ADU (Accessory Dwelling Unit) Permit in Eugene (2026)
ADU (Accessory Dwelling Unit) permit requirements, fees, and process for Eugene, OR. Find out if you need a permit and how to apply.
Yes, a ADU (Accessory Dwelling Unit) permit is required in Eugene, OR.
A ADU (Accessory Dwelling Unit) permit is required in Eugene, OR. The Eugene Planning and Development Department — Building Division handles permit applications for Eugene. Below you will find the current thresholds, fees, and process for obtaining a adu (accessory dwelling unit) permit in Eugene.
When Is a Permit Required?
When a ADU (Accessory Dwelling Unit) Permit Is Required in Eugene: All ADUs
Permit Fees
ADU (Accessory Dwelling Unit) Permit Fees in Eugene: $2,000–$7,000 plus SDCs. Estimated timeline: 4-8 weeks.
Estimated timeline: 4-8 weeks
How to Get a ADU (Accessory Dwelling Unit) Permit in Eugene
Verify whether your project meets the permit threshold in Eugene: All ADUs.
Prepare your permit application and plans. Contact the Eugene Planning and Development Department — Building Division at https://www.eugene-or.gov/planning/building for required documentation.
Submit your application online at https://www.eugene-or.gov/permits or in person at the Eugene Planning and Development Department — Building Division.
Pay the permit fee: $2,000–$7,000 plus SDCs.
Wait for plan check approval. Estimated timeline: 4-8 weeks.
Schedule required inspections through https://www.eugene-or.gov/planning/building/inspections. All inspections must pass before project is finalized.
Important: Eugene Building permit. SDCs for water, sewer, transportation, parks add $5,000–$15,000. UO proximity creates strong ADU rental demand — studio ADUs near campus rent for $1,200–$1,800/month. Existing older homes often have large detached garages suitable for ADU conversion.
Eugene Planning and Development Department — Building Division
Phone: (541) 682-5673
Website: https://www.eugene-or.gov/planning/building
Online Permits: https://www.eugene-or.gov/permits
Hours: Mon-Fri 8:00am-5:00pm (99 W. 10th Ave)
Frequently Asked Questions
Can I build an ADU near the University of Oregon campus in Eugene?
Yes. Oregon HB 2001 requires Eugene to allow ADUs by-right in all residential zones. The University Impact Area (UIA) near UO campus allows higher-density housing. ADUs in the UIA and adjacent R-2/R-3 zones are particularly attractive — graduate student and faculty housing demand drives strong rental rates ($1,200–$1,800/month for studios). Eugene Code Section 9.2340 governs ADU standards citywide. Apply through Eugene Planning at (541) 682-5673.
Does Eugene Water & Electric Board (EWEB) offer benefits for solar and ADU development?
Yes. EWEB is Eugene's community-owned public utility providing both water and electricity. EWEB's Solar Credit Tariff provides net metering for rooftop solar. EWEB offers rebates for heat pump water heaters and space heating conversions from gas — relevant for all-electric ADU construction. EWEB provides electric vehicle charging rebates. Since EWEB is community-owned, it's highly responsive to community input compared to investor-owned utilities. Contact EWEB's Home Energy Services team at (541) 685-7000.
What are Eugene's short-term rental rules for Airbnb near UO?
Eugene requires STR registration ($125/year) for rentals under 30 days. Eugene's STR rules include a primary residence requirement (you must have lived there 6+ months) and a 90-night annual cap on unhosted whole-home rentals. University neighborhood STRs face some additional scrutiny given student housing scarcity — Eugene monitors STR compliance near campus. The UO academic calendar creates strong STR demand during graduation weekends, football game days, and conference seasons. Register your property before listing.
How does Eugene's rainfall affect ADU construction and maintenance?
Eugene receives approximately 49 inches of rainfall annually (compared to Portland's 43 inches and Seattle's 38 inches) — one of the rainier major Oregon cities. For ADU construction: use moisture-resistant building materials (fiber cement siding, not wood lap), vapor barriers in floors and walls, drainage mat systems behind siding in rain-screen installation, and quality waterproofing at foundation level. Metal roofing is popular for longevity in Eugene's wet climate. Ensure proper grade drainage away from ADU foundation. Budget for annual gutter cleaning given leaf fall from Eugene's mature tree canopy.
Are there flood zones in Eugene I should know about before building an ADU?
Yes. Eugene has significant flood risk areas near the Willamette River, Amazon Creek, and their tributaries. Use FEMA's Flood Map Service Center (msc.fema.gov) to check your specific parcel. The Willamette River 100-year floodplain affects portions of west Eugene and areas south of Valley River Center. Amazon Creek watershed covers much of central Eugene. Properties in FEMA SFHA require flood insurance with federally-backed mortgages. Contact Eugene Planning at (541) 682-5481 to determine if your property has floodplain development restrictions before designing your ADU.
How does Eugene's ADU market compare to Bend's?
Eugene and Bend both follow Oregon HB 2001 statewide standards with 800 sqft maximum ADU size and no owner-occupancy requirement. Key differences: Eugene's ADU rental market is driven by University of Oregon (22,000 students), creating strong demand for smaller studios and 1-bedrooms year-round. Bend's market is driven by outdoor recreation migration and tech workers, with premium for larger 1-2 bedroom ADUs near recreation amenities. Eugene's System Development Charges (SDCs) are comparable to Bend's. Eugene's EWEB utility provides both water and electricity (Bend uses Pacific Power for electric, Bend Municipal for water). Eugene's climate is milder (fewer hard freezes) than Bend but wetter.
Source: Eugene Building Code — ADU (Accessory Dwelling Unit) Requirements. Last verified April 6, 2026. View source