ADU Energy Rating Massachusetts: Builder’s Guide 2026
Every new ADU in a MA Stretch Code municipality requires a HERS Rating for energy code compliance. HERS Rating Company specializes in ADU energy ratings: $1,600–$1,850 per unit.
ADU Energy Code Requirements in Massachusetts
ADUs need: a RESNET-certified HERS Rating, blower door test (3.0 ACH50 or less), and duct leakage test (under 4%) in Stretch Code municipalities. HERS Rating Company manages full ADU compliance.
ADU HERS Rating Costs
$1,600–$1,850 per ADU — includes plan review, energy modeling, blower door test, duct leakage test, and HERS certificate.
Popular ADU Locations
Boston | Cambridge | Somerville | Brookline. Call 617-584-1809.