Concrete Slab Permit Requirements in Bothell, WA
ZIP 98012 straddles City of Bothell and unincorporated Snohomish County (Mill Creek / Canyon Park). Bothell itself spans King + Snohomish counties. Inside city limits: Bothell Permit Center. Outside city limits in 98012: Snohomish County PDS. All Bothell applications run through mybuildingpermit.com (regional portal). Electrical permits via WA L&I, not the city. 2021 International Codes effective in Bothell since March 15, 2024.
By Joey, Founder · Last verified May 28, 2026 · How we research →
When you don’t need a Concrete Slab permit
WA (covering parts of ZIP 98012), small at-grade concrete slabs (patios, walkways, generator pads) under approximately 200 sq ft typically don't require a building permit. Larger slabs intended as a future structure foundation require permits. Verify impervious-surface coverage against Bothell's stormwater code; new slabs may push the lot over its allowed coverage and trigger drainage review. Critical-areas buffers along North Creek and Sammamish River may add review.
Concrete Slab Permit Costs: Bothell vs. Nearby
| City | Estimated Fee |
|---|---|
| Bothell | N/A |
| Seattle | $75 – $600 |
| Spokane | $75 – $600 |
| Tacoma | $75 – $600 |
Fees shown are estimates based on local building code data. Actual fees may vary based on project scope and valuation. See all Bothell permit costs →
Zoning & HOA Considerations
Concrete slabs contribute to impervious surface coverage. Austin, Portland, Seattle, and many coastal cities cap impervious cover at 40-65% of lot area. Sidewalks and curb cuts in the public right-of-way always require a separate Public Works encroachment permit.
If you live in an HOA community: hOAs may restrict new concrete installations, especially front-yard additions visible from the street. Changes to driveway width or walkway placement typically need ARC approval.
Estimated Project Timeline
Here's a typical timeline for a concrete slab project:
Need a Concrete Slab permit?
Answer a few quick questions for a personalized answer about your specific project.
Check Now, Free →Building Department Contact
Frequently Asked Questions
Contact the building department for current Concrete Slab permit fee information. Fees typically vary based on project scope and valuation.
It depends on the specifics of your project. Some smaller Concrete Slab projects may be exempt from permit requirements, while larger ones typically require a permit. Use our free lookup tool to check your specific situation.
Working without a required permit can result in fines, stop-work orders, being required to remove completed work, and complications when selling your home. It's always best to check first.
Contact the building department for current processing times. Timelines vary based on project complexity and whether plan review is required.
If you live in an HOA community, you may need architectural review approval in addition to a building permit. HOA rules and city building codes are separate, you may need to satisfy both. Review your CC&Rs and submit to your HOA's architectural review committee before starting work.
Learn More About Concrete Slab Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read Concrete Slab Guide →