Do you need a permit for a pergola, play set, or carport in Seattle, WA?
It depends on the details of your project.
Arbors and pergolas up to 120 sq ft are exempt.
Play equipment and tree houses are exempt.
Arbors over 120 sq ft 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 pergola, play set, or carport can need in Seattle
| Permit | When it applies |
|---|---|
| Building permit | Seattle exempts arbors and other open-framed structures only up to 120 sq ft. |
| Electrical permit | Lights, fans or outlets need an electrical permit.Medium confidence |
| Floodplain development permit | Structures 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 pergola, play set, or carport need a building permit in Seattle?
- Seattle exempts arbors and other open-framed structures only up to 120 sq ft. Play equipment and tree houses, and open-framed structures up to 120 sq ft, need no permit in Seattle.
- Where do I apply for a pergola, play set, or carport permit in Seattle?
- Apply through Seattle Services Portal, or call (206) 684-8600.
Sources
- 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 …
- 2024 IRC R105.2, Work exempt from permit (text published by the City of Benson, AZ). Checked 2026-10-19
One-story detached accessory structures, provided that the floor area does not exceed 200 square feet. Fences not over 7 feet high. Decks not exceeding 200 square feet in area, that are not more than 30 inches above grade at any point, are not attached to a…
- 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...