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The City of Portland, Oregon

Development Services

From Concept to Construction

Phone: 503-823-7300


1900 SW 4th Ave, Portland, OR 97201

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System Development Charges for Accessory Dwelling Units Temporarily Suspended

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This is an update to confirm a resolution was passed by City Council in November 2012 that extended the waiver of System Development Charges (SDC) for new ADU's. The resolution directed all affected bureaus to extend the current temporary suspension of System Development Charges (SDC) for new ADUs or the conversion of structures to ADU units until July 13, 2016. The goal of this action is to create incentives for the development of ADUs.

ADUThe affected bureaus are Water, Parks and Recreation, Environmental Services and Transportation. Please note that the Bureau of Development Services is responsible for the development review process, but does not assess SDC fees. All other non-SDC development related fees are due at time of permit issuance. Questions about SDC’s should be directed to the individual Bureaus (Water, Parks and Recreation, Environmental Services, and Transportation).

Accessory Dwelling Units (ADU) are defined by the Portland Zoning code as a second dwelling unit created on a lot with a house, attached house or manufactured home. The second unit is created auxiliary to, and is smaller than, the house, attached house (rowhouse) or manufactured house.

Proposals to build detached ADUs are reviewed through the New Single Family Review process. View the application package and process.

Permits to convert existing living space to an accessory dwelling unit are applied for in the Development Services Center (DSC), about the Minimum Submittal Requirements for an ADU:

The Bureau of Development Services has a Program Guide available that explains what constitutes an Accessory Dwelling Unit and how to permit one on your property

Review a general summary of System Development Charge information. Please note that SDC fees are typically revised every July 1.

If you have questions or concerns, please contact Kareen Perkins, Permitting Services and Resource Records Manager, at (503) 823-3622.