On this page 6
When a permit is required
Permit triggers and exempt work for Dayton
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.
- 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
Note: 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.
- 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)
- 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.
Application process
Typical processing: 3-4 weeks for complete applications (including planning review, DHPC if applicable, and building code review). Resubmittals may add time.
- 01 Obtain the building permit application form from City Hall (509) 382-2361 or Columbia County Planning and Building at (509) 382-4676.
- 02 For properties in the Dayton Downtown Historic District, confirm if DHPC review is required with City Hall.
- 03 Prepare all required documents: site plan, construction plans, and project-specific materials.
- 04 Submit complete application to City of Dayton Planning and Community Development for zoning and planning review (estimated 10 business days for complete applications).
- 05 After city approval, the application is forwarded to Columbia County Planning and Building for construction code review against 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).
- 08 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.
Fee schedule
Effective Per Columbia County Resolution 2024-42
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) before budgeting.
Required inspections
Scheduling and sequence
- (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 sequence: Typical sequence for new construction: footing/foundation, framing/rough-in, insulation, and final inspection. Specific inspection stages listed on the issued permit.
Frequently asked
Common questions about Dayton permits
01 Do I need a building permit in Dayton, WA? ▸
02 How much does a building permit cost in Dayton, WA? ▸
03 How do I apply for a building permit in Dayton, WA? ▸
04 How long does it take to get a building permit in Dayton, WA? ▸
05 What work is exempt from building permits in Dayton, WA? ▸
06 How do I schedule a building inspection in Dayton, WA? ▸
Educational reference. Permit rules and fees change — confirm current requirements directly with City of Dayton Planning and Community Development / Columbia County Planning and Building Department before applying. Jaspector is not legal advice.