OPEN SOURCE
CBECC-Res compliance software is an open source project. All program (C/C++) source code is now hosted as open source on these two GitHub repositories:
The open source software available on these repositories can be compiled to produce products that are functionally equivalent to the CBECC-Res compliance program. However, this open source software cannot be used for code compliance in California.
Residential building permits must be submitted using compliance software that is certified by the California Energy Commission and available from this website and from third-party vendors. For a list of approved compliance programs, visit the Energy Commission's Title 24 Online Resource Center.
For security reasons, the CBECC-Res analysis ruleset files used by the open source and certified versions are incompatible with each other.