Massachusetts has three levels of building energy codes, each designed to improve energy efficiency across residential and commercial buildings. Below, we break down the different codes and provide links to the latest documents for reference.
The Massachusetts building energy codes are based on the International Energy Conservation Code (IECC) 2021 with state-specific amendments. There are three levels:
The Base Code is the default energy code applied across Massachusetts. It follows:
The 780 CMR 10th Edition is the official building code currently enforced in Massachusetts.
Municipalities can adopt the Stretch Code, which goes beyond the Base Code for better energy efficiency. It includes:
For even stricter energy standards, some municipalities may adopt the Specialized Code, which includes additional energy performance requirements:
Different municipalities across Massachusetts may follow different energy codes based on their energy efficiency goals. The map below provides an overview of which level of code is adopted by each municipality.
As of February 14, 2025, the most up-to-date energy code documents are:
Understanding the Massachusetts building energy codes is crucial for architects, builders, and homeowners looking to ensure compliance and improve energy efficiency. With the Base, Stretch, and Specialized Codes in place, municipalities can choose the level of efficiency that best aligns with their sustainability goals.
At Home Energy Efficiency Consultants, we are committed to providing the highest quality energy consulting services to homebuilders, architects, and developers across Massachusetts.
24/7 Support
Sign up for our newsletter to receive exclusive updates, tips, and insights about energy-efficient building practices, financial incentives, and the latest energy code requirements in Massachusetts.
68 South St – Framingham MA
© 2025, All Rights Reserved.
