MA Stretch Code Compliance in Holbrook, MA
Complete MA Stretch Code 2021 (IECC 2021) compliance services for new residential construction in Holbrook, MA — from plan review through HERS certification.
2026 Massachusetts Energy Code Facts — Holbrook
Holbrook is one of only 49 Massachusetts municipalities still on the Base Energy Code (10th Edition — IECC 2021 with MA amendments) as of the June 2026 Mass.gov adoption list — the Stretch Code does not apply here. HERS ratings remain an approved compliance path under the Base Code, and a RESNET-certified HERS rater is required to qualify for Mass Save® new-construction incentives.
- Energy code status: Base Code (10th Edition, IECC 2021 w/ MA amendments) — 1 of 49 MA municipalities (as of the June 2026 Mass.gov adoption list).
- Required testing & verification: blower door (air infiltration) testing, duct leakage testing, balanced mechanical ventilation (ERV/HRV), plus EV-ready and solar-ready provisions on the HERS compliance path.
- Mass Save® 2026 new-construction incentives: up to $25,000 per all-electric single-family home (Passive House tier; $7,500 base tier, $15,000 ENERGY STAR® NextGen tier — HERS ≤45), up to $40,000 for a 4-unit building, up to $3,750/unit for 5+ unit multifamily, and up to $30,000 for major all-electric renovations. Every tier requires enrollment and verification by an approved HERS rating company.
Related Holbrook services: HERS Rating Holbrook · Blower Door Testing Holbrook · Duct Leakage Testing Holbrook · 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.
Common Questions About the Holbrook Energy Code
Does Holbrook require a HERS rating in 2026?
Not by local code — Holbrook is one of just 49 Massachusetts municipalities still on the Base Energy Code (10th Edition, IECC 2021 with MA amendments), so the Stretch Code HERS mandate does not apply. A HERS rating is still an accepted compliance path and is required for Mass Save® new-construction incentives.
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There is no mandatory HERS maximum under the Base Code in Holbrook, but the ERI compliance path follows IECC 2021 limits, and Mass Save incentive tiers require HERS 45 or better for the ENERGY STAR® tier.
Which energy code does Holbrook follow in 2026?
Holbrook follows the Massachusetts Base Energy Code (10th Edition, IECC 2021 with amendments) as of the June 2026 Mass.gov adoption list — one of only 49 communities statewide that have not adopted the Stretch Code.
Official Maximum HERS Index Scores (Table R406.5)
For comparison, here is the official maximum-HERS table that applies in Massachusetts Stretch Code and Specialized Code communities (Table R406.5, 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.
What Base Code Status Means for Holbrook Projects
As one of only 49 Base Code communities, Holbrook projects follow the 10th Edition code (IECC 2021 with MA amendments) via the prescriptive path, the simulated-performance path, or the Energy Rating Index (HERS) path — without the Stretch Code’s lowered HERS caps shown above. Builders in Holbrook still order HERS ratings for the ERI compliance path, for Mass Save® incentives (which always require HERS verification), and to document energy performance for buyers. If Holbrook adopts the Stretch Code at a future town meeting, the table above becomes mandatory — surrounding towns already enforce it, so Holbrook builders often test to those standards today.
Detail sourced from the 2025 Massachusetts Stretch & Specialized Codes Technical Guidance (DOER, Sept 2025), Table R406.5 and Appendix RC.
MA Stretch Code 2021 Compliance Services in Holbrook, Massachusetts
Complete MA Stretch Code 2021 compliance services for new construction in Holbrook, MA. We manage the entire process — plan review, energy modeling, blower door testing, duct leakage testing, and final HERS certification — so your project meets all requirements.
Holbrook has adopted the MA Stretch Code, requiring new residential buildings to achieve: HERS score 55 or below · blower door 3.0 ACH50 or less · total duct leakage 4% or less. All requirements must be verified by a RESNET-certified rater.
Our MA Stretch Code Compliance Process in Holbrook
- Plan Review & Quote: Submit your building plans. We review them, model them to a HERS score, and provide a compliance roadmap and quote.
- Pre-Construction Modeling: We model your plans to a HERS score before construction begins — identifying compliance risks cost-effectively.
- Construction Phase Testing: Intermediate blower door and duct tests verify compliance during construction.
- Final Certification: Final HERS Rating, RESNET-certified compliance report, and documentation for your building department.
Related Services in Holbrook
HERS Rating in Holbrook
HERS score 55 or below required for MA Stretch Code.
Learn More →Blower Door Testing in Holbrook
3.0 ACH50 or less required under MA Stretch Code.
Learn More →Duct Leakage Testing in Holbrook
4% or less total duct leakage required for forced-air systems.
Learn More →Frequently Asked Questions — MA Stretch Code Compliance in Holbrook
How much does MA Stretch Code compliance cost in Holbrook?
MA Stretch Code compliance package pricing in Holbrook: Single-family homes $1,850–$2,500 · Multifamily (per unit) $650–$1,200 · ADUs $1,600–$1,850. Full package includes HERS Rating, blower door testing, and duct leakage testing. Contact us for a free, project-specific quote.
Does Holbrook require the MA Stretch Code?
Yes. Holbrook has adopted the MA Stretch Code, requiring new residential construction to achieve: HERS score 55 or below · blower door 3.0 ACH50 or less · total duct leakage 4% or less — all verified by a RESNET-certified rater.
How do I prove MA Stretch Code compliance in Holbrook?
Compliance is documented through a RESNET-certified HERS Rating report. Our reports are accepted by the Holbrook building department and all Massachusetts municipalities as proof of MA Stretch Code compliance.
What is included in the full MA Stretch Code compliance package?
Our full compliance package for Holbrook includes: energy modeling from building plans · blower door air leakage test · duct leakage test · final HERS Rating · RESNET-certified compliance report for the building department.
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Get MA Stretch Code Compliance in Holbrook
Contact HERS Rating Company for a free quote on MA Stretch Code 2021 compliance in Holbrook, MA. Full package: HERS Rating, blower door, and duct leakage testing.