Oregon's statewide building code under ORS 455.040 governs structural separation distances tied to fire safety, while zoning setbacks remain local. The Oregon Residential Specialty Code sets fire-rated wall requirements based on lot line proximity that no municipality may weaken.
ORS 455.020 establishes a uniform state building code; ORS 455.040 makes it the maximum standard for structural matters. ORSC Table R302.1 requires fire-resistance-rated exterior walls when within 5 feet of a property line, with openings prohibited under 3 feet. Cities cannot allow lesser fire separation. However, zoning setbacks (front, side, rear yard distances) are explicitly local matters under Oregon's land use planning system (ORS 197). Statewide planning Goal 10 (Housing) and recent middle-housing laws (HB 2001, 2019) preempt some restrictive local setback rules in cities over 10,000 to allow duplexes and ADUs.
Building code violations carry civil penalties up to $5,000 per day under ORS 455.895; LUBA appeals available for noncompliant local zoning.
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