2025 Building Energy Efficiency Standards

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.

• 2025 Energy Code Reference Appendices

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.

• 2025 Energy Code Compliance Software

Alternative Calculation Method (ACM) Manuals
These manuals identify the modeling rules used within the compliance software.

• 2025 Single-Family ACM Reference Manual
• 2025 Nonresidential and Multifamily ACM Reference Manual

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.

• 2025 Data Registry Requirements Manual

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.

• 2025 Energy Code Photovoltaic and Battery Storage Cost-Effectiveness Determinations 25-BSTD-02
• 2025 Energy Code Compliance Software, Manuals and Forms 24-BSTD-03
• 2025 Energy Code Rulemaking Docket 24-BSTD-01
• 2025 Energy Code Pre-Rulemaking Docket 22-BSTD-01

• Notice of Availability
  • June 9, 2025 - Corrections to 2025 Energy Code Battery Energy Storage System Capacity Requirements
• Final Rulemaking Documents
  • Notice of Proposed Action
  • Initial Statement of Reasons
  • Final Statement of Reasons
  • Response to Comments
  • Updated Informative Digest
  • Nine Point Criteria
• Proposed 15-Day Regulatory Language (August 2024):
  • Building Energy Efficiency Standards 15-day language
  • Notice of 15-Day Public Comment Period
• Proposed 15-Day Regulatory Language (June 2024):
  • Building Energy Efficiency Standards 15-day language
  • Reference Appendices 15-day language
  • Notice of 15-Day Public Comment Period
  • Notice of Adoption Postponement
• Proposed 45-Day Regulatory Language:
  • Building Energy Efficiency Standards
  • Reference Appendices
• Initial Study and Proposed Negative Declaration
• Notice of Initial Study and Proposed Negative Declaration
• Notice of Intent to Adopt a Negative Declaration
   
• Supporting Documents
  • 2025 Energy Code Accounting Report

• Local Ordinances Exceeding the 2025 Energy Code