Building Information and Resources
Columbia County is currently operating in Phase 3 of Safe Start Washington. All construction, including those activities for which social distancing may not be maintained and the start of new construction projects, is authorized to resume. ALL construction must adhere to Phase 2 Construction COVID-19 Job Site Requirements (PDF) issued May 12 and updated July 2, 2020.
The Home Builders Association of the Tri-Cities website has additional information as well as templates for the required job site postings, including a safety plan, visitors log and a toolbox training and sign-in sheet.
Building inspections will take place via Facetime, Skype, or when all social distancing guidelines can be met, to be determined by the Building Official.
Pay for your permit online with a debit or credit card via our Permit Payment page.
*Minimum $2 or 2.5% convenience fee applies.
We can also accept checks made out to Columbia County Treasurer or exact cash mailed or delivered to our office located at:
Columbia County Planning and Building
114 S 2nd Street
Dayton, WA 99328
- Building Permit Applications
- Energy Code Worksheets - Residential
- Energy Code Resources - Commercial
- Pre-application for Residential Construction (PDF)
- Climatic Criterion (PDF)
- Verify a Contractor
Please call (509) 382-3941 or email Clint Atteberry to request a building, mechanical or plumbing inspection. Please allow 24 hours notice.
Required inspections* include, but are not limited to:
- foundation walls
- underground plumbing installation and pressure test
- gas piping installation and pressure test
- rough plumbing installation and water line pressure test
- rough-in mechanical installation
- weatherproofing and framing
- drywall attachment
*Not all inspections are required for all permit types.
Electrical inspections are performed by the Washington State Department of Labor and Industries and may be requested by visiting the Department of Labor and Industries website.
For water/septic inspections contact Kevin Tureman by email or by calling (509) 524-2682.
Residential Design Requirements
Snow Load: 30 pounds per square foot below 2,500 feet above mean sea level; call (509) 382-4676 for requirements greater than 2,500 feet above mean sea level as determined by Snow Load Analysis for Washington.
Wind speed: 110 miles per hour
Seismic Category: C
Weathering Probability for Concrete: Severe
Frost Line Depth: 18 inches
Termite Potential: slight to moderate
Winter Design Temperature: 6 degrees
Ice Barrier: Not required, but recommended
Flood Hazard: FIRM, adopted 1988
Air Freezing Index: 800
Climate Zone: 5b
Insulation: Ceiling - R49; Wood Frame Wall - R 21 or R13 + R10; Floor R30; Basement Wall and Crawl Space - R15/19
Adopted Building Codes
International Building Code, Standards and amendments 2015 - WAC 51-50
International Residential Code, Standards and amendments 2015 - WAC 51-51
International Mechanical Code, Standards and amendments 2015 - WAC 51-52
International Fire Code, Standards and amendments 2015 - WAC 51-54A
Uniform Plumbing Code, Standards and amendments 2015 - WAC 51-56