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Energy Code Compliance Calculator

New Washington State residential energy code calculator

The Washington State University (WSU) Energy Program has released a new, web-based Washington State residential energy code calculator. This calculator will help homeowners, builders, and building officials determine whether residential construction projects meet the requirements of the Washington State Energy Code—Residential (WSEC-R 2021).

The Washington State residential energy Code Compliance Calculator provides an efficient way to evaluate building envelope components, mechanical systems, and overall energy performance to ensure compliance with current state regulations.

Access the Code Compliance Calculator

Key features of the new tool

  • Calculates compliance for new residential construction
  • Evaluates building envelope requirements
  • Creates a single zone heating calculation
  • Generates a compliance report (other documentation will still be needed)
  • Saves and manages multiple projects

Code Compliance Calculator Video Tutorial

Access this video with audio descriptions. Video credit: WSU Energy Program

For questions or assistance, please contact us at ep.energycode@wsu.edu.

Excel-based code compliance calculator (C3)

The Excel-based C3 tool caters to the 2018 and 2021 WSEC-R code cycles. The tool requires Excel for Windows installed on a computer (not web-based) and is not available for Macs. The Excel version is available below.

Disclaimer

Results from the Washington State Residential Energy Code Calculator and the C3 tool assume that all data is entered correctly and completely. Results do not constitute an official decision. Your analysis should be reviewed by your building official/authority having jurisdiction. The tool is not all inclusive and an understanding of the WSEC-R code is necessary for compliance.