Building Energy Code (Washington)

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Last modified on February 12, 2015.

Rules Regulations Policies Program

Place Washington

Name Building Energy Code
Incentive Type Building Energy Code
Applicable Sector Commercial, Residential
Eligible Technologies Comprehensive Measures/Whole Building
Active Incentive Yes

Implementing Sector State/Territory
Energy Category Energy Efficiency Incentive Programs

Code Change Cycle Three-year code review/change cycle. Most recent update effective: January 1, 2011.
Commercial Code 2009 WSEC, state-developed and implemented code more stringent than the 2009 IECC. Mandatory statewide.

Residential Code 2009 WSEC, state-developed and implemented code more stringent than the 2009 IECC. Mandatory statewide.

Date added to DSIRE 2006-07-27
Last DSIRE Review 2012-10-08

References DSIRE[1]


Much of the information presented in this summary is drawn from the U.S. Department of Energy’s (DOE) Building Energy Codes Program and the Building Codes Assistance Project (BCAP). For more detailed information about building energy codes, visit the DOE and BCAP websites.

The State Building Code Council revised the Washington State Energy Code in 2010.  The 2009 Washington State Energy Code (WSEC) was adopted in October of 2010 and made effective January 1, 2011. The WESC is a state-developed code which does not reference any model codes.

Changes to the state energy code are submitted to the State Building Code Council (SBCC) on standardized forms. Code changes must be received by March 1 of each year. The SBCC sends the change to a Technical Advisory Group (TAG) for review. The TAG members have varying expertise in the construction industry related to the proposed change. After completing the review, the TAG submits its recommendations back to the SBCC. The SBCC then determines which proposals will be sent forward into rulemaking for public hearing. The final decision is made by the Council prior to December 1 each year, but approved changes only go into effect when the new editions of model codes are adopted every three years. Legislative oversight is provided through two senators and two representatives serving as ex-officio non-voting council members and a legislative session must pass before the changes go into effect.

Changes are instituted on a three-year cycle corresponding with the International Code Council (ICC) International Building Code cycle. Once final approval is granted by the SBCC, the rule is filed with the Washington State Code Reviser and then published in the Washington State Register.

Incentive Contact

Contact Name Krista Braaksma
Department Washington State Department of Commerce
Division State Building Code Council
Address 128 10th Ave. SW
Address 2 PO Box 4525
Place Olympia, Washington
Zip/Postal Code 98504-2525
Phone (360) 725-2964


  • Incentive and policy data are reviewed and approved by the N.C. Solar Center's DSIRE project staff.[1]


  1. 1.0 1.1  "Database of State Incentives for Renewables and Efficiency (DSIRE)"