Clackamas County ADU Permits

This guide quickly outlines a summary of key zoning and construction standards for ADUs in Clackamas County. For an in-depth review of the application and review procedures for installing an ADU, see the pdf below.

  • One attached or detached ADU for residential properties in the Urban Growth Boundary

  • No architectural consistency requirements. 

  • SDC fees charged, $6,200+ 

  • Size- 900 sq. ft maximum in most zones

At Dweller, we are responsible for all of these tasks, including design, permitting, construction and installation of the ADU. As part of this model, Dweller’s fixed cost covers not only the cost of construction and installation, but also the cost of permitting, utility connections and landscaping.

Click here to learn more about Clackamas County, OR Permitting Code for Accessory Dwelling Units (ADUs).