6 county-level rules, plus city-specific rules for 4 cities in Washington County, Oregon.
Verified from official government sources
Fence height in unincorporated Washington County is regulated by the Community Development Code. Fences over 7 feet require a building permit. Specific setback requirements vary by land use district and zone.
Building permits are required for fences over 7 feet. Retaining walls over 4 feet require permits. Land development and construction without required permits is a violation of both the CDC and Building Code. The county enforces retroactive permitting.
Oregon does not have a shared fence cost statute. Each property owner is responsible for their own fence. Rural and agricultural properties may reference ORS 105.175–105.190 line fence statutes. Spite fences may be actionable as nuisance under common law.
Washington County requires a building permit for retaining walls over 4 feet tall measured from the bottom of foundation to top of wall (CDC 419-4). Walls supporting surcharge loads or taller than 4 feet require engineered plans stamped by a licensed Oregon PE.
Washington County requires pool and spa barriers meeting Oregon Residential Specialty Code Appendix G / Chapter 42. Minimum 48-inch barrier with self-closing, self-latching gate. Inspected at building permit.
Washington County Community Development Code §411 permits standard residential fencing materials — cedar, vinyl, composite, wrought iron — and prohibits barbed wire and razor wire in residential zones. Cedar dominates due to the wet Willamette Valley climate; chain-link is allowed but discouraged in front yards.
4 cities in Washington County have their own fence regulations rules. Each link goes to that city's dedicated page with code citations.
See every category we cover for Washington County — parking, noise, fences, fires, animals, pools, and more.
Washington County Ordinance Hub →