3 rules for unincorporated Washington County, Oregon.
Verified from official government sources
Washington County Community Development Code sets setbacks by zone: R-5 requires 20 ft front, 5 ft side, 15 ft rear; R-9 requires 15/5/10; AF-5 and rural require 30 ft front, 10 ft side, 30 ft rear. Cities within the county apply their own zoning.
Washington County CDC caps residential heights at 35 ft in most R zones, 45 ft in R-24/R-25+, and 50-75 ft in commercial/industrial zones near MAX corridors. Rural AF-zones allow 35 ft. Hillsboro Airport AGL limits apply on approach paths.
Washington County CDC sets maximum lot coverage from 40-60% depending on zone. R-5 and R-9 cap at 50%; higher-density R-24 zones allow up to 70%. Clean Water Services post-construction stormwater standards trigger above 1,000 sq ft new impervious.
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