Do you want to keep mom close, but not too close? Investigate the benefits and possible cost savings of adding a "ADU" Accessory Dwelling Unit to a existing lot, or on a new, larger lot.

Everyone loves mom and dad, but we all deserve some personal space...."breathing room", if you will. As we all age though, that option becomes less and less, as the natural process of aging combined with the requirement for single-level living, assistance and monitoring becomes a requirement.

You will find information on this page about adding an accessory dwelling unit to a property, or converting a structure to a duplex. Every dwelling unit functions as a separate unit. They are commonly known as "mother-in-law apartments", "granny-flats" or studio apartments.

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Getting Started

An accessory dwelling unit (ADU) is 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 main dwelling. ADUs can be created in a variety of ways, including conversion of a portion of an existing house, addition to an existing house, conversion of an existing garage or the construction of an entirely new building.

Methods to create an ADU

• Chapter 33.205 of the City of Portland Zoning Code provides the standards for accessory dwelling units in all Residential (R) zones. ADUs can be created in a house (detached single family dwelling), an attached house (rowhouse) or a manufactured home any of the following ways:
  
  a. Converting existing living area
  b. Finishing an existing basement or attic
  c. Building a new structure
  d. Making an addition to an existing structure
  
  Where attached housing was created under the infill provisions of the ‘a’ overlay zone (section 33.405.060), or as duplexes and attached houses on corners (section 33.110.240 E), ADUs are prohibited. Attics and basements with limited ceiling heights may not qualify as space that can be converted.
• Some existing attached or detached garages can be converted into an ADU in all R zones. ADUs can also be created by construction of a new accessory structure.

Applying For My Permit
Plan Review Process
Inspections
Applications & Handouts

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