Washington State Residential Energy Code Technical Code Support

Energy Code Forms and Documentation

Forms and documentation are provided by WSU Energy Program to assist with building projects. The forms and documentation required by building departments will vary depending upon each permitted project.

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) and Instructions

• Slide deck:
• 2018 WSEC-R: Using the C3 Calculator (PPT)
• Video trainings:
• Introduction to the C3 Calculator(9 min)
• Using the C3 Calculator: Small Addition with User-defined Baseline (16 min)
• Entering Custom Values in the Databases & Creating a "Glazing Schedule" (7 min)
• Using C3 to print PDF forms (9 min)
• Using the C3 Calculator to Calculate Ventilation Rates (10 min)
• Filling out the Compliance Certificate for Ventilation Systems (10 min)
• Upload files for assistance

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

• Form Instructions
• HSPF2 - 406.3
• WSEC-R Energy Credit Options
• 406.2 - 406.3 HVAC Flow Chart
• Single Family Prescriptive form - v4/9/2024 (right click to download)
• Multi-family Prescriptive form - v4/9/2024 (right click to download)
• WSEC-R Additions & Remodels
• Building Air Leakage Test Results
• Compliance Certificate
• Duct Leakage Affidavit
• Insulation Certificate for Residential New Construction
• Simple Heating System Sizing Calculator
• Heating System Sizing Instructions
• Glazing Schedule

WSEC-R 2018 Code Edition Forms

See the 2018 Energy Code page.

R405 Simulated Performance Alternative Path

• A preliminary review of background material indicates that EnergyPlus may meet the requirements. EnergyPlus and OpenStudio are free and open source, available for download at www.energyplus.net and http://openstudio.net/.
• Technical documentation and background is available at https://bigladdersoftware.com/projects/energyplus/ and https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=916076.
• The CEC funded development such that EnergyPlus can be used to model typical residential geometries, constructions, and HVAC systems, including ductwork in unconditioned spaces. (https://energyplus.net/node/96, https://escholarship.org/uc/item/0z78090x).
• Please contact us at energycode@energy.wsu.edu for additional inquires about software and who’s role does it fall under.

R407 Passive House Path

This new compliance path in the 2018 WSEC-R allows certified Passive House projects to achieve compliance with WSEC-R. There are requirements for documentation at plan review and final site inspection. See Passive House Northwest for more information.