Building permits and plan check in Dayton
Columbia County handles building permits for the City of Dayton. Here is what we could verify about Columbia County’s permit office, what Washington law says about plan check, and how to answer a correction letter. Each fact links to its source.
Who handles building permits in Dayton
Building permits for Dayton are handled by Columbia County, so plan check corrections and resubmittals go to Columbia County. (columbiaco.com, checked October 31, 2026)
Columbia County permit office
- Planning and Building: (509) 382-4676 (columbiaco.com, checked October 31, 2026)
- Address: 115 E Main St., Dayton, WA 99328 (columbiaco.com, checked October 31, 2026)
- Permit portal
- Building department page
Links and facts checked on October 28, 2026.
See the full Columbia County plan check guide
Dayton and Columbia County
Dayton is in Columbia County. See the Columbia County guide.
Washington rules every plan check here follows
These come from Washington law and state agencies, so they apply in Dayton as well. Each links to its source.
Building code in force
Washington's current building code is based on the 2021 model codes and took effect on March 15, 2024.
Source: Washington State Building Code Council, checked October 31, 2026
Next edition
The next update, based on the 2024 codes, is scheduled to take effect on May 3, 2027.
Source: Washington State Building Code Council, checked October 31, 2026
Local amendments
A city or county may change the state code for its own area, but its changes cannot weaken the code's minimum standards.
Source: Washington State Legislature, RCW 19.27.040, checked October 31, 2026
Rules are locked in when you apply
A complete building permit application is reviewed under the building and zoning rules that were in effect on the date it was filed.
Source: Washington State Legislature, RCW 19.27.095, checked October 31, 2026
What a good response to plan check corrections has
General guidance, not the City of Dayton’s own rules. Check its page before you resubmit.
- Answer every comment, in the reviewer’s order and numbering, so nothing is missed.
- Say plainly what you changed for each comment, or why no change is needed.
- Name the sheet and detail where each change is, so the reviewer can find it fast.
- Mark changes on the drawings (clouds or deltas are common) and keep sheet numbers the same.
- Send the response letter, the revised drawings and any new calculations together.
Other Washington city guides
How we help
Send us the whole correction letter. We draft a response to every comment and list the drawing changes sheet by sheet. Your first letter is free. You review each response, then you sign and submit to the City of Dayton yourself.
Cleared to Build is an independent service. We are not the City of Dayton and are not affiliated with it.
Upload your correction letterOnly one comment to answer? Try the free one-comment tool.
Questions
Who handles building permits in Dayton?
Columbia County does. Send plan check corrections and resubmittals to Columbia County, the way its own pages ask.
Is Cleared to Build part of the City of Dayton or Columbia County?
No. Cleared to Build is an independent service, not affiliated with the City of Dayton, Columbia County or any permitting agency. You submit yourself.