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§ 02
When a permit is required
Permit triggers and exempt work for Columbia County
Per Columbia County Code Chapter 15.10, no owner or authorized agent may erect, construct, enlarge, shore, underpin, repair, improve, convert, or otherwise alter any building or structure without first obtaining a building permit.
One-story detached accessory structures (tool sheds, storage sheds, playhouses) not exceeding 200 sq. ft. of floor area
Fences not over 6 feet in height
Retaining walls not over 4 feet in height (measured from footing bottom to wall top), not supporting a surcharge
Painting, papering, tiling, carpeting, cabinets, countertops, and similar finish work
Prefabricated swimming pools less than 24 inches in depth
Swings and playground equipment
Agricultural structures used exclusively for agricultural purposes (equipment storage, farm vehicle parking) where no one lives, structure not open to public, and no agricultural product processing or packaging occurs
- Exempt One-story detached accessory structures (tool sheds, storage sheds, playhouses) not exceeding 200 sq. ft. of floor area
- Exempt Fences not over 6 feet in height
- Exempt Retaining walls not over 4 feet in height (measured from footing bottom to wall top), not supporting a surcharge
- Exempt Painting, papering, tiling, carpeting, cabinets, countertops, and similar finish work
- Exempt Prefabricated swimming pools less than 24 inches in depth
- Exempt Swings and playground equipment
- Exempt Agricultural structures used exclusively for agricultural purposes (equipment storage, farm vehicle parking) where no one lives, structure not open to public, and no agricultural product processing or packaging occurs
Note: Even for exempt work, the 2021 Washington State Building Code and local setbacks must be met. If plumbing, heating, or electrical work is part of an otherwise exempt structure, those trade permits are still required. All electrical work requires Washington State L&I permits. Agricultural structure exemptions are fact-specific — obtain written confirmation from Columbia County before assuming exemption.
Required documents
- Completed building permit application form
- Site plan showing all structures on the parcel with distances; location of proposed structure; location of water/well, sewer/septic, gas, and electrical lines and connections; location of decks, retaining walls, and significant landscape elements; location and dimensions of all easements
- Structural/construction plans
- Foundation design documentation
- Energy code compliance worksheets (available at https://www.columbiaco.com/507/Building-Information-and-Resources)
- Any materials specific to project type (commercial, mechanical, plumbing, etc.)
- Commercial Building Permit form for commercial projects (revised November 2025)
- Building code
- 2021 International Building Code (IBC) with Washington State Amendments (effective March 15, 2024)
- Permit validity
- Permit must be obtained within 6 months of application. Issued permit expires if construction does not commence within 6 months of issuance.
- Owner-builder
- Owner-builders may apply for their primary residence; confirm eligibility with Columbia County Planning and Building at (509) 382-4676.
- Contractor requirements
- All contractors must hold a valid Washington State L&I registration number. Registration number must appear on all advertising, bids, vehicles, and online presence.
§ 03
Application process
Typical processing: 2-3 weeks for complete applications. Review time depends on project complexity and whether SEPA, shoreline, or critical areas review is required.
- 01 Download or obtain building permit application forms from https://www.columbiaco.com/511/Building-Permit-Applications
- 02 Contact Columbia County Planning and Building at (509) 382-4676 to confirm requirements for your specific project type.
- 03 Prepare all required documents: site plan, construction plans, foundation design, energy code worksheets, and project-specific materials.
- 04 Submit the complete application package in person at 115 E. Main Street, by mail, or via email. Email submissions must be under 20 MB per email.
- 05 Staff will confirm receipt within two business days and initiate review for compliance with zoning, Comprehensive Plan, critical areas, shoreline management code, SEPA, flood hazard zones, and the 2021 Washington State Building Code.
- 06 Permit is issued upon completion of all reviews. Fees are due at issuance.
- 07 Contact (509) 382-3941 to schedule inspections (minimum 24-hour advance notice). The permit will list all required inspection stages.
- 08 Final inspection and Certificate of Occupancy upon satisfactory completion.
Typical processing time: 2-3 weeks for complete applications. Review time depends on project complexity and whether SEPA, shoreline, or critical areas review is required.
§ 04
Fee schedule
Effective Per Columbia County Resolution 2024-42, Exhibit B
Fee type
Amount
01
Minimum permit fee
Based on project valuation; see county fee schedule
02
Permit fee formula
Based on construction value; see county fee schedule PDF for complete fee tables
03
Reinspection fee
$75.00 minimum, up to double the original permit fee; hourly rate $65.00
Online payment via Point & Pay (2.5% convenience fee, $2.00 minimum). Also accepts checks payable to Columbia County Treasurer or exact cash in person.
Fees change periodically. Confirm at the official fee schedule ↗ (effective Per Columbia County Resolution 2024-42, Exhibit B) before budgeting.
§ 05
Required inspections
Scheduling and sequence
How to schedule
- (509) 382-3941 (phone)
- Scheduling deadline
- Requests must be submitted with minimum 24-hour advance notice.
- Inspection hours
- Monday–Friday, business hours; Columbia County Planning and Building hours.
Typical sequence: Typical sequence for new construction: footing/foundation, framing/rough-in, insulation, and final inspection. Specific inspection stages listed on the issued permit.
§ 06
Frequently asked
Common questions about unincorporated Columbia County permits
01 Do I need a building permit in unincorporated Columbia County, WA? ▸
Per Columbia County Code Chapter 15.10, no owner or authorized agent may erect, construct, enlarge, shore, underpin, repair, improve, convert, or otherwise alter any building or structure without first obtaining a building permit.
02 How much does a building permit cost in unincorporated Columbia County, WA? ▸
Building permit fees in unincorporated Columbia County, WA are set by the local building department and vary by project type and valuation. The minimum permit fee is Based on project valuation; see county fee schedule. Fees are calculated as: Based on construction value; see county fee schedule PDF for complete fee tables.
03 How do I apply for a building permit in unincorporated Columbia County, WA? ▸
To apply for a building permit in unincorporated Columbia County, WA, follow these steps: 1. Download or obtain building permit application forms from https://www.columbiaco.com/511/Building-Permit-Applications 2. Contact Columbia County Planning and Building at (509) 382-4676 to confirm requirements for your specific project type. 3. Prepare all required documents: site plan, construction plans, foundation design, energy code worksheets, and project-specific materials. 4. Submit the complete application package in person at 115 E. Main Street, by mail, or via email. Email submissions must be under 20 MB per email. 5. Staff will confirm receipt within two business days and initiate review for compliance with zoning, Comprehensive Plan, critical areas, shoreline management code, SEPA, flood hazard zones, and the 2021 Washington State Building Code. 6. Permit is issued upon completion of all reviews. Fees are due at issuance. 7. Contact (509) 382-3941 to schedule inspections (minimum 24-hour advance notice). The permit will list all required inspection stages. 8. Final inspection and Certificate of Occupancy upon satisfactory completion.
04 How long does it take to get a building permit in unincorporated Columbia County, WA? ▸
Building permit processing times in unincorporated Columbia County, WA typically run 2-3 weeks for complete applications. Review time depends on project complexity and whether SEPA, shoreline, or critical areas review is required.. Timelines can vary based on project complexity and current department workload.
05 What work is exempt from building permits in unincorporated Columbia County, WA? ▸
Not all construction work requires a permit in unincorporated Columbia County, WA. The following work is generally exempt: One-story detached accessory structures (tool sheds, storage sheds, playhouses) not exceeding 200 sq. ft. of floor area; Fences not over 6 feet in height; Retaining walls not over 4 feet in height (measured from footing bottom to wall top), not supporting a surcharge; Painting, papering, tiling, carpeting, cabinets, countertops, and similar finish work; Prefabricated swimming pools less than 24 inches in depth; Swings and playground equipment; Agricultural structures used exclusively for agricultural purposes (equipment storage, farm vehicle parking) where no one lives, structure not open to public, and no agricultural product processing or packaging occurs. Note: Even for exempt work, the 2021 Washington State Building Code and local setbacks must be met. If plumbing, heating, or electrical work is part of an otherwise exempt structure, those trade permits are still required. All electrical work requires Washington State L&I permits. Agricultural structure exemptions are fact-specific — obtain written confirmation from Columbia County before assuming exemption. When in doubt, confirm with the local building department before starting work.
06 How do I schedule a building inspection in unincorporated Columbia County, WA? ▸
Once your permit is issued and work reaches an inspection milestone, you can schedule a building inspection in unincorporated Columbia County, WA via: (509) 382-3941. Requests must be submitted with minimum 24-hour advance notice..
last verified April 2026
source Columbia County Planning and Building Department ↗
entry id permits/washington/columbia/unincorporated
Educational reference. Permit rules and fees change — confirm current requirements directly with Columbia County Planning and Building Department before applying. Jaspector is not legal advice.