Eugene is highly ADU-friendly with streamlined by-right approval for detached units. The city encourages ADU development as part of its infill housing strategy, offering reasonable size limits and minimal parking requirements.
Zoning & Size Requirements
| Allowed Zones | All residential zones |
| Max Size (Detached) | 1,100 sq ft |
| Max Size (Attached) | 900 sq ft |
| Max Size (JADU) | 750 sq ft |
| Max Height | 35 feet |
| Max Units | 1 main ADU + 1 JADU per lot |
Setback Requirements
| Rear Setback | 10 feet |
| Side Setback | 0 feet (easement) |
| Front Setback | 0 feet (alley) |
| Parking Required | Optional |
| Owner Occupancy | Not required |
| Min Lot Size | 4,000 sq ft |
Permit Process & Fees
| Approval Process | By-right approval |
| Review Timeline | 35-50 days |
| Permit Fees | $1,600-$2,700 |
| Impact Fees | Minimal |
| Plan Check | 1-2 weeks |
| Pre-Approved Plans | Available |
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Construction Costs
| Average Build Cost | $140,000-$280,000 |
| Cost per Sq Ft | $130-$260 |
| Garage Conversion | $65,000-$155,000 |
| Prefab ADU (Installed) | $95,000-$220,000 (installed) |
Finance Your ADU Project
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders in minutes.
Compare ADU Financing Options →Rental Income Potential
| Avg Rent (1 Bedroom) | $1,200-$1,700/mo |
| Avg Rent (2 Bedroom) | $1,600-$2,400/mo |
| Short-Term Rental | Yes, permitted |
| Est. Annual ROI | 7-10% annual return |
Explore Prefab ADU Options
Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half. Compare top prefab manufacturers.
Compare Prefab ADUs →Recent Law Changes
What's Changed Recently
- 2024: Expanded JADU allowance citywide
- 2023: Reduced parking requirements to zero for ADUs
- 2024: Increased max detached ADU size from 1,000 to 1,100 sq ft
- 2023: Streamlined approval timeline for pre-approved plans
Tips for Building an ADU in Eugene
- Eugene actively promotes ADUs; excellent city support for projects
- College town market (University of Oregon) ensures strong rental demand
- Short-term rental allowed; additional income potential
- Smaller lot minimum (4,000 sq ft) makes ADUs accessible on many properties
Frequently Asked Questions
Can I build an ADU in Eugene?
Yes. ADUs are allowed in All residential zones in Eugene. The maximum size for a detached ADU is 1,100 sq ft. No owner-occupancy is required.
How much does an ADU cost in Eugene?
ADU construction in Eugene typically costs $140,000-$280,000. Garage conversions run $65,000-$155,000, and prefab ADUs cost $95,000-$220,000 (installed).
How much can I rent an ADU for in Eugene?
Average ADU rents in Eugene are $1,200-$1,700/mo for a 1-bedroom and $1,600-$2,400/mo for a 2-bedroom unit.
Do I need parking for an ADU in Eugene?
Optional. Check with Eugene planning department for the latest Oregon ADU parking rules, as many states have relaxed requirements in recent years.
How long does it take to get an ADU permit in Eugene?
The permit review timeline in Eugene is 35-50 days. Fees range from $1,600-$2,700.
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