Do you need a permit for a patio, walkway, or driveway in Seattle, WA?
It depends on the details of your project.
Paving 750 sq ft or more needs a grading permit.
Resurfacing existing paving needs no grading permit.
Platforms and walks more than 18 in above the ground need a building permit.
A person last checked these rules on October 19, 2026. This is guidance only, so confirm with Seattle before you build.
Check your exact lot
Your zoning district sets the setbacks, and a flood zone can change the permit answer. Enter your address to see both.
Permits a patio, walkway, or driveway can need in Seattle
| Permit | When it applies |
|---|---|
| Grading permit | Seattle requires a grading permit when you add or replace 750 sq ft or more of paving. |
| Building permit | Seattle exempts platforms and walks only up to 18 in above the ground. |
| Floodplain development permit | Paving and fill in a FEMA special flood hazard area need a floodplain permit. |
Local details
- Call 811 at least a few days before you dig footings or post holes. Utility locating is free.
- HOA covenants and deed restrictions can be stricter than city rules. Check yours before you build.
How to apply
- Seattle Services Portal
- SDCI common projects
- SMC 23.44, Neighborhood Residential
- Phone: (206) 684-8600
Common questions
- When does a patio, walkway, or driveway need a building permit in Seattle?
- Seattle exempts platforms and walks only up to 18 in above the ground. Patios, walks, and driveways 18 in or less above the ground need no building permit.
- Where do I apply for a patio, walkway, or driveway permit in Seattle?
- Apply through Seattle Services Portal, or call (206) 684-8600.
Sources
- Seattle SDCI, Paving. Checked 2026-10-22
A grading permit is required if you add or replace 750 square feet (75 feet by 10 feet) or more of paving.
- 2021 Seattle Building Code § 106.2, work exempt from permit. Checked 2026-10-22
5. Arbors and other open-framed landscape structures not exceeding 120 square feet in projected area... 8. Platforms, walks and driveways not more than 18 inches above grade and not over any basement or story below... 11. Prefabricated swimming pools, spas …
- 44 CFR 59.1, definition of development (NFIP). Checked 2026-10-19
Development means any man-made change to improved or unimproved real estate, including but not limited to buildings or other structures...
- 44 CFR 60.3, floodplain management criteria. Checked 2026-10-19
Require permits for all proposed construction or other development in the community...