Building Energy Codes

Building Energy Code Resources:

Effective April 7, 2025, Maine’s Uniform Building and Energy Code’s baseline energy code is the 2021 Edition of the International Energy Conservations Code (IECC).

Current Building Energy Codes in Maine:

The Maine Uniform Building and Energy Code (MUBEC) is made up of the following codes and standards:

• 2021 International Energy Conservation Code. 
• The following American Society of Heating, Refrigeration and Air-Conditioning Engineers (ASHRAE) standards are also adopted as part of MUBEC:
  • 2019 ASHRAE 62.1 (Ventilation for Acceptable Indoor Air Quality)
  • 2019 ASHRAE 62.2 (Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings)
  • OR the CSA-F326-M91 Canadian Standards Association Standard for Residential Mechanical Ventilation Systems (Alternative to ASHRAE 62.2)
  • 2019 ASHRAE 90.1 (Energy Standard for Buildings except Low-Rise Residential Buildings) editions without addenda.

Resources

• State of Maine Office of the State Fire Marshal, Bureau of Building Codes and Standards: The Bureau of Building Codes and Standards provides administrative and technical support to the Technical Building Codes and Standards Board and non-binding technical interpretation of the codes for professionals and the public.
• International Code Council (ICC): The International Code Council is the source of the model codes and standards above.
• REScheck™: The REScheck software and web tools support residential energy code compliance. From the U.S. Department of Energy’s Building Codes Program.
• COMcheck™: The COMcheck software and web tools simplify and clarify energy code compliance with the IECC, standard (ASHRAE Standard 90.1. From the U.S. Department of Energy’s Building Codes Program.