2025 Energy Code Compliance Software, Research Versions

The following software is provided by the California Energy Commission (CEC) for public review and testing. This software is not valid for compliance, is for research only, and subject to change. There is currently no approved 2025 compliance software.

Single-Family Residential, 2025 Energy Code

Program NameResearch Versions AvailableContact InformationAdditional
Information
California’s Building Energy Code Compliance Software – Residential (CBECC-Res)

CBECC-Res 2025.0.9b RV contains the 2025 long-term system cost, hourly source energy factors, and weather data updates. Additionally, version 2025.0.9b RV contains a new peak cooling energy calculation used for demonstrating compliance via the performance approach. A description of this peak cooling energy calculation has been docketed. 

This research version is based on CBECC-Res 2022 and contains the 2022 standard designs and rulesets except where noted above.

Latest Research Version

California Energy Commission 
Building Standards Office 
715 P Street, MS 37 
Sacramento, CA 95814 
ATTN:  Thao Chau
916-776-7974
cbecc.res@energy.ca.gov 

See the CBECC-Res Website for: 

  • Quick Start Guide and User Manual (packaged with software)
  • FAQs
  • Software Archive 
  • ACM Tests 
  • Reference Documents 

Support: cbecc.res@energy.ca.gov 

Nonresidential and Multifamily, 2025 Energy Code

Program Name Compliance Software Versions Contact Information Additional
Information
California’s Building Energy Code Compliance Software (CBECC) 

CBECC 2025.0.4 RV contains the 2025 long-term systemwide cost and hourly source energy factors, and 2025 weather data
 
This research version is based on CBECC 2022.2.1 and contains the 2022 standard designs and ruleset.

Additional CBECC 2025 building prototypes are available on the CBECC project website.
 
Latest Version

 California Energy Commission 
Building Standards Office 
715 P Street, MS 37 
Sacramento, CA 95814 
ATTN: RJ Wichert 
916-897-3450 
cbecc@energy.ca.gov 

See the CBECC Website for: 

  • SketchUp and OpenStudio SketchUp Plugin 
  • Prototype Models & Tutorials 
  • FAQ/Training 
  • Software Archive 
  • Quick Start Guide 
  • User Manual

Support: cbecc.com@energy.ca.gov

Help With the Energy Code

For assistance with understanding or locating information in the Energy Code, contact the Energy Standards Hotline at: 800-772-3300 (toll-free in California); 916-654-5106 (outside California); or via email at title24@energy.ca.gov.