Are ADUs legal in Oregon?
Yes — Oregon permits ADUs by-right statewide per HB 2001 (2019), SB 458 (2021). Every qualifying municipality must allow at least one ADU pathway on eligible single-family lots.
What are the size limits on an ADU in Oregon?
Oregon permits ADUs up to approximately 900 square feet per HB 2001 (2019), SB 458 (2021). Individual municipalities may set lower caps; verify with your city or county planning department before ordering.
Do I need a permit for an ADU in Oregon?
Yes — every ADU in Oregon requires a building permit issued by the city or county. The permit process typically runs 45-110 days depending on jurisdiction, complexity, and whether discretionary review is triggered.
Can I rent out my ADU in Oregon?
Yes — long-term rental of an ADU is generally permitted in Oregon. Short-term rental (Airbnb / VRBO under 30 days) is subject to municipal registration and may require additional permits.
Does Oregon require owner-occupancy on the primary residence when I have an ADU?
No — Oregon does not require owner-occupancy under state statute per HB 2001 (2019), SB 458 (2021). Local ordinances may still add owner-occupancy requirements in specific cities.
What zoning districts allow ADUs in Oregon?
Most Oregon municipalities permit ADUs in single-family residential zones (R-1, R-2 equivalent). Oregon HB 2001 (2019) permitted duplexes on all single-family lots statewide and required cities over 10,000 to allow ADUs by-right. SB 458 (2021) extended tenancy protections. Consult your city zoning code for the specific district table.
How long does an ADU permit take in Oregon?
Typical ADU permit timelines in Oregon run 45-110 days from application to approval. Fast-permitting counties can move in under 30 days; metro-core jurisdictions with discretionary review can extend to 150+ days.
Are there setback requirements for an ADU in Oregon?
Yes — most Oregon municipalities apply the same setback requirements to ADUs that apply to the primary structure (typically 5-10 feet rear and side, 15-25 feet front). Some cities apply reduced setbacks specifically for detached ADUs. Verify with your city zoning code.
Can I finance an ADU purchase in Oregon?
Yes — several financing pathways cover ADU purchases in Oregon: Fannie Mae HomeStyle Renovation, FHA 203(k), construction-to-perm loans, HELOC on the primary residence, and cash. Check with modular-friendly lenders like 21st Mortgage, Cascade Financial, and Triad Financial for the Oregon-specific product.
What's the difference between an ADU and a JADU in Oregon?
The JADU (Junior ADU) category originated in California and is not a distinct legal category in Oregon. Most Oregon municipalities regulate internal conversions and detached units under a single ADU/accessory apartment definition.