ADU Regulations in Eugene, Oregon
Updated September 29, 2026
Home to the University of Oregon in Lane County, Eugene permits ADUs by right under Oregon's HB 2001 (2019), which requires cities to allow ADUs in all residential zones. The city's progressive housing policies make ADU development straightforward for most property owners.
Below is a summary of the key zoning rules applicable to Accessory Dwelling Units in Eugene as of 2026. Regulations are governed by Oregon's HB 2001 (2019) which requires ADU approval by-right in all residential zones statewide.
| Regulation | Requirement |
|---|---|
| Maximum Size | 1,200 sq ft |
| Property Setbacks | 5 ft rear, 5 ft side |
| Extra Parking Required | Not required |
| Owner Occupancy | Not required |
Additional Local Requirements for Eugene
- ADU by right in all residential zones (Oregon HB 2001)
- Minimum 200 sq ft
- System development charges may apply
- Owner occupancy not required
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Can I build an ADU in Eugene?
Eugene allows ADUs by right under Oregon's HB 2001. No owner occupancy requirement and parking is generally not required.
What is the maximum ADU size allowed in Eugene?
ADUs in Eugene can be up to 1,200 square feet, subject to the property's zoning and lot coverage limits. Always confirm the exact allowed size with the Eugene planning department before designing your project.
What are the setback requirements for an ADU in Eugene?
ADUs in Eugene generally require setbacks of 5 ft rear, 5 ft side. Oregon's HB 2001 (2019) requires cities to allow ADUs in residential zones, but the exact setback figures come from Eugene's own code — confirm them with the city before you design.
Disclaimer: This guide summarises publicly available city zoning rules and is for general information only — it is not legal or architectural advice. Codes change; always confirm current requirements with the Eugene planning department before you design or build.