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Residential Structures Code Program


2021 Oregon Residential Specialty Code (ORSC)

The new 2021 ORSC, based on the 2018 International Residential Code (IRC), has been adopted. Chapter 1, Scope and Administration, of the 2021 ORSC becomes effective and mandatory on April 1, 2021. The remaining provisions of the 2021 ORSC become effective April 1, 2021, but do not become mandatory until after the six-month phase-in period ends on Sept. 30, 2021. During the phase-in period, use of the 2017 ORSC with the 2021 ORSC Chapter 1 or the 2021 ORSC in its entirety is permitted.

The published codebook and integrated read-only version will be available soon.

The Chapter 1 provisions and a summary of significant changes have been prepared for the 2021 ORSC. This summary is intended to help with the transition from the previous edition and does not include all changes adopted in the 2021 ORSC.

Access code update training and resources
Access information about the code adoption process

2021 Oregon Residential Reach Code Adoption

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.

2021 Oregon Residential Specialty Code (ORSC)
Effective April 1, 2021
Based on the 2018 International Residential Code

Summary of significant changes
Code update training and resources

Small Home Specialty Code

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

Previous residential code

2017 Oregon Residential Specialty Code (ORSC)
Effective Oct. 1, 2017, and based on the 2015 International Residential Code

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