Massachusetts Stretch Energy Code Cape Cod, MA
Expert Massachusetts Stretch Energy Code compliance services in Cape Cod, MA. RESNET-certified HERS raters helping builders meet IECC 2021 requirements and obtain certificates of occupancy.
Get Compliance Help 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.
- 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 · Blower Door Testing Cape Cod · Duct Leakage Testing 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
Is a HERS rating required in Cape Cod, MA?
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 HERS score is required 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.
Which energy code does Cape Cod follow in 2026?
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.
MA Stretch Energy Code Compliance in Cape Cod
HERS Rating Company provides comprehensive Massachusetts Stretch Energy Code compliance services in Cape Cod, MA. Our RESNET-certified HERS raters guide builders, developers, and contractors through the full IECC 2021 compliance process — from energy modeling to final certification.
The Massachusetts Stretch Energy Code applies to all new residential construction and major renovations in Cape Cod and most Massachusetts municipalities. Non-compliance can delay or prevent your certificate of occupancy. Our team ensures your project meets every requirement, on schedule.
What Is the Massachusetts Stretch Energy Code?
The Massachusetts Stretch Energy Code is an optional appendix to the base Massachusetts energy code that sets higher performance standards for buildings. Since its adoption, the Stretch Code has become mandatory in most Massachusetts communities — including Cape Cod — and is based on IECC 2021 with Massachusetts amendments.
The Stretch Code requires third-party verification by a certified HERS rater for all new residential construction. Key requirements include: maximum air leakage of 3.0 ACH50, duct leakage limits, minimum HERS Index scores, and mandatory blower door and duct leakage testing.
MA Stretch Code Requirements in Cape Cod
- HERS Rating Required — Third-party HERS certification by a RESNET-accredited rater
- Blower Door Test — Maximum 3.0 ACH50 air leakage at 50 Pascals
- Duct Leakage Test — Maximum 4 CFM25 per 100 sq ft of conditioned floor area
- Energy Modeling — REM/Rate or equivalent software used to verify compliance
- Insulation Verification — Confirmed R-values for walls, roof, and foundation
- Window Performance — U-factor and SHGC requirements per IECC 2021
- Mechanical Ventilation — Balanced ventilation system verification
Our Stretch Code Compliance Services in Cape Cod
- Pre-construction energy modeling and compliance review
- HERS Index rating and certification
- Blower door air tightness testing
- Duct leakage and duct tightness testing
- Pre-drywall and final on-site inspections
- Complete documentation package for Cape Cod building department
- Certificate of occupancy support and follow-up
Why Choose HERS Rating Company for Stretch Code in Cape Cod?
We specialize exclusively in Massachusetts energy code compliance. Our team has helped hundreds of builders in Cape Cod and across Massachusetts navigate the Stretch Code process efficiently. We understand exactly what Cape Cod’s building department needs, and we deliver complete, accurate documentation every time.
We also help identify opportunities to improve energy performance beyond minimum code requirements — helping your Cape Cod clients qualify for Mass Save rebates and green building certifications like Energy Star and Zero Energy Ready Home.
Need Stretch Energy Code compliance help in Cape Cod, MA? Contact our experts today.
Get a Free Consultation Call 617-584-1809Related Services in Cape Cod
HERS Rating Cape Cod MA | Blower Door Testing Cape Cod MA | Duct Leakage Testing Cape Cod MA