State Guide · Verified 2026
Fence Installation Permits in Washington
Fences are governed mainly by local zoning, not a statewide building permit. Cities set height limits (commonly 3-4 ft in front yards and 6 ft in back and side yards), setbacks, and corner sight-line rules, and many require a zoning permit for any fence. Most jurisdictions exempt fences up to 7 ft from a building permit (IRC R105.2) and require one above that. Replacing a fence at the same height, material, and location usually needs no permit; a fence used as a pool barrier always does.
The Building Code in Washington
Washington State Building Code (Title 19 RCW, IRC-based)
Washington has a statewide building code, but fence permit thresholds and heights are set at the city and county level. Seattle has some of the most detailed fence rules in the state, enforced by its Department of Construction and Inspections (SDCI).
Who Sets the Rules
What's Different in Washington
Seattle is unusually generous: no permit for a fence up to 8 feet total, as long as no masonry or concrete section exceeds 6 feet (zoning caps solid fences at 6 ft, plus 2 ft of lattice/trellis; 4 ft in front setbacks — SMC 23.44.014). Tacoma allows up to 7 feet without a permit. Washington is also one of the few states with a codified Good Neighbor Fence Law (RCW 16.60) governing cost-sharing on boundary fences. Masonry walls over 4 ft and pool barriers always need a permit.
Counties With Their Own Rules
These Washington counties have verified, county-specific fence installation rules that differ from the state baseline:
Check Your County
Select your county for the local rule, fees, and your building department's contact details:
Building It Yourself? Here's What You'll Need
Popular tools and materials homeowners use for a fence installation project:
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Official Sources
Rules change and cities within a county may differ. This guide is general information, not legal advice — always confirm with your local building department. Reviewed by the StateDataIndex Editorial Team · Updated July 2026.