Permits and Inspections for Concrete Work in Seattle
Last Updated: 5/11/2026Concrete permit requirements vary by city and project type. Some projects can move ahead without permits, while others require plan review and inspections. Use this guide to understand the common triggers and plan your timeline.
Projects that often require permits
- New or expanded driveways: especially if the work impacts the curb, sidewalk, or right of way.
- Structural slabs or foundations: new builds, additions, or major structural work.
- Retaining walls: taller walls or walls supporting significant loads.
- Commercial access upgrades: ADA ramps, loading areas, or site improvements.
- Drainage changes: projects that redirect water or modify grading.
Common inspection checkpoints
Inspectors may review base preparation, reinforcement placement, and overall form layout before the pour. A final inspection may occur after the concrete is placed and access points are finished.
How a contractor helps with compliance
A local contractor can advise on documentation, coordinate inspection timing, and align the work with city standards. If you are planning a driveway, patio, or foundation project, ask about permit requirements early.
Plan for added lead time
Permits and inspections can add days or weeks to the schedule depending on project complexity. Review our project timeline and curing guide to build a realistic schedule around weather and approvals.
Related Seattle permit guides
The Seattle permit landscape is split between two agencies - SDCI for buildings and structures, SDOT for the public right-of-way. The guides below cover the most common concrete-project triggers:
- Retaining wall permit guide - SDCI's four-foot rule, surcharges, and critical-area triggers.
- Driveway approach permit guide - SDOT curb cuts, ADA crossings, and Street Use review.
- Basement permit guide - SDCI structural review for slabs, underpinning, and footings.
- ECA review for concrete projects - when steep slopes, landslide areas, peat, riparian, or wetland buffers trigger extra review.
Get help from a Seattle concrete contractor
Seattle Concrete can help you evaluate permit needs and plan a smooth installation. Explore our concrete services in Seattle to get started.
Frequently asked questions
Which concrete projects need permits in Seattle?
Permits are typically required for: foundations, structural slabs, retaining walls over 4 feet, ECA work, right-of-way work (sidewalks, curb cuts, driveway approaches), and any structural alteration. Most private flatwork (driveways on your lot, patios, walkways) doesn't need a permit.
SDCI vs SDOT — what is the difference?
SDCI (Seattle Department of Construction & Inspections) handles permits on private property — foundations, retaining walls, structural work. SDOT (Seattle Department of Transportation) handles right-of-way permits — sidewalks, curb cuts, driveway approaches, anything between the property line and the street.
How much do Seattle concrete permits cost?
SDCI residential structural permits typically run $500–$3,000 plus plan review and engineering. SDOT Street Use permits for driveway approaches run $500–$2,000. Larger commercial scopes are higher. Geotech and structural engineering fees are separate.
How long does permit review take?
Routine SDCI residential structural reviews take 6–12 weeks; complex projects longer. SDOT Street Use permits for standard scope typically take 2–6 weeks. Plan for delays during peak season.
What inspections happen on a permitted concrete project?
Pre-pour inspection (forms, base, reinforcement), mid-construction inspection on phased work, and final inspection. Each is scheduled through the permit office; the contractor coordinates the holds and submits required documentation.
