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Massachusetts Stretch and Specialized Opt-in energy codes
Massachusetts Stretch Energy Code and Specialized Opt-in Code (225 CMR 22)
As of 2026-10-22. Read from the Massachusetts Department of Energy Resources page.
Key features
- Code in force: Stretch Energy Code (225 CMR 22, residential), IECC 2021 with Massachusetts amendments; Specialized Code adds Appendix RC
- In force since: latest version dated 2025-02-14
- Adoption: Opt-in by municipality; the base code is statewide mandatory
- DOER's page maps which level of code each municipality follows; counts are not repeated here.
- Proposed 2026 revisions: public hearing held 2026-06-16, comments closed 2026-06-24; no final adoption date found.
- Read from the DOER page in a browser on 2026-10-22.
Governing body
Massachusetts DOER / BBRS
Region
MA
Category
code