Mass Save Insulation Rebate

National Grid / Mass Save

Available Weatherization

About This Program

Rebates covering 75% of insulation costs for all customers, and up to 100% for income-eligible households. Includes attic, wall, and basement insulation plus air sealing. Must have energy assessment first.

Rebate covers 75-100% of insulation project costs depending on income

Official program page checked live on 2026-06-17.

Data last verified 2026-06-09. How we verify our data.

Key Details

  • 75% rebate for all customers
  • 100% rebate for income-eligible households
  • Attic, wall, and basement insulation
  • Free energy assessment required first
  • 0% interest financing available

How to Apply

Get free help applying Visit Official Program Page Track this program

(866) 527-7283

A grant-savvy contractor in Shrewsbury, MA can handle the paperwork, inspections, and timelines so your funding releases on schedule. Getting matched is free.

You will likely need a contractor to apply

Projects like this almost always need a licensed contractor, and many grants ask for a written estimate as part of your application. Lining up a contractor in Shrewsbury early keeps your application moving.

Get matched with a contractor

Each program sets its own contractor rules. Check the official program page for exact requirements.

Your application paperwork

Documents you will likely need

  • Proof you own and live in the home (deed, recent mortgage statement, or property tax bill).
  • A government-issued photo ID for every owner on title.
  • A written estimate from a licensed contractor for the work (many programs require this to apply).
  • A recent utility bill for the home (energy and weatherization programs use it to confirm service and usage).
  • Photos of the problem area or the work to be done.
  • The program's own application form, completed (use the official link or phone number on this page).
Download this checklist (PDF)

Requirements vary by program and locality. Confirm the exact rules on the official program page. We can help you prepare your paperwork, but you submit it yourself.

Deadline: Ongoing

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