Stretch Code Help Shrewsbury MA - Quick Facts
Local energy code in Shrewsbury
- Shrewsbury enforces the Massachusetts Stretch Energy Code for new construction and major renovations. IECC Climate Zone 5A.
- Massachusetts has three energy-code levels - base (2021 IECC), Stretch, and Specialized (Opt-In) - and Shrewsbury is on the Stretch Code.
What your project must hit in Shrewsbury
- A HERS rating is required in Shrewsbury for: new construction; additions over 1,000 sq ft (or greater than 100% of the existing conditioned floor area); and extensive Level 3 alterations over 1,000 sq ft affecting more than 50% of the conditioned floor area.
- New home, mixed-fuel (gas heat, hot water or cooking): must reach HERS 42 or lower.
- New home, all-electric: must reach HERS 45 or lower.
- Embodied-carbon materials credit: allows up to HERS 48.
- ADU, mixed-fuel (gas): HERS 52; ADU, all-electric: HERS 55; ADU with the embodied-carbon credit: HERS 58.
- Major additions and renovations: HERS 65 (mixed-fuel) or HERS 70 (all-electric).
- Air tightness: a blower door test at 3.0 ACH50 or tighter; duct leakage capped at 4.0 CFM25 per 100 sq ft total leakage (8.0 when all ducts are inside conditioned space - the test is still required).
- Also required in new homes: whole-house mechanical ventilation (ASHRAE 62.2) and EV-ready wiring; compliance runs through the HERS / Energy Rating Index path (2025 code section R406).
How compliance is verified
- Energy model from your plans, a pre-drywall (rough) inspection, blower door and duct leakage testing, then a final HERS certificate filed with the Shrewsbury building department.
- Same-day preliminary HERS reports; blower door and duct results in 24-48 hours, with fail-fix guidance if a home misses the target.
2026 Mass Save incentives in Shrewsbury
- 2026 Mass Save all-electric new construction: $7,500 (Base) to $15,000 (ENERGY STAR NextGen) to $25,000 (Passive House) per single-family home - up to $40,000 for a 4-unit.
- All-electric renovations and additions: up to $20,000 (Level 1) or $30,000 (Level 2) for a single-family, scaling to $60,000 for a 4-unit; projects that keep fossil fuel use pay-for-savings up to $10,000.
- New multifamily (5+ units): $1,000 to $3,750 per unit by tier (Base, ENERGY STAR, or Passive House), plus a $5,000 feasibility-study incentive and energy-modeling support.
- All Mass Save incentives require verification by a Mass Save-approved, RESNET-certified HERS rater.
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Shrewsbury, MA Stretch Energy Code Support
Get help with Massachusetts stretch energy code compliance in Shrewsbury, MA for new construction, additions, and renovations. Home Energy Efficiency Consultants helps builders, homeowners, and developers plan for compliance, avoid delays, and move projects toward approval.
Support for projects in Shrewsbury
We help with insulation strategy, air sealing planning, ventilation, mechanical review, and documentation support for projects in Shrewsbury, Worcester.
Stretch Energy Code Support in Shrewsbury, MA
If you are building a new home, addition, or major renovation in Shrewsbury, Massachusetts, stretch energy code compliance may affect insulation, air sealing, HVAC selection, ventilation, and final testing.
Our stretch energy code support in Shrewsbury helps homeowners, builders, architects, and developers understand the practical side of Massachusetts energy code compliance. We help identify likely problem areas early so your project stays on track.
Whether your project is still in design or already under construction, we help you prepare for code requirements before they become expensive corrections.
Projects we support in Shrewsbury
- New construction homes
- Additions and major renovations
- Permit-driven code compliance
- Insulation and air sealing planning
- Testing and final inspection preparation
What We Help With in Shrewsbury
Stretch code projects in Shrewsbury often require careful planning. We help with the details that commonly affect approval and final inspection.
Insulation Planning
We help review wall, roof, floor, and foundation insulation strategies for projects in Shrewsbury.
Air Sealing Strategy
Air sealing is one of the biggest reasons projects fail testing. We help identify weak points before final inspection.
HVAC and Ventilation Review
We help review heating, cooling, hot water, and balanced ventilation choices for code compliance.
Documentation Support
We help with the compliance side of the project so approvals and inspections are easier to manage.
Field Guidance
We explain what needs to happen in the field so the finished project lines up with the energy plan.
Testing Readiness
We help prepare projects in Shrewsbury for blower door testing and final compliance steps.
Why Choose Us for Stretch Energy Code Support in Shrewsbury?
We provide practical help for projects in Shrewsbury, not just generic code language.
- Massachusetts-focused energy code experience
- Fast turnaround and clear communication
- Guidance on insulation, ventilation, and air sealing
- Help preparing for blower door testing
- Support for homeowners, builders, and developers
Most stretch energy code support jobs in Shrewsbury fall in this range depending on project size, complexity, and scope.
Common Projects We Support in Shrewsbury, MA
Helpful for projects that often run into energy code questions and permit delays.
New Homes
New construction in Shrewsbury often requires detailed planning for insulation, HVAC, ventilation, and testing.
Additions
Additions can trigger energy code requirements depending on size, scope, and permit path.
Major Renovations
Large remodels and gut renovations often need better coordination between plans, jobsite details, and final testing.
Worcester Area Projects
We support energy code compliance work in Shrewsbury and surrounding areas throughout Worcester.
Nearby Energy Code Help Areas
We also help projects near Shrewsbury, including nearby Massachusetts communities.
Energy Code Path for Shrewsbury Projects
The state's municipal adoption list shows Shrewsbury on the Stretch Code, effective January 1, 2018; it has not adopted the Specialized (Opt-In) Code.
Think of the HERS target as a budget. In Shrewsbury, we run the plans through energy modeling first, then verify insulation and air sealing on site before drywall, and close out with blower door and duct testing so the score holds at final inspection.
What the code asks of Shrewsbury projects:
| Project type | What it means in Shrewsbury |
|---|---|
| New homes | HERS 42 for mixed-fuel homes, HERS 45 for all-electric homes, or certification through Passive House. |
| Large additions and renovations | Projects adding over 1,000 sq ft or more than 100% of the existing home need HERS 65 (mixed-fuel) or HERS 70 (all-electric). |
| Smaller additions and alterations | REScheck or the prescriptive path is usually enough. |
| Commercial | COMcheck works for commercial buildings up to 20,000 sq ft. |
Fuel choice matters early: an all-electric design with heat pumps moves the target from HERS 42 to 45 (or 65 to 70 on a large renovation), which can save money on insulation or windows.
In Shrewsbury, permits are handled by the Building Department. Permits are filed through the town's online permitting system, with fees paid through Unibank. The Building Department has handled all electrical permits since 2019, and some electrical permits need a SELCO work request number.
Electric service in Shrewsbury comes from Shrewsbury Electric & Cable Operations (SELCO), a municipal light plant, which is worth knowing when you plan heat pumps or solar for an all-electric HERS target. Shrewsbury is an adjacent community on the state's Section 3A compliant list. New multifamily projects under that zoning still have to meet the energy code targets above.
HEEC serves Shrewsbury from our Marlborough office at 272 Lincoln St, Suite C1, handling HERS ratings, blower door testing, and REScheck or COMcheck reports.
FAQ About Stretch Energy Code Support in Shrewsbury
Common questions from homeowners, builders, and developers in Shrewsbury, Massachusetts.
What is stretch energy code support in Shrewsbury?
Stretch energy code support helps projects in Shrewsbury plan for Massachusetts energy code compliance, including insulation, air sealing, ventilation, documentation, and testing readiness.
Who needs energy code help in Shrewsbury?
Homeowners, builders, architects, and developers in Shrewsbury may need help when working on new homes, additions, or major renovations.
Do you help prepare for blower door testing in Shrewsbury?
Yes. We help identify common leakage areas and prepare projects in Shrewsbury for final blower door testing.
How much does stretch code support cost in Shrewsbury?
Most projects range from $900 to $2,500 depending on size, complexity, and the level of support needed.
Which energy code applies to new homes in Shrewsbury?
The state's adoption list shows the Stretch Code in effect in Shrewsbury since January 1, 2018. New homes there target HERS 42 (mixed-fuel) or HERS 45 (all-electric), or can follow the Passive House path; Shrewsbury has not adopted the Specialized (Opt-In) Code.
Who provides electric service for heat pump and solar projects in Shrewsbury?
Shrewsbury is served by Shrewsbury Electric & Cable Operations (SELCO), a municipal light plant, so coordinate electric service questions for all-electric designs and solar with them while we handle the energy code documentation.
Need Stretch Energy Code Support in Shrewsbury, MA?
Contact Home Energy Efficiency Consultants for help with insulation planning, air sealing, testing preparation, and Massachusetts energy code compliance in Shrewsbury.
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HERS Ratings Across Shrewsbury and Nearby Communities
Home Energy Efficiency Consultants rates new homes, additions, and major renovations throughout Shrewsbury — including Shrewsbury Center, Edgemere, and White City. Every Shrewsbury project is filed with the Town of Shrewsbury Building Department, and we handle the energy model, blower door and duct leakage testing, and the compliance paperwork from start to finish.
We also serve the communities right around Shrewsbury, including Worcester, Westborough, Northborough, Grafton, and Boylston. Our Marlborough office at 272 Lincoln St is the closest of our four Massachusetts locations — see our Marlborough office or call (617) 501-6788 to get a Shrewsbury rating on the schedule.
More Massachusetts Towns We Serve
Certified HERS ratings, blower door testing and energy code compliance across all 351 Massachusetts cities and towns.
