Portland is widely recognized as one of the most ADU-friendly cities in the United States. Progressive regulations, financial incentives, and a strong rental market make it an ideal environment for homeowners looking to add an accessory dwelling unit to their property.
Where Can You Build an ADU in Portland?
ADUs are permitted in most residential and mixed-use zones throughout Portland. This includes single-family residential zones (R5, R7, R10, R20), multi-dwelling zones, and commercial/mixed-use zones where residential use is allowed.
Size Limits
Parking & Owner Occupancy
Two of the biggest former barriers to ADU construction have been removed in Portland:
- No parking required: Off-street parking is not required for ADUs
- No owner-occupancy requirement: The property owner does not need to live in either the primary home or the ADU
The SDC Waiver Program: Save $36,000+
Portland's most significant financial incentive is the System Development Charge (SDC) Waiver Program. SDCs are fees on new construction that cover the impact on public infrastructure (parks, water, transportation).
How the SDC Waiver Works:
1. Sign a 10-year covenant with the City of Portland
2. Agree that neither the ADU nor the primary residence will be used as a short-term rental
3. SDC fees (potentially $36,000+) are waived entirely
Permitting Process
The permitting process in Portland typically takes 4-12 weeks depending on project complexity. Building permit fees for ADUs average $6,000-$10,000. Our team handles the entire permitting process, ensuring accurate applications and faster approvals.
Vancouver, WA: Key Differences
If you're on the Washington side of the metro area, Vancouver offers some advantages:
Need Help Navigating ADU Regulations?
Our specialists know Portland & Vancouver ADU codes inside and out. Get expert guidance for your project.