Seattle generally does not require a construction permit for a fence 8 feet or lower when concrete or masonry portions are 6 feet or lower and the site is not in a flood-prone area; taller fences require a permit.
Seattle zoning height, sight-triangle, shoreline, environmentally critical area, retaining-wall, pool-barrier, and historic rules can still apply.
What this tells youComputed rule answer
How precise this isComputed rule answer
Official data checkedSeattle fences guidance
Next stepCheck official fence rules with height, location, and property constraints.
No construction permitFence 8 ft or lower, concrete/masonry portions 6 ft or lower, and not in a flood-prone area
Permit requiredFence above the exemption limits
Still verifyZoning height, corner visibility, flood/ECA, shoreline, retaining wall, and pool-barrier rules