Top-Rated Insulation Installers in Worcester, MA

3 local companies ranked by 269 Google reviews. Free to compare, no sign-up.

Ratings collected September 2026 · Page updated September 30, 2026

3Companies
269Google reviews
4.9★Average rating
Sep 2026Data collected
Ranked by Google reviewsNever paid forFree to compare

Short answer: The top-rated insulation installers in Worcester are Modern Energy (4.9★, 202 reviews), Custom Insulation Company, Inc. (4.8★, 56 reviews), Green Insulation Group (5.0★, 11 reviews).

Insulation installers in Worcester, ranked 3 listed

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  1. 1
    Modern EnergyTop pickMost reviewsAlso installs heat pumps and solar
    4.9 (202 Google reviews)
    24 Rockdale St, Worcester, MA 01606
    Call (508) 449-0449WebsiteGoogle reviewsProfileDirectionsEmail [email protected]
  2. 2
    Custom Insulation Company, Inc.Top pick
    4.8 (56 Google reviews)
    16 Jacques St, Worcester, MA 01603
    Call (508) 488-9999WebsiteGoogle reviewsDirectionsEmail [email protected]
  3. 3
    Green Insulation GroupTop pick
    5.0 (11 Google reviews)
    10 Pullman St, Worcester, MA 01601
    Call (617) 975-3300WebsiteGoogle reviewsDirectionsEmail [email protected]

Together these 3 companies average 4.9★ across 269 reviews. Modern Energy has the most reviews (202).

Ranked by Google rating weighted by review count, collected September 2026. Rankings are never paid for. How we rank and how we make money.

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What a insulation costs in Worcester

Typical installed priceVaries by area

Price depends on which areas you insulate (attic, walls, basement) and how much air sealing is needed. Ask each company for a price per area and the R-value you end up with, so quotes are easy to compare.

Rebates open in WorcesterNone confirmed right now

Financing or future programs may still help. Check the rebate page before you sign.

Rebates: our verified program data, checked monthly. Always confirm the exact amount for your home.

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Why insulation matters in Worcester

In Worcester, the average January low is -6°C (21°F), colder than 65% of the 123 cities we track. Sealing air leaks and topping up the attic usually pays back fastest here. Basement walls and rim joists are often the next biggest heat loss in older homes.

Most rebate programs pay only after an energy assessment, and some need one before the work too. Book it first.

Source: Open-Meteo historical weather data, 2015-2024.

Before you hire a insulation installer

  1. Ask whether they will air-seal before insulating, and what they will seal (attic hatch, pot lights, pipes, top plates).
  2. Ask for the R-value before and after for each area, and the material and depth they will install.
  3. Ask whether your rebate needs an energy assessment before and after the work, and who books it.
  4. Ask how they handle ventilation and any old insulation that could contain vermiculite (asbestos risk).

Before you call anyone, check what insulation rebates you can get in Worcester. Many programs require approval or a registered contractor before work starts.

Planning more upgrades? See the top-rated heat pump installers, solar installers, home battery installers in Worcester.

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