Mass Save Insulation & Air Sealing Rebates

National Grid / Mass Save

Available Weatherization

About This Program

Mass Save Insulation & Air Sealing Rebates is available to homeowners in Westborough, MA.

Rebates covering 75% of insulation and air sealing costs for National Grid customers, up to 100% for income-eligible households. Includes attic, wall, and basement insulation plus air sealing. Must complete Mass Save Home Energy Assessment first.

Estimate assumes 75% rebate on typical insulation project

Official program page checked live on 2026-06-22.

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

In Westborough, MA, you can combine this program with other local help to cut your cost:

Key Details

  • 75% rebate on insulation and air sealing
  • 100% rebate for income-eligible customers
  • Covers attic, walls, basement, and rim joists
  • Requires Home Energy Assessment first
  • Must use Mass Save qualified contractor

How to Apply

Get free help applying Visit Official Program Page Track this program

(866) 527-7283

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

This grant requires a licensed contractor

This grant requires the work to be done by a licensed contractor, and you will likely need a written estimate to apply. Get a free estimate from a contractor in Westborough who knows grant paperwork.

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

Questions about this program?

Ask us. It is free, and a real person answers within a business day.

Email us about this program

Frequently asked questions

How much can Mass Save Insulation & Air Sealing Rebates provide in Westborough, MA?

Up to 100% rebate (income-eligible).

Who qualifies for Mass Save Insulation & Air Sealing Rebates in Westborough?

Mass Save Insulation & Air Sealing Rebates is open to homeowners in Westborough, MA. It has no income limit.

How do I apply for Mass Save Insulation & Air Sealing Rebates in Westborough, MA?

Apply directly with National Grid / Mass Save using the official program link on this page or call (866) 527-7283. There is no middleman and no fee.

Need a Contractor for This Grant?

Grant-approved contractors understand the documentation, inspections, and timelines, so your funding releases on schedule.

Get matched with a pro, free Browse Westborough, MA contractors

Find More Programs in Westborough, MA

This is just one of many grants, rebates, and free programs available. Stack them together to maximize your savings.

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