Massachusetts radon requirements for new construction
Massachusetts amendments to 2015 IRC Appendix F
What your permit set must show
- Massachusetts requires 2015 IRC Appendix F only within its three EPA Zone 1 counties: Worcester, Essex, and Middlesex.
- Outside those three counties, the requirement is not mandatory under the statewide code; confirm local adoption before assuming coverage.
- Appendix F carries the same substantive requirements as the current Appendix BE numbering: sub-slab depressurization piping, sealed soil-gas barrier, and sealed floor penetrations.
Common questions
Is a radon rough-in required statewide in Massachusetts?
No. The mandate applies within the three EPA Zone 1 counties — Worcester, Essex, and Middlesex — not the whole state.
What does the plans examiner check for in these counties?
Reviewers look for the 2015 IRC Appendix F rough-in components: sub-slab depressurization piping shown on the foundation plan, a sealed soil-gas barrier, and sealed penetrations through the slab.
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