Energy Efficiency Newsroom

Check this webpage regularly for regional and national news and information about building energy efficiency, energy code updates and development, and equipment efficiency standards.

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These new features include project specific WSEC provision checklists and online compliance documentation forms for envelope and lighting. The mechanical compliance documentation tool will be available in the fall of 2019.

Click on the My Projects page to explore this new compliance tool!

POSTED - August 1st, 2019


2018 WSEC Commercial - PUBLIC HEARING HELD JULY 12TH, 2019

The WSEC is the International Energy Conservation Code (also referred to as the model code) with WA State Amendments.

Last fall, the Energy Code Technical Advisory Committee (TAG) completed their review of all public code change proposals submitted for the commercial provisions of the 2018 WSEC and the TAG submitted their recommendations to the WA State Building Code Council (SBCC).

The SBCC have completed their modifications of the model code and the resulting commercial document is now available for public review.

The State Building Code Council has set July 12th, 2019 as the hearing date for all proposed code changes to the WSEC Commercial, IBC and IFC. This hearing will be held at the Dept of Environmental Services Building in Olympia. Time and agenda will be posted soon. Webex participation will be available.

Here's a link to the SBCC webpage where the latest version is available for download - 2018 WSEC Commercial 5/16/19 Version. This file and a form for submitting written comment is posted under "Permanent Rules.

If you would like to submit a written comment we recommend submitting as soon as possible to allow enough time for SBCC review.

The 2018 WSEC will go into effect mid-year 2020.

UPDATED - June 12, 2019


2015 WSEC Commercial - Permanent Rule changes effective July 1, 2019

The following permanent rule changes have been incorporated into the commercial 2015 WSEC. Refer to the following code sections in the Washington Administrative Code for the updated code language (see weblink on the WSEC Documents webpage). For replacement insert pages for these sections, visit the Washington State Building Code Council rulemaking website located here

Section C402.1.5 Component performance alternative

Clarifications and corrected language and section references in Equation 4-2 for the component performance UA trade-off calculation, including target area adjustment

Section C402.1.5.2 SHGC rate calculation

Clarifications and corrected language in Equation 4-3 for the component performance SHGC x A trade-off calculation for vertical fenestration and skylights. Clarifies that target area adjustment is allowed for SHGC x A.

Section C404.6 Insulation of piping

For service water heating systems, this amendment adds an exception clarifying that the final pipe run to a plumbing fixture is not required to be insulated provided the pipe run is not part of the heated-water circulation system.

C503.2 Change in space conditioning

Language amended to be consistent with amendments to C402.1.5 Component performance alternative.

C505.1 Change in occupancy or use

Language amended to be consistent with amendments to C402.1.5 Component performance alternative.

POSTED - July 7th, 2019


WSEC Commercial Technical Support - ETC

Evergreen Technology Consulting (ETC) is a new provider of commercial energy code technical support services for WA State. We provide classroom and online training, technical topic resources, on-line compliance documentation tools and on-call technical support. 

Refer to the Contact Us page to reach our commercial energy code experts.


WA State Department of Commerce - State Energy Office Newletters

Latest news from the State Energy Office

UPDATED - April 30, 2019