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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:

Portland
ADU Program Guide
http://www.portlandonline.com/bds/index.cfm?c=36814&a=68689
Second Sink Agreement
http://www.portlandonline.com/bds/index.cfm?c=36815&a=174914


Washington County

Community Development Code. Special Use Standards 430, use bookmark feature to go to section 430-117
http://www.co.washington.or.us/LUT/Divisions/LongRangePlanning/Publications/cdc-community-development-code.cfm


Beaverton

Chapter 40 Applications  40.05.15

http://www.beavertonoregon.gov/documentcenter/view/4967
Development Application – ADU

http://www.beavertonoregon.gov/DocumentView.aspx?DID=1130


Tigard

Accessory Residential Units Chapter 18.710
http://www.tigard-or.gov/DevelopmentCode/18710_1.pdf


Clackamas County

Zoning and Development Ordinance Section 839
http://www.clackamas.us/planning/zdo.html

Lake Oswego
Article 50.30 Special Requirements for Type of Facility
http://www.ci.oswego.or.us/sites/default/files/fileattachments/planning/webpage/12606/accessory_structures_rev_4-16-10.pdf

Gresham
Supplementary Development Regulation Article 10.0100
https://greshamoregon.gov/WorkArea/linkit.aspx?LinkIdentifier=id&ItemID=16776&libID=16800

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