HERS Rating New Construction Boston MA | Stretch Code Compliance

Published: May 2026 | BostonHERS RatingNew Construction

Boston has adopted the MA Stretch Code, meaning all new residential construction in the city must achieve a HERS score of 55 or below and pass blower door and duct leakage testing. Here’s everything Boston builders need to know.

Does Boston Require the MA Stretch Code?

Yes. Boston is one of the earliest and most committed Massachusetts municipalities to adopt the Stretch Energy Code. All new residential construction in Boston — including single-family homes, multifamily buildings, and ADUs — must comply with MA Stretch Code requirements.

HERS Rating Requirements for Boston New Construction

• HERS Index score of 55 or below (certified by RESNET-certified rater)
• Blower door test: ≤ 3.0 ACH50
• Duct leakage testing: meeting IECC/Stretch Code limits
• Compliance documentation for the Boston Inspectional Services Department

Boston-Specific Considerations

Boston’s urban construction environment presents some unique considerations for energy testing:

• Multifamily projects: Most Boston new construction is multifamily. Pricing is per unit ($650–$1,200/unit) and testing can often be coordinated for multiple units in a single visit.
• Historic buildings: Renovations of historic buildings in Boston may have different code pathways — consult your HERS Rater early.
• Green Building requirements: Boston’s Climate Action Plan and BERDO regulations may create additional documentation requirements for larger projects.

How Much Does a HERS Rating Cost in Boston?

HERS Rating pricing in Boston follows our standard Massachusetts rates: Single-family $1,850–$2,500 · Multifamily $650–$1,200 per unit · ADU $1,600–$1,850. No travel surcharge for Boston.