Accessory Structures in Eugene, OR: What Residents Actually Need to Know

If you live in Eugene or are thinking about moving there, accessory structures are one of those things you probably won't think about until they affect you directly. Eugene has 8 specific rules on the books covering different aspects of accessory structures, and some of them might surprise you.

Garage Conversions

Garage conversions in Eugene require building permits. Oregon ADU law encourages garage-to-ADU conversions and limits parking replacement requirements.

Key details: Building Permit: Required. Parking Replacement: Limited by Oregon ADU law. Standards: Oregon Residential Specialty Code. City Support: Eugene encourages ADU development.

Unpermitted conversions face code compliance action. Non-compliant spaces must be restored or properly permitted.

ADU Rules

Eugene permits ADUs per Oregon state law (ORS 197.312). Both attached and detached ADUs are allowed. Detached ADUs up to 800 sq ft. Oregon prohibits cities from requiring owner-occupancy.

Key details: Detached ADU: Up to 800 sq ft. Attached ADU: 50% of primary or 800 sq ft max. Owner Occupancy: Cannot be required per state law. State Law: ORS 197.312. Parking: Additional parking often not required.

Unpermitted ADUs face code compliance action. Units not meeting building code may be ordered vacated.

Carport Rules

Eugene Land Use Code Chapter 9 treats carports as accessory structures subject to Table 9.2750 development standards. In R-1 (single-family) zones the frontmost support post must sit at least 18 feet from the front lot line - measured through the centerline of the driveway - and at least 5 feet from interior side lot lines. Eaves may project up to 2 feet into an interior yard and 5 feet into the front yard under EC 9.6745.

Key details: Code: EC 9.2750 / 9.2751 / 9.6745. Front Setback (R-1): 18 ft (driveway centerline). Interior Side: 5 ft minimum. Eave Projection: 2 ft side / 5 ft front. Reference Doc: Carport Packet GI-324.

Building a carport that violates the 18-foot driveway-centerline setback, the 5-foot interior side setback, or the lot-coverage cap in Table 9.2750, or that is built without the required Building and Permit Services permit, is enforceable under EC Chapter 9 and the Oregon Residential Specialty Code. Code Compliance can issue stop-work orders and require relocation, modification, or removal at the owner's expense.

ADU Permits

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.

Key details: Code Section: EC 9.2751. ADUs Per Lot: 1 by right (ORS 197.312). Max Size: ~800 sq ft typical. State Mandate: OR HB 2001 (2019). Permit Authority: Eugene Permits & Information Center.

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 is more permissive than most cities when it comes to adu permits. That said, there are still limits.

ADU Owner Occupancy

Eugene does not require owner-occupancy for ADU construction or long-term rental. Oregon HB 2001 (2019), codified at ORS 197.312, preempts local owner-occupancy mandates on ADUs in cities over 10,000 population. Oregon HB 3197 (2023) further clarified ADU rental rights. Investor-owned ADUs may be rented to long-term tenants without owner residence.

Key details: State Preemption: ORS 197.312 / HB 2001. Owner-Occupancy: Not required. HB 3197 (2023): Clarifies rental rights. Investor ADUs: Permitted. Rent Stabilization: Statewide SB 608 / SB 611.

Cities or HOAs attempting to enforce owner-occupancy on ADUs in violation of ORS 197.312 face state preemption challenges. Eugene does not enforce owner-occupancy for ADUs. Tenant lease violations and Oregon Residential Landlord and Tenant Act (ORS Chapter 90) compliance remain enforceable in standard landlord-tenant proceedings.

The rules around adu owner occupancy in Eugene lean permissive, but that does not mean anything goes.

ADU Impact Fees

Eugene assesses System Development Charges (SDCs) on new ADUs covering wastewater, stormwater, parks, and transportation. Smaller ADUs receive reduced SDC assessments under Eugene Code Chapter 7 (Public Improvements). State law also imposes the School Construction Excise Tax. Building permit fees scale with construction valuation. Total fees for a typical ADU range from approximately $8,000 to $18,000.

Key details: SDC Authority: Eugene Code Chapter 7. SDC Range: ~$8,000-$18,000 per ADU. Components: Wastewater, Stormwater, Parks, Transportation. Water SDC: Charged by EWEB. School CET: Per ORS 320.170-189.

Failure to pay assessed SDCs prevents issuance of a Certificate of Occupancy and may result in liens on the property under Eugene Code Chapter 7. Underreporting ADU size or construction value to reduce SDCs constitutes fraud and can void permits. Connection to city utilities without paying assessed connection fees is a separate violation.

ADU Rental Restrictions

Eugene ADUs may be rented for long-term use without owner-occupancy under Oregon HB 2001 and HB 3197. Short-term rentals (under 30 days) are regulated by Eugene Code Chapter 9 (Land Use Code) provisions on vacation rentals and require business registration. Statewide rent stabilization and just-cause eviction apply to long-term tenants.

Key details: Long-Term Rules: No owner occupancy required. STR Authority: Eugene Code Chapter 9. Lodging Tax: 1.5% state + Lane County + city. Rent Cap: 7% + CPI, max 10% (SB 611). Just Cause: ORS 90.427 after 12 months.

Operating an unregistered vacation rental may violate Eugene Code Chapter 9 land use standards and result in zoning enforcement. Failure to remit transient lodging taxes triggers Oregon Department of Revenue and Lane County collections. Long-term tenant evictions without just cause violate ORS 90.427 and create wrongful eviction liability. Habitability violations under ORS 90.320 are enforceable through state court.

Shed Rules

Eugene allows sheds and accessory structures. Small sheds under 200 sq ft and single-story are typically exempt from building permits. Zoning setbacks apply.

Key details: Permit Exempt: Under 200 sq ft, single-story. Setbacks: Must comply with land use code. Front Yard: Not permitted. Materials: Chain link/plastic prohibited citywide.

Sheds violating setbacks or size limits without permits may require relocation or removal.

The rules around shed rules in Eugene lean permissive, but that does not mean anything goes.

The Bottom Line

Compared to many U.S. cities, Eugene gives residents more room on accessory structures. 3 of the 8 rules here are rated permissive. But permissive does not mean unregulated. There are still requirements, and the city does enforce them when violations are reported.

Keep in mind that Eugene can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.