ADU rules in Corvallis, OR — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Under ORS 197.312(5), Oregon cities with populations over 2,500 and counties over 15,000 within urban growth boundaries must allow at least one accessory dwelling unit on each single-family lot, subject only to reasonable siting and design standards.
Oregon Senate Bill 1051 (2017) and subsequent amendments require local governments to permit ADUs on every single-family residential lot within urban growth boundaries. Cities cannot ban ADUs outright, require owner occupancy, or impose discretionary review beyond reasonable building, dimensional, and design standards. House Bill 2001 (2019) further expanded duplex and middle-housing requirements in cities over 10,000 population, and HB 3335 (2023) clarified that ADUs may be used as short-term rentals subject to local short-term rental rules. Local jurisdictions retain authority over specific design, height, setback, and parking standards within state-imposed limits.
Local ordinances that prohibit ADUs or impose unreasonable restrictions are unenforceable. Property owners may seek relief through Land Use Board of Appeals challenges under ORS 197.825.
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