- 6175841809
- hersratingcompany@gmail.com
- 12 Pond St Ashland, MA 01721 United States
- 573 Washington St Quincy, MA 02169 United States
Certified HERS Rater serving Marlborough, Massachusetts — helping builders, developers & homeowners meet the Massachusetts Stretch Energy Code and qualify for Mass Save incentives.
Get a Free QuoteCall 617-584-1809Marlborough enforces the Massachusetts Stretch Energy Code (225 CMR 22), adopted effective 1/1/2012. Under the 2025 code update (current for 2026 permits), new homes in Marlborough must reach a maximum HERS Index of 42 (mixed-fuel) or 45 (all-electric) — up to 48 with qualifying credits — verified by a RESNET-certified HERS rater. ADUs must meet HERS 52–58, and major alterations, additions or change-of-use projects HERS 65–75, depending on fuel type and on-site solar.
Related Marlborough services: Blower Door Testing Marlborough · Duct Leakage Testing Marlborough · Stretch Code Compliance Marlborough · MA Energy Codes Guide — or get a free quote from our RESNET-certified team (617-584-1809).
Sources: 2025 DOER Massachusetts Stretch & Specialized Codes Technical Guidance (Sept 2025); Mass.gov Building Energy Code Adoption by Municipality (June 2026); Mass Save 2026 Residential New Construction program.
Yes. Marlborough has enforced the Massachusetts Stretch Energy Code since 1/1/2012, so new dwellings need a certified HERS rating from a RESNET-accredited rater — with blower door and duct leakage testing — before the certificate of occupancy.
Homes permitted in Marlborough today must score HERS 42 or lower (mixed-fuel) or HERS 45 or lower (all-electric), up to 48 with qualifying credits. ADUs fall in the HERS 52–58 range and major alterations/additions in the 65–75 range, depending on fuel type and on-site solar.
Marlborough is one of 242 of Massachusetts’ 351 municipalities enforcing the Stretch Energy Code (225 CMR 22) per the June 2026 Mass.gov adoption list; 60 towns have gone further to the Specialized Code and 49 remain on the Base Code.
These are the official maximum HERS Index scores that apply to projects in Marlborough under Table R406.5 of the current code (2025 DOER Technical Guidance):
| Building type | New construction (permits after 7/1/2024) | New construction w/ embodied-carbon credit (R406.5.2) | Accessory Dwelling Units | Major alterations, additions, change of use |
|---|---|---|---|---|
| Mixed-fuel building | 42 | 45 | 52 | 65 |
| Mixed-fuel + solar electric | 42 | 45 | 55 | 70 |
| All-electric building | 45 | 48 | 55 | 70 |
| All-electric + solar electric | 45 | 48 | 58 | 75 |
Scores are measured before counting on-site renewable generation (per R406.5). Historic buildings may opt out for alterations under R503.1.1. Embodied-carbon credits (+3 points) come from low-GWP concrete and insulation EPDs per Table R406.5.3/R406.5.4.
Beyond the HERS maximums above, every new dwelling in Marlborough on the HERS pathway must satisfy four code sections — R403.6 (Ventilation), R404.4 (EV Ready), R406 (HERS) and Appendix RB (Solar Ready) — per the 2025 DOER Technical Guidance:
Passive House alternative (R405): Phius or PHI certification satisfies the code in Marlborough in place of a HERS score — with a Certified Passive House Consultant for design and a Phius Certified Verifier/Rater during construction — and still requires EV-Ready and Solar-Ready compliance. Prescriptive path: allowed only for buildings without individually separate dwelling units, additions, and alterations — and a whole-building prescriptive project must implement 2 of the 3 additional-efficiency packages in R408 (enhanced envelope, higher-efficiency HVAC, or reduced water-heating energy). Additions of 1,000 sq ft or more (or exceeding 100% of the existing floor area) must meet both R502.3 prescriptive and the R406.5 HERS limits. Level III alterations (work area over 50% of the home and over 1,000 sq ft) also trigger HERS compliance; historic buildings are exempt under R501.6. Note that ENERGY STAR® is no longer a compliance path — HERS and Passive House are the two certification routes in Marlborough.
Detail sourced from the 2025 Massachusetts Stretch & Specialized Codes Technical Guidance (DOER, Sept 2025), Table R406.5 and Appendix RC.
HERS Rating Company provides certified HERS Index ratings in Marlborough, Massachusetts. Our RESNET-accredited raters deliver fast, accurate energy ratings to keep your project on schedule and in full compliance with Massachusetts energy codes.
Whether building new or renovating in Marlborough, MA, a HERS rating gives you a verified measure of your home’s energy performance and a clear path to code compliance.
Marlborough rose as a shoe-manufacturing city and later a technology hub along I-495 and Route 20. Its older neighborhoods near downtown and French Hill hold Victorian-era homes and two-families built for mill workers, while extensive postwar and recent subdivisions ring the city. With strong corporate-driven growth fueling both new housing and renovations, HERS ratings and energy-code testing are a regular part of construction here.
The MA Stretch Energy Code requires all new residential construction to be verified by a certified HERS rater. Builders in Marlborough must meet IECC 2021 requirements including air tightness tested by blower door and duct leakage verified by duct leakage testing. We provide all documentation required by the Marlborough building department.
Ready to schedule your HERS rating in Marlborough, MA? Get a fast, free quote today.
Schedule Your HERS RatingCall 617-584-1809HERS Rating costs in Marlborough vary based on home size and project scope, but most single-family ratings fall within a competitive flat-rate range. Contact us at 617-584-1809 for a free quote tailored to your Marlborough project.
Yes. New homes in Marlborough must demonstrate energy code compliance, and a HERS Rating is the most common path to verify performance and qualify for Mass Save incentives under the Massachusetts Stretch Energy Code.
Most Marlborough projects receive their certified HERS report within 24 to 48 hours of the final inspection. We coordinate testing around your construction schedule to avoid delays.
The Massachusetts Stretch Energy Code generally requires a HERS Index score at or below the mid-50s for new construction, depending on home size and configuration. Our raters help your Marlborough project hit its target score.
At HERS Rating Company, we are committed to providing the highest quality energy consulting services to homebuilders, architects, and developers across Massachusetts.
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12 Pond St Ashland, MA 01721 United States
573 Washington St Quincy, MA 02169 United States
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