Massachusetts Building Energy Code Adoption by Municipality

A map and list showing adoption of energy codes (Base Code, Stretch Code, Specialized Code) by all 351 Massachusetts municipalities with effective date.

Municipalities who have adopted the Specialized Energy Code: Acton, Amherst, Andover, Aquinnah, Arlington, Ashfield, Ashland, Bedford, Belmont, Beverly, Boston, Brookline, Cambridge, Carlisle, Chelmsford, Concord, Dedham, Eastham, Easthampton, Harvard, Hingham, Hopkinton, Lexington, Lincoln, Maynard, Medford, Melrose, Milton, Natick, Needham, Newburyport, Newton, Northampton, Norwood, Pelham, Salem, Sharon, Sherborn, Shutesbury, Somerville, Stockbridge, Stow, Sudbury, Swampscott, Truro, Wakefield, Warwick, Watertown, Wayland, Wellesley, Wellfleet, Wenham, Westborough, West Tisbury, Weston, Winchester, Worcester.

Building Energy Code by Municipality

Municipal Energy Code List v2.csv

Table displaying Building Energy Code by Municipality and Effective Date. To find a particular municipality, please use the Search function.
 

Massachusetts uses building energy codes to make residential, commercial and other types of buildings healthier and more energy-efficient. Building energy codes set standards for insulation, heating, cooling, lighting, and other building design elements that impact energy use and efficiency. They are intended to reduce energy costs, cut greenhouse gas emissions and support decarbonization of Massachusetts' building sector. 

As part of the Green Communities Act of 2008, Stretch code adoption is required to become a designated Green Community and to qualify for Green Community Competitive Grants. 

As part of the Act creating a Next-Generation Roadmap for Massachusetts Climate Policy of 2021, Specialized code adoption is required to become a Climate Leader Community and to qualify for Climate Leader Accelerator or Technical Assistance Grants.

As of March 2026:

• 243 Municipalities have adopted Stretch Code since 2010
• 58 Municipalities have adopted Specialized Code since 2023
• 59.48% of the population of Massachusetts reside in a community using Stretch Code
• 32.87% reside in a community using Specialized Code
• 7.65% reside in a community using Base Code 

For more information and supporting documents about Massachusetts building energy codes, please visit the Energy Efficiency Division's 2025 Massachusetts Building Energy Codes webpage.