Blower Door Testing in Wilmington, 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 Wilmington, MA.
2026 Massachusetts Energy Code Facts — Wilmington
Wilmington 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 Wilmington services: HERS Rating Wilmington · Duct Leakage Testing Wilmington · Stretch Code Compliance Wilmington · 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 Wilmington Energy Code
Is a HERS rating required in Wilmington, MA?
Not by local code — Wilmington 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 Wilmington?
There is no mandatory HERS maximum under the Base Code in Wilmington, but the ERI compliance path follows IECC 2021 limits, and Mass Save incentive tiers require HERS 45 or better for the ENERGY STAR® tier.
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Wilmington 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 Wilmington Projects
As one of only 49 Base Code communities, Wilmington 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 Wilmington 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 Wilmington adopts the Stretch Code at a future town meeting, the table above becomes mandatory — surrounding towns already enforce it, so Wilmington 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 Wilmington, Massachusetts
RESNET and BPI-certified blower door air leakage testing for new construction, Mass Save programs, and MA Stretch Code compliance in Wilmington, MA. We measure air infiltration in CFM50 and ACH50 — the standard metrics required for Stretch Code compliance.
New construction in Wilmington 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 Wilmington
- Free Quote: Contact us for a transparent quote for blower door testing in Wilmington. 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 Wilmington
HERS Rating in Wilmington
Blower door testing is included in every HERS Rating.
Learn More →
Duct Leakage Testing in Wilmington
Often scheduled together to minimize mobilization costs.
Learn More →
MA Stretch Code in Wilmington
Full IECC 2021 compliance — blower door is required at 3.0 ACH50.
Learn More →
Frequently Asked Questions — Blower Door Testing in Wilmington
How much does blower door testing cost in Wilmington, MA?
Blower door testing pricing in Wilmington: 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 Wilmington?
New residential construction in Wilmington 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 Wilmington?
The on-site blower door test in Wilmington 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 Wilmington. Our certified results are accepted by all Mass Save program administrators.
More Cities Near Wilmington
Schedule Blower Door Testing in Wilmington
Contact HERS Rating Company for a free quote on blower door testing in Wilmington, MA. RESNET and BPI-certified, 24-hour turnaround.
Also Serving Nearby Cities
We provide Blower Door Testing services throughout the region. Nearby cities we serve: Burlington · Woburn · Reading · Tewksbury · Billerica