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We've researched the building and zoning requirements of constructing ADU's in Portland and many of the surrounding communities.  We offer the following resources with links so that you can become better educated about building an ADU and therefore understand and enjoy the ADU planning and building process more fully:

ADU Program Guide
Second Sink Agreement

Washington County

Community Development Code. Special Use Standards 430, use bookmark feature to go to section 430-117


Chapter 40 Applications  40.05.15
Development Application – ADU


Accessory Residential Units Chapter 18.710

Clackamas County

Zoning and Development Ordinance Section 839

Lake Oswego
Article 50.30 Special Requirements for Type of Facility

Supplementary Development Regulation Article 10.0100

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