Blower Door Testing Cape Cod, MA
Professional blower door air tightness testing in Cape Cod, Massachusetts. RESNET-certified technicians providing fast, accurate results for MA Stretch Energy Code compliance and Mass Save eligibility.
Schedule a Test Call 617-584-18092026 Massachusetts Energy Code Facts — Cape Cod
Cape Cod builders must comply with the Massachusetts energy code in force locally — Base, Stretch (225 CMR 22), or the Municipal Opt-in Specialized Code (225 CMR 23). As of the June 2026 Mass.gov adoption list, 242 of 351 Massachusetts municipalities enforce the Stretch Code and 60 have opted into the Specialized Code. New homes under the Stretch Code must reach a maximum HERS Index of 42 (mixed-fuel) or 45 (all-electric), verified by a RESNET-certified HERS rater.
- Energy code status: See the Mass.gov municipal adoption list for current status (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 Cape Cod services: HERS Rating Cape Cod · Duct Leakage Testing Cape Cod · Stretch Code Compliance Cape Cod · 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 Cape Cod Energy Code
Do I need a HERS rating for a new home in Cape Cod?
Most of the region does — 242 of 351 Massachusetts municipalities enforce the Stretch Code, which requires a certified HERS rating for new dwellings. Check your town on the Mass.gov adoption list or call us and we’ll confirm your requirements.
What is the maximum HERS score allowed in Cape Cod?
In Stretch Code communities, new homes must score HERS 42 or lower (mixed-fuel) or 45 or lower (all-electric); ADUs fall in the 52–58 range and major alterations/additions in the 65–75 range.
What building energy code is Cape Cod on right now?
It varies by municipality: 242 Massachusetts towns enforce the Stretch Code, 60 the Specialized Opt-in Code, and 49 the Base Code as of the June 2026 Mass.gov list.
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.
Detail sourced from the 2025 Massachusetts Stretch & Specialized Codes Technical Guidance (DOER, Sept 2025), Table R406.5 and Appendix RC.
Blower Door Testing in Cape Cod, MA
HERS Rating Company provides certified blower door testing in Cape Cod, Massachusetts. Our RESNET-accredited technicians use calibrated equipment to precisely measure your building’s air leakage rate — delivering the documentation you need for code compliance, permit sign-off, and Mass Save incentives.
What Is a Blower Door Test?
A blower door test uses a powerful, calibrated fan temporarily installed in a doorway to pressurize or depressurize your home. By measuring airflow at a standardized pressure of 50 Pascals, we determine exactly how much air is leaking through the building envelope — expressed as ACH50 (air changes per hour).
Under the Massachusetts Stretch Energy Code (IECC 2021), new homes in Cape Cod must achieve 3.0 ACH50 or less. We perform the test and provide all documentation required by the Cape Cod building department.
Why Cape Cod Builders Rely on Our Blower Door Testing
- Code-Required — Mandatory for all new residential construction in Cape Cod under MA Stretch Code
- Fast Turnaround — Digital test reports delivered within 24 hours
- Mass Save Eligible — Results accepted for all Mass Save rebate and incentive programs
- HERS Integration — Blower door results feed directly into your HERS Index score
- Experienced Team — RESNET-certified with thousands of tests completed across Massachusetts
- Green Certification — Required for LEED, Energy Star, and Zero Energy Ready Home programs
What’s Included in Our Cape Cod Blower Door Test
- Pre-test site preparation and building walkthrough
- Calibrated Minneapolis Blower Door system installation
- Pressurization and depressurization measurements at 50 Pa
- Digital test report with ACH50 result and code compliance determination
- Optional infrared thermography to pinpoint air leakage locations
- All documentation required for Cape Cod building department submittal
Blower Door Testing for Mass Save in Cape Cod
Many Mass Save programs require blower door testing to verify home performance before rebates are paid. Our certified technicians provide the official test reports accepted by Mass Save program administrators, helping Cape Cod homeowners and builders maximize energy efficiency incentives.
Schedule your blower door test in Cape Cod, MA today — fast results, competitive pricing.
Get a Free Quote Call 617-584-1809Related Services in Cape Cod
HERS Rating Cape Cod MA | Duct Leakage Testing Cape Cod MA | Stretch Code Compliance Cape Cod MA