Eugene allows ADUs in residential zones under Eugene Code (EC) Chapter 9 (Land Use Code), Section 9.2751. The city has progressive ADU-friendly policies aligned with Oregon HB 2001 (2019) and ORS 197.312, which require cities over 10,000 population to permit ADUs on single-family lots. Permits issue through Eugene Planning & Development Permits and Information Center.
Eugene is one of Oregon's most ADU-friendly cities and was an early adopter of streamlined ADU regulations. Eugene Code Chapter 9 (Land Use Code), Section 9.2751 governs ADU standards in residential zones (R-1, R-1.5, R-2, R-3, R-4). One ADU is permitted per single-family lot by right; Oregon HB 2001 (2019), codified at ORS 197.312, requires Eugene as a city over 10,000 population to allow at least one ADU on lots zoned for single-family residential use. Eugene allows attached, internal conversion, and detached ADUs. Maximum size is typically 800 sq ft or 10% of lot area (whichever is less) with some flexibility for internal conversions. Maximum height for detached ADUs is generally 18-25 feet depending on zone. Setbacks follow underlying zone accessory structure standards (typically 5 ft side and rear). Building, plumbing, electrical, and mechanical permits are required and reviewed under the Oregon Residential Specialty Code (ORSC) by Eugene Permits and Information Center. Pre-application conferences are encouraged.
Building or occupying an ADU without permits violates Eugene Code Chapter 9 and the Oregon Residential Specialty Code, triggering stop-work orders, daily fines, and required correction or removal. Unpermitted electrical or plumbing work voids homeowner insurance and creates title defects. Code violations through Eugene Code Compliance may be escalated to municipal court.
Eugene, OR
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Eugene, OR
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Eugene, OR
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Eugene, OR
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Eugene, OR
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Eugene, OR
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