What does attic insulation cost in Boston?
Because Mass Save takes 75 to 100 percent off approved work, your share is usually a fraction of the contractor's price.1
Blown-in cost by R-value (before Mass Save)
| R-value | Min. thickness | National cost per 1,000 sq ft |
|---|---|---|
| R-38 | 13.0 in | $840–$1,500 |
| R-49 | 16.5 in | $1,100–$1,900 |
| R-60 | 20.0 in | $1,400–$2,400 |
Source: HomeGuide (national, blown-in).2
What 75% off looks like
| Approved work (our illustration) | Price | Your 25% share |
|---|---|---|
| R-60 blown-in, 1,000 sq ft2 | $1,400–$2,400 | $350–$600 |
| Air sealing3 | $350–$3,000 | $88–$750 |
Our arithmetic at the 75% level using HomeGuide national prices; Mass Save decides which work is approved.1 Income-eligible households can get it at no cost.4
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Mass Save's 0% HEAT Loan covers up to $25,000 of qualified improvements, subject to lender approval.1
Other line items
- Air sealing: $350 to $3,000 nationally.3
- Removing old insulation: $1 to $2 per sq ft.3
- Soffit baffles: $2 to $3 each.3
- Minimum job charges of $1,500 to $2,000 at some companies.2
Common questions
How much does attic insulation cost in Boston with Mass Save?
Mass Save takes 75 to 100 percent off approved work. At 75% off, an R-60 blown-in job priced at $1,400 to $2,400 would leave $350 to $600 for you (our arithmetic on HomeGuide national prices).
Is there financing?
Yes. The 0% HEAT Loan covers up to $25,000 of qualified improvements, subject to approval.
Does Mass Save cover municipal utility customers?
No. Mass Save says municipal utility customers should contact their utility directly.
Is there still a federal tax credit for insulation?
No. The IRS says the Energy Efficient Home Improvement Credit covers improvements made through December 31, 2025.
General information summarized from the public sources listed below. It isn't professional, engineering or legal advice. Codes and programs change; confirm current requirements with your local building department or utility before you start.
Sources
- Mass Save, "Insulation & Air Sealing"
- HomeGuide, "Blown-In Insulation Cost" (national figures, Nov. 5, 2025)
- HomeGuide, "Attic Insulation Cost" (national figures, Jan. 13, 2026)
- Mass Save, "Income-Based Assistance" (2026–2027 heating season income limits)
- U.S. EPA, "Protect Your Family from Asbestos-Contaminated Vermiculite Insulation"