ADU rules in Lane County, OR — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Rural Residential (RR) lots of at least 2 acres may add one accessory dwelling unit, capped at 900 sq ft of usable floor area and located within 100 feet of the existing single-family dwelling (Lane Code 16.290, Ordinance 23-05).
Lane County allowed rural ADUs in 2023 via Ordinance 23-05, amending Lane Code 16.290. The parcel must be at least 2 acres, already hold one single-family dwelling, be served by a fire protection district, and meet sanitation, wastewater, and State Board of Forestry wildfire mitigation rules. The ADU cannot exceed 900 sq ft usable floor area, must sit within 100 feet of the primary dwelling, cannot be used for vacation occupancy, and cannot be separated from the primary dwelling by a land division. Inside cities (Eugene, Springfield, Florence), the city code governs instead.
Building or occupying an ADU without meeting LC 16.290(8) standards is a Lane Code violation subject to land-management enforcement and permit denial; unpermitted structures may require removal.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Lane County's adu rules rules stack up against other locations.
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