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 based on the 2021 IBC and IRC, which all cities and counties must adopt and enforce. Local jurisdictions may amend it but cannot adopt standards less strict than the state baseline. Fence permit thresholds and heights, however, are set at the city and county level.
Quick Facts
Who Sets the Rules
Seattle sets an unusually high bar
Seattle requires no permit for a fence up to 8 feet total, as long as no masonry or concrete section exceeds 6 feet. Zoning separately caps solid fences at 6 feet plus 2 feet of lattice or trellis, and 4 feet within front setbacks (SMC 23.44.014). Tacoma allows up to 7 feet without a permit. These are among the most permissive big-city thresholds in the country.
The county rules follow the same pattern
Snohomish County exempts fences 8 feet or less provided no masonry or concrete element rises above 6 feet, and the fence is not in a flood hazard or critical area. It adds a specific corner-lot rule: where the street corner angle sides measure 40 feet or less, nothing over 4 feet may stand in the sight-clearance triangle. A fence built on top of a retaining wall has its height measured from the uphill side.
The cost-sharing law is narrower than it sounds
RCW 16.60.020 is widely described online as Washington's "Good Neighbor Fence Law," but the statute sits in Title 16, the state's animals and livestock code. It says that when one owner builds a fence on the boundary line and the adjoining owner later encloses their own land so the fence also serves them, that neighbor pays half the value of the shared portion. The obligation only triggers if the neighbor actually encloses their side.
What the statute means by "fence"
RCW 16.60.010 defines a lawful fence as at least four horizontal barbed wires, the top one 48 inches above ground (plus or minus four inches), with the others spaced 12, 22, and 32 inches below it, fastened to posts no more than 24 feet apart. That is ranch fencing, not a cedar privacy fence. The practical consequence: in a typical residential neighborhood, there is no Washington statute that automatically forces a neighbor to split the cost, and a written agreement is the only reliable route.
Spite fences can be ordered removed
Separately from the partition fence statute, RCW 7.40.030 lets a court order the removal of a fence erected purely out of spite. This is an injunctive remedy rather than a height rule, so a fence that complies with every local zoning requirement can still be actionable if its purpose is to injure a neighbor.
What people get wrong
The most common error is assuming the "Good Neighbor Fence Law" makes a suburban neighbor liable for half of a privacy fence. It generally does not, given how the statute defines a lawful fence and when the obligation triggers. The second is assuming a city can go below the state code: Washington cities may amend the building code but cannot adopt standards weaker than the state baseline.
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
- Seattle SDCI — Fences
- RCW 16.60.020 — Partition fence, reimbursement
- Washington State Building Code Council
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 September 2026.