The following forms and documentation are provided by the WSU Energy Program to assist with building projects. The forms and documentation required by building departments will vary depending upon each permitted project.
Upcoming: Accessibility Improvements & New C3 Webtool
The WSU Energy Program is currently transitioning select Washington State Energy Code (WSEC-R) resources to meet updated accessibility requirements, ensuring improved usability for all users.
As part of this effort, we will soon release the C3 Webtool, a new, fully accessible platform designed to support compliance documentation and streamline code form completion.
During this transition period:
- Some existing forms and tools may be updated or replaced
- Users are encouraged to check back regularly for the latest versions
- Additional guidance and training materials will be provided with the C3 Webtool launch
We appreciate your patience as we enhance these resources. For questions or assistance, please contact us at ep.energycode@wsu.edu.
Overview of the Washington State Energy Code-Residential (WSEC-R) 2021 Edition Video
Code Compliance Calculator (C3)
C3 requires Excel for Windows installed on your computer (not web-based) and is not available for Macs.
The Code Compliance Calculator (C3) will help you document building designs for WSEC-R. It is especially useful for designs using the UA percent trade-off for Option 1 envelope measures (Section R402.3) and the Total UA Alternative (Section R402.1.4). C3 replaces the UA Alternative Worksheet (formerly referred to as the Component Performance worksheet) and integrates the glazing schedule, the heating system sizing worksheet, and a ventilation calculator. The ventilation calculation is to determine whole house mechanical ventilation airflow rate per IRC and IMC, and a maximum allowable duct leakage calculator per RS-33.
Disclaimer: Results from the C3 assumes 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.
- Code Compliance Calculator (C3)—Right click link, select Save Link As and save the C3 file to your computer
- C3 Information
- 2018 WSEC-R: Using the C3 Calculator (PPT)
Prescriptive Method – Individual Code Compliance Forms
Select the WSEC-R edition needed from below for the appropriate downloadable links containing the WSU-EP provided tools for the Washington State Energy Code – Residential Compliance Prescriptive Path. The prescriptive path is the typical compliance approach. To follow this approach, you will need to complete a prescriptive worksheet, glazing schedule, and heating system sizing calculator. You will also need the final inspections forms.
WSEC-R 2021 Code Edition Forms
Please contact us if you need access to the Single-Family Prescriptive Form or the Multi-Family Prescriptive Form for using the C3 calculator.
- WSEC-R Alterations & Remodels (PDF)
- Building Air Leakage Test Results (PDF)
- Compliance Certificate (PDF)
- Duct Leakage Affidavit (PDF)
- Insulation Certificate for Residential New Construction (PDF)
- Simple Heating System Sizing Calculator—Right click link, select Save Link As and save the file to your computer
- Heating System Sizing Instructions (PDF)
- Glazing Schedule—Right click link, select Save Link As and save the file to your computer
- Section R406 – R406.2 and R406.3
Helpful Supporting Documents
- 2021 WSEC-R Plan Submittal Checklist (PDF)
- AHRI Directory for HVAC Equipment
- HVI & Ventilation Efficiencies
- NEEA equipment list for water heaters
- NEEP list of cold climate heat pump units
- HVAC-ST, HVAC sizing tool
- 2021 BetterBuilt NW Code Cookbook
- Identifying Variable Speed Heat Pumps Quick Guide (PDF)
- My Building Permit, 2021 Garage Conversion Tip Sheet