Do you need a permit for a fence in Seattle, WA?
It depends on size and placement.
No permit for fences up to 8 ft, as long as masonry or concrete parts stay at 6 ft or under.
Zoning caps fences at 6 ft, plus 2 ft of arbors or trellis.
In a front or street-side setback the cap is 4 ft.
Rules last checked by a person on October 19, 2026. Guidance only; confirm with Seattle before you build.
Check your exact lot
Setbacks depend on your zoning district, and a flood zone can change the permit answer. Enter your address to see both.
Permits a fence can need in Seattle
| Permit | When it applies |
|---|---|
| Building permit | Seattle requires a construction permit for fences over 8 ft, masonry or concrete over 6 ft, or any fence in a flood-prone area. |
| Floodplain development permit | If the lot is in a FEMA special flood hazard area, all development there needs a permit. |
Limits that apply citywide
| Side and rear (NR and multifamily zones) | 6 ft, plus 2 ft of arbor or trellis |
|---|---|
| Front or street-side setback | 4 ft max |
| Sloping site | Up to 8 ft if the average between posts is 6 ft |
| On a retaining wall that raises grade | Wall plus fence capped at 9 ft 6 in |
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
Questions people ask
- When does a fence need a building permit in Seattle?
- Seattle requires a construction permit for fences over 8 ft, masonry or concrete over 6 ft, or any fence in a flood-prone area. Fences up to 8 ft with no masonry or concrete over 6 ft need no permit. Zoning still caps most fences at 6 ft.
- Where do I apply for a fence permit in Seattle?
- Apply through Seattle Services Portal, or call (206) 684-8600.
Sources
- Seattle SDCI, Fences. Checked 2026-10-19.
You don't need a permit if you're building a fence with a total height of 8 feet high or less that doesn't have masonry or concrete elements over 6 feet... In neighborhood residential and multifamily zones, our zoning code limits your fence height to 6 feet…
- 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...