County officials hope the zoning changes will help boost the housing supply in the region.

Clackamas County, Oregon residents will be allowed to include accessory dwelling units (ADUs) and recreational vehicles (RVs) as secondary housing units on properties in Rural Residential zones.
According to an article in Mountain Times by Adrian Knowler, “ADUs are defined as permanent dwellings that include a kitchen, bathroom, and are permitted and connected to utilities, principal planner Martha Fritzie told the commissioners. She noted that ADUs can be either detached buildings, internal conversions or extensions of existing houses.”
The new rules apply to properties larger than two acres. ADUs must be no larger than 900 square feet, while RVs must be equipped with permanent essential services like water and sewage disposal. The rules also prohibit renting these units as short-term rentals.
As Knowler notes, “The proposal came as state laws on land use have changed over the previous three legislative sessions. State law previously had prohibited ADUs outside urban growth boundaries such as the rurally designated Mount Hood Corridor.”
FULL STORY: New (Clackamas) County Rules Allow Auxiliary Dwelling Units, RVs as Second Dwellings

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City of Albany
UCLA Lewis Center for Regional Policy Studies
Mpact (formerly Rail~Volution)
Chaddick Institute at DePaul University
City of Piedmont, CA
Great Falls Development Authority, Inc.
HUDs Office of Policy Development and Research