Blower Door Testing in New Marlborough, MA — Base Code Town
RESNET and BPI-certified blower door air leakage testing for new construction, Mass Save programs, and MA Stretch Code compliance in New Marlborough, MA.
2026 Massachusetts Energy Code Facts — New Marlborough
New Marlborough 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. New homes in Massachusetts (Climate Zone 5) must test at or below 3.0 ACH50 on the blower door test.
- 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 New Marlborough services: HERS Rating New Marlborough · Duct Leakage Testing New Marlborough · Stretch Code Compliance New 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.
Common Questions About the New Marlborough Energy Code
Is a HERS rating required in New Marlborough, MA?
Not by local code — New Marlborough 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.
What HERS score is required in New Marlborough?
There is no mandatory HERS maximum under the Base Code in New Marlborough, 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 New Marlborough follow in 2026?
New Marlborough 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 New Marlborough Projects
As one of only 49 Base Code communities, New Marlborough 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 New Marlborough 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 New Marlborough adopts the Stretch Code at a future town meeting, the table above becomes mandatory — surrounding towns already enforce it, so New Marlborough 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.
Professional Blower Door Testing Services in New Marlborough, Massachusetts
RESNET and BPI-certified blower door air leakage testing for new construction, Mass Save programs, and MA Stretch Code compliance in New Marlborough, MA. We measure air infiltration in CFM50 and ACH50 — the standard metrics required for Stretch Code compliance.
New construction in New Marlborough must achieve 3.0 ACH50 or less under the MA Stretch Code. Our certified test results are accepted by all Massachusetts building departments, utilities, and Mass Save program administrators.
Our Blower Door Testing Process in New Marlborough
- Free Quote: Contact us for a transparent quote for blower door testing in New Marlborough. Package pricing with HERS Rating available.
- Schedule Test: We schedule at a time convenient for your construction timeline — including intermediate tests during framing.
- On-Site Testing: Our certified technician installs the blower door fan and records CFM50 and ACH50 measurements.
- Report Delivery: Certified blower door report delivered within 24 hours — ready for permits, Mass Save, and HERS Rating.
Related Services in New Marlborough
HERS Rating in New Marlborough
Blower door testing is included in every HERS Rating.
Learn More →
Duct Leakage Testing in New Marlborough
Often scheduled together to minimize mobilization costs.
Learn More →
MA Stretch Code in New Marlborough
Full IECC 2021 compliance — blower door is required at 3.0 ACH50.
Learn More →
Frequently Asked Questions — Blower Door Testing in New Marlborough
How much does blower door testing cost in New Marlborough, MA?
Blower door testing pricing in New Marlborough: Single-family homes $1,850–$2,500 (when combined with HERS Rating) · Standalone blower door tests start from $1,850. Contact us for a free quote — package pricing available when combined with duct leakage testing and HERS Rating.
What is the blower door requirement in New Marlborough?
New residential construction in New Marlborough under the MA Stretch Code must achieve 3.0 ACH50 or less. The IECC 2021 base code requires 5.0 ACH50 or less.
How long does a blower door test take in New Marlborough?
The on-site blower door test in New Marlborough takes 1–2 hours. We deliver your certified test report within 24 hours.
Is blower door testing required for Mass Save rebates?
Yes. Blower door testing is required for Mass Save air sealing and insulation rebates in New Marlborough. Our certified results are accepted by all Mass Save program administrators.
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Schedule Blower Door Testing in New Marlborough
Contact HERS Rating Company for a free quote on blower door testing in New Marlborough, MA. RESNET and BPI-certified, 24-hour turnaround.