Accessory Dwellings

A one-stop source about accessory dwelling units, multigenerational homes, laneway houses, ADUs, granny flats, in-law units…

City of Portland ADU Permit Trends

ADUs by year bar chart2

The City of Portland continues to grow its ADU housing stock.  In 2013, there were almost 200 ADU permit applications received, which is about 25% of all single-dwelling permits in Portland.  In total, there are approximately 800 completed and permitted ADUs in Portland.   The chart shows the dramatic impact of the 2010 waiver of System Development Charges (SDCs), which reduces the cost of building an ADU by $8,000-11,000. 

In 2010, the ADU zoning code was also changed to allow ADUs to be built up to 75% the size of the main house, or 800 sqft feet – whichever is smaller.  The old size limit was 33% the size of the main unit, which was considerably more restrictive.  We anticipate that the increased interest in ADUs will continue since the SDC waiver was recently extended until July 2016, and knowledge about ADUs grows among Portland residents.

5 comments on “City of Portland ADU Permit Trends

  1. Pingback: Why ADUs are hard to study, and confuse nearly everyone | Accessory Dwellings

  2. Pingback: What are the barriers to ADU development? | Accessory Dwellings

  3. Pingback: Thoughts on Minneapolis’ Proposed ADU Ordinance |

  4. Pingback: Why Vancouver Trounces the Rest of Cascadia in Building ADUs | Sightline Institute

  5. Pingback: Jump Starting the Benefits of ADUs in Minneapolis |

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s


This entry was posted on March 12, 2014 by in News, Policy & Trends and tagged , , , , , , , .

%d bloggers like this: