Island County, WA Fence Regulations: Neighbor Fence Rules (2026)
Key Facts
- Property-line fences
- Allowed outright, no setback
- Covenant enforcement
- County does not enforce covenants
- Corner-lot sight triangle
- 2.5 ft max obstruction height
- Governing section
- ICC § 17.03.180.S.7.e
Summary
Unincorporated Island County does not require fences to sit inside a property's building setback: Island County Code section 17.03.180.S.7.e states plainly that "fences, retaining walls and similar structures may be built on the property line," one of the code's general exceptions to its standard yard setback rules.
7.General exceptions to setback requirements:a.Setbacks in excess of those established by this chapter may be required in conformance with restrictive covenants. This determination shall be made by the property owner. Note: Island County does not enforce restrictive covenants. ... e.Fences, retaining walls and similar structures may be built on the property line.
Full Breakdown
" That exempts fences and retaining walls from the setback distances that otherwise apply to buildings in the county's Rural, Rural Residential and other zoning districts, meaning a landowner does not need the county's permission to place a fence directly on the boundary shared with a neighbor. The same subsection notes that "setbacks in excess of those established by this chapter may be required in conformance with restrictive covenants," but adds that "Island County does not enforce restrictive covenants," so any dispute over a covenant-based fence setback is a private civil matter between property owners rather than a county code enforcement issue.
5 feet within the sight-distance area near street intersections. Outside that corner-lot sight-triangle rule, a fence built exactly on the line is allowed outright, and disputes over who pays for it or where the true boundary lies are resolved through survey and civil court, not through Planning and Community Development.
Violations & Fines
Building a fence over 2.5 feet tall inside the clear-vision sight triangle at a corner lot under section 17.03.180.S.6 is a code violation Planning and Community Development can require the owner to correct, since obstructions of that height are barred from the sight-distance area regardless of the property-line fence allowance. Ordinary boundary fence placement itself is not a violation under this section; disputes over encroachment past the true property line or over shared repair costs are civil matters, not county code enforcement matters.
Frequently Asked Questions
Can I build a fence right on my property line in Island County?
Will the county enforce a restrictive covenant that requires a bigger fence setback?
Are there any limits on fences built on the property line?
Sources & Official References
Other rules in Island County
Compare Island County to another location·View the Washington fence regulations overview
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