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Development Services

From Concept to Construction

Phone: 503-823-7300


1900 SW 4th Ave, Portland, OR 97201

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Waiver of System Development Charges (SDC) for Accessory Dwelling Units (ADU) Extended until July 2018

On April 13, 2016 City Council unanimously passed a Resolution extending the current waiver of System Development Charges for Accessory Dwelling Units. The Resolution directed all affected Bureaus to extend the current waiver of SDCs for new ADUs or the conversion of structures to ADU units until July 31, 2018, provided that the ADU is constructed and receives final inspection and certificate of occupancy by June 30, 2019.  This extension is to encourage homeowners and contractors to continue the building of ADUs which are integral to the achievement of the City’s affordable housing and housing density goals.

Accessory Dwelling Unit (ADU)The 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 for ADU development are due prior to permit issuance. Questions about SDC’s should be directed to the individual Bureaus. For general information about and contacts for SDCs, please see our Summary of System Development Charge brochure.

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.

For information and requirements to build a new detached ADUs, or to construct an ADU as part of a new Single Family Residential Project, please see our Applying for a New Single Family Residential Project brochure. For information and requirements to convert existing living space in a single-family home to an ADU, please see our Adding a Dwelling Unit brochure

For more information on what constitutes an Accessory Dwelling Unit and how to permit one on your property, please see our Program Guide on ADUs.