Top-Rated Insulation Installers in Boston, MA

3 local companies ranked by 99 Google reviews. Free to compare, no sign-up.

Ratings collected September 2026 · Page updated September 30, 2026

3Companies
99Google reviews
4.9★Average rating
Sep 2026Data collected
Ranked by Google reviewsNever paid forFree to compare

Short answer: The top-rated insulation installers in Boston are Diamond Dorchester Insulation Inc. (4.9★, 39 reviews), Quality Spray Foam Insulation Boston (4.9★, 34 reviews), Caliber Insulation (4.8★, 26 reviews).

Insulation installers in Boston, ranked 3 listed

Sort by
  1. 1
    Diamond Dorchester Insulation Inc.Top pickMost reviews
    4.9 (39 Google reviews)
    162 Rosseter St #3, Boston, MA 02121
    Call (339) 273-4450WebsiteGoogle reviewsDirections
  2. 2
    Quality Spray Foam Insulation BostonTop pick
    4.9 (34 Google reviews)
    798 Dorchester Ave #1, Boston, MA 02125
    Call (617) 958-5740WebsiteGoogle reviewsDirections
  3. 3
    Caliber InsulationTop pick
    4.8 (26 Google reviews)
    38 Claybourne St, Boston, MA 02124
    Call (857) 832-3214WebsiteGoogle reviewsDirections

Together these 3 companies average 4.9★ across 99 reviews. Diamond Dorchester Insulation Inc. has the most reviews (39).

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 Boston

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 BostonNone 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 Boston

In Boston, the average January low is -5°C (23°F), colder than 50% 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 Boston. Many programs require approval or a registered contractor before work starts.

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

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