 E Court Street, Weiser, ID 83672.
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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.