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Residential Structures Code Program

Adopted codes and standards

The division works with building officials, technical committees, advisory boards, and the public to adopt, amend, and interpret the Oregon Residential Specialty Code (ORSC). This code applies to the construction, reconstruction, and repair of one- and two-family dwellings and townhouses.

2023 Oregon Residential Specialty Code (ORSC)

Code update training and adoption resources

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Program activities

  • Residential and Manufactured Structures Board - The Residential and Manufactured Structures Board works with the division to adopt and administer the ORSC.
  • Residential code adoption - The division works with the board, local building officials and industry stakeholders to adopt each edition of the ORSC. The code adoption process includes a code development phase, a board review phase which can include a code review committee, a rulemaking phase and for certified inspectors, a code update training phase.
  • Permit-ready plans - The division has developed new permit-ready deck plans meeting the requirements of the ORSC.
  • Low-volume window labels - The Low-Volume Window Label Program helps manufacturers and installers comply with the Oregon Residential Specialty Code (ORSC) fenestration provisions for windows and glazed doors, as well as certain kinds of skylights and solariums, produced in small numbers.

Small Home Specialty Code

Current Small Home Construction Standards and Planned 2026 Updates

The statutory provisions that govern construction standards for small homes and exclusion of small homes from the prefabricated structures program are set to sunset in 2026. At that time, barring additional statutory changes, small homes will be included in the state prefabricated structures program, and the Building Codes Division intends to adopt code changes that account for the safety risk associated with sleeping lofts and ladders, regardless of home size, in partnership with the Residential and Manufactured Structures Board.

Read more about these updates

The Small Home Specialty Code, established by ORS 455, requires that the 2018 International Residential Code, including but not limited to Appendix Q, be used for the design and construction of small homes. Statute defines a "small home" as a single-family residence that is not more than 400 square feet in size.

For more information about small home construction standards see ORS 455, including 455.616.

For more information on building permit requirements, please contact your local building department .

Small home resources