
2025 Energy Code for Residential and Nonresidential Buildings
Reference Appendices
2025 Energy Code: Reference Appendices are adopted along with the Energy Code and contain data and other information that helps builders comply with the standards. The Reference Appendices include sections on weather data, performance of assemblies with insulation, and residential and nonresidential tests and procedures.
Compliance Manuals
These documents, a part of the energy conservation manual, are designed to help the building industry comply with and regulators enforce the 2025 Energy Code for residential, nonresidential, and multifamily buildings. They are written as a reference and an instructional guide and can be helpful for anyone that is directly or indirectly involved in design and construction.
- 2025 Single-Family Residential Compliance Manual
- 2025 Multifamily Compliance Manual
- 2025 Nonresidential Compliance Manual
Impact Analysis
- 2025 Energy Code Impact Analysis (This document will be ready ~June 2026)
Compliance Software
CEC approved software to demonstrate performance compliance with residential and nonresidential provisions of the 2025 Energy Code. Performance modeling allows a user to assess building system performance or different building components against the Energy Code baseline.
Alternative Calculation Method (ACM) Manuals
These manuals identify the modeling rules used within the compliance software.
Data Registry Requirements Manual
This manual is intended to aid in designing and implementing software procedures and user interface features. As a resource for data registry providers, it includes information and explanations regarding the functional and technical aspects of the requirements given in Reference Joint Appendix JA7.
Compliance Documents - Forms
- Available ~ August 1, 2025
- Acceptance Test Technician Certification Provider Program - ATTCP
The program ensures that lighting control and mechanical contractors comply with the Energy Code in nonresidential buildings. - Energy Code Compliance Program - ECC
The program addresses construction defects and poor equipment installation, including HVAC systems and insulation, by evaluating homes.
- Notice of Availability
- Final Rulemaking Documents
- Proposed 15-Day Regulatory Language (August 2024):
- Proposed 15-Day Regulatory Language (June 2024):
- Proposed 45-Day Regulatory Language:
- Initial Study and Proposed Negative Declaration
- Notice of Initial Study and Proposed Negative Declaration
- Notice of Intent to Adopt a Negative Declaration
- Supporting Documents
- Local Ordinances Exceeding the 2025 Energy Code