Oregon updates building code to allow ‘stacked duplexes,’ boost housing density

The Oregon Building Codes Division has adopted provisions allowing for a new type of housing — stacked duplexes — in an effort to increase residential density.

The new code defines stacked duplexes as “a vertically stacked, two-family dwelling where one of the dwelling units is located above the other dwelling unit and access to a yard, street, alley or public way is provided on not less than two sides.”

Temporary rules implementing the change took effect Jan. 31 with permanent adoption set for April 1.

These code updates allow stacked duplexes to utilize existing code provisions for townhouses, doubling dwelling units in areas looking to densify. This will also allow for more development on smaller lots needing housing infill while maintaining safety and unit compartmentalization.

Gov. Tina Kotek said this code update is an innovative way to improve access to affordable housing.

“Addressing the housing affordability crisis means looking under the hood for every fix we can find,” Kotek said. “I appreciate the Oregon Building Codes Division’s creative work. This change will give more Oregon families access to more affordable options.”

Previously, stacked duplexes were more costly with more complex code application processes because this housing type was only allowed under the application of the structural specialty code’s multifamily path, according to a press release from the Oregon Department of Consumer and Business Services.

Alana Cox, administrator of the Building Codes Division, said this adoption provides the construction industry with another tool to help meet the state’s housing needs.

“It will allow for creating more units in a simpler, more streamlined way while still ensuring safeguards are afforded in design,” Cox said. “The governor has called for an all-hands-on-deck approach and we have been working with the Residential and Manufactured Structures Board, industry partners and local governments to come up with innovative solutions.”

Planners for the City of Eugene are working on Urban Growth Strategies to plan for needs related to jobs, housing and community growth through 2049. Eugene has made efforts to allow more middle housing construction like duplexes, townhomes and cottage clusters in recent years. With the updated code, stacked duplexes could add to the city’s infill housing options.

Hannarose McGuinness is The Register-Guard’s growth and development reporter. You can reach her at hmcguinness@registerguard.com.

This article originally appeared on Register-Guard: Oregon building code updated to include ‘stacked duplexes,’ up density

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