Top-Rated Insulation Installers in Fremont, CA

5 local companies ranked by 177 Google reviews. Free to compare, no sign-up.

Ratings collected September 2026 · Page updated September 30, 2026

5Companies
177Google reviews
5.0★Average rating
Sep 2026Data collected
Ranked by Google reviewsNever paid forFree to compare

Short answer: The top-rated insulation installers in Fremont are Attic Bros of Fremont (5.0★, 43 reviews), Regal Insulation Services (5.0★, 31 reviews), Attics Express (4.9★, 45 reviews).

Insulation installers in Fremont, ranked 5 listed

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  1. 1
    Attic Bros of FremontTop pick
    5.0 (43 Google reviews)
    39355 California St Ste 201A, Fremont, CA 94538
    Call (510) 413-3531Google reviewsDirections
  2. 2
    Regal Insulation ServicesTop pick
    5.0 (31 Google reviews)
    37364 Niles Blvd, Fremont, CA 94536
    Call (510) 983-5455WebsiteGoogle reviewsDirections
  3. 3
    Attics ExpressTop pickMost reviews
    4.9 (45 Google reviews)
    44837 Fremont Blvd, Fremont, CA 94538
    Call (408) 561-1909WebsiteGoogle reviewsDirections
  4. 4
    Attic Repair Guys
    5.0 (24 Google reviews)
    3051 Quantum Dr #2411, Fremont, CA 94538
    Call (415) 737-9844WebsiteGoogle reviewsDirections
  5. 5
    All State Insulation
    4.9 (34 Google reviews)
    4510 Peralta Blvd Suit 23, Fremont, CA 94536
    Call (209) 569-6261WebsiteGoogle reviewsDirectionsEmail [email protected]

Together these 5 companies average 5.0★ across 177 reviews. Attics Express has the most reviews (45).

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 Fremont

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.

Insulation rebates open in Fremontup to $1,600

That could cut your cost by up to $1,600 if you qualify. Most rebates have rules (income, your current heating, a registered contractor, approval before work starts).

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

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Why insulation matters in Fremont

In Fremont, the average January low is 7°C (44°F), colder than 9% of the 123 cities we track. Winters here are mild, so comfort and summer heat matter as much as heating bills. Air sealing and attic insulation still help most, and they also keep upstairs rooms cooler in summer.

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 Fremont. 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 Fremont.

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