Dayton, WA Building Permit Guide

Permit Authority

Building permits for all properties within the incorporated City of Dayton are issued by Columbia County Planning and Building Department under an interlocal agreement. Planning and zoning review is handled by City of Dayton Planning and Community Development.

Department

City of Dayton Planning and Community Development / Columbia County Planning and Building Department

Address

111 S. 1st Street, Dayton, WA 99328 (City); 115 E. Main Street, Dayton, WA 99328 (County Building Services)

Phone

(509) 382-2361

Website

https://www.daytonwa.com/residents/permit-center/building-permits

Online Permit Portal

Application Process

1. Obtain the building permit application form from City Hall (509) 382-2361 or Columbia County Planning and Building at (509) 382-4676.
2. For properties in the Dayton Downtown Historic District, confirm if DHPC review is required with City Hall.
3. Prepare all required documents: site plan, construction plans, and project-specific materials.
4. Submit complete application to City of Dayton Planning and Community Development for zoning and planning review (estimated 10 business days for complete applications).
5. After city approval, the application is forwarded to Columbia County Planning and Building for construction code review against 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).
8. Final inspection and Certificate of Occupancy upon satisfactory completion.

Typical processing time: 3-4 weeks for complete applications (including planning review, DHPC if applicable, and building code review). Resubmittals may add time.

Source: City of Dayton Planning and Community Development / Columbia County Planning and Building Department

General Requirements

A building permit is required before erecting, constructing, enlarging, shoring, underpinning, repairing, improving, converting, or otherwise altering any building or structure within the City of Dayton.

Required Documents

• Completed building permit application form
• Site plan showing all structures, distances, proposed location, and utility lines
• Structural/construction plans
• Foundation design documentation
• Energy code compliance worksheets
• Any materials specific to project type (commercial, mechanical, plumbing, etc.)
• DHPC approval (if in historic district)

Permit validity

Permit must be obtained within 6 months of application. Issued permit expires if construction does not commence within 6 months of issuance.

Building code

2021 International Building Code (IBC) with Washington State Amendments (effective March 15, 2024)

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.

Fees

Minimum permit fee

Based on project valuation; see county fee schedule

Permit fee formula

Based on construction value; see county fee schedule PDF for complete fee tables

Reinspection fee

$75.00 minimum, up to double the original permit fee; hourly rate $65.00

Payment note

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. Verify current amounts at the official fee schedule (effective Per Columbia County Resolution 2024-42).

Work That Does NOT Require a 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

Important: Even for exempt work, the 2021 Washington State Building Code and local setback requirements still apply. If plumbing, heating, or electrical work is part of an otherwise exempt structure, those trade permits are still required. Electrical permits are always required from Washington State L&I. Confirm exemption status with City Hall or Columbia County before proceeding.

Inspections

How to Schedule

• (509) 382-3941 (phone)

Scheduling deadline

Requests must be submitted with minimum 24-hour advance notice.

Inspection hours

Monday–Thursday, 7:00 a.m.–4:00 p.m. (City Hall); Columbia County Planning and Building hours during business days.

Typical inspection sequence: Typical sequence for new construction: footing/foundation, framing/rough-in, insulation, and final inspection. Specific inspection stages listed on the issued permit.

Additional Resources

• Building code: 2021 International Building Code (IBC) with Washington State Amendments (effective March 15, 2024)
• Verify contractor license: WA L&I Contractor Lookup
• Zoning information: View zoning info
• City of Dayton Building Department
• Columbia County Planning and Building
• Dayton Historic Preservation Commission (DHPC)
• L&I Electrical Permits and Inspections
• License lookup guide: Washington Contractor License Requirements
• Contract template: Washington Homeowner-Contractor Agreement
• Washington hub: Washington Contractor License & Permit Hub

Other cities in Columbia County