New Construction Energy Code Massachusetts 2026: Builder FAQ
The most common energy code questions from Massachusetts builders and developers, answered by HERS Rating Company — Massachusetts’ leading RESNET-certified HERS provider.
Q: What energy code applies to new homes in Massachusetts?
A: Most new homes in Massachusetts must comply with the MA Stretch Code 2021 (based on IECC 2021). Over 270 MA municipalities have adopted the Stretch Code. A smaller number use only the Base Code (IECC 2021), and some cities like Cambridge require the even more stringent Specialized Stretch Code.
Q: Do I need a HERS Rating for every new home?
A: Yes, in Stretch Code and Specialized Stretch Code municipalities, you need a RESNET-certified HERS Rating for every new residential unit. HERS Rating Company provides fast, affordable HERS Ratings for single-family, multifamily, and ADU projects across all 351 MA cities.
Q: What tests are required for new construction energy code in Massachusetts?
A: Required tests: (1) Blower Door Test — must pass 3.0 ACH50 or less. (2) Duct Leakage Test — must be under 4% total leakage. (3) HERS Rating — must achieve HERS 55 or below (Stretch Code) or HERS 42 or below (Specialized Stretch Code). HERS Rating Company performs all three.
Q: How much does energy code compliance cost in Massachusetts?
A: HERS Rating Company’s all-inclusive pricing: Single-family $1,850–$2,500 | Multifamily $650–$1,200/unit | ADU $1,600–$1,850. All prices include plan review, blower door test, duct leakage test, energy modeling, and HERS certificate. No hidden fees.
Q: What happens if I fail the blower door test?
A: HERS Rating Company provides a detailed report identifying air leakage locations. Your air sealing contractor makes corrections, and HERS Rating Company retests. We work with builders throughout Massachusetts to achieve first-time pass rates. Call 617-584-1809 for help.
Q: Can I get Mass Save rebates for new construction?
A: Yes! HERS Rating Company helps builders qualify for Mass Save new construction rebates of $2,500–$5,000 per home. We handle all Mass Save documentation. Learn more about Mass Save rebates →
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