Top-Rated Insulation Installers in Oshawa, ON

3 local companies ranked by 167 Google reviews. Free to compare, no sign-up.

Ratings collected September 2026 · Page updated September 30, 2026

3Companies
167Google reviews
4.9★Average rating
Sep 2026Data collected
Ranked by Google reviewsNever paid forFree to compare

Short answer: The top-rated insulation installers in Oshawa are Koala Insulation of Durham (5.0★, 94 reviews), DJM Spray Foam (5.0★, 54 reviews), The Spray Foam Guy Inc. (4.5★, 19 reviews).

Insulation installers in Oshawa, ranked 3 listed

Sort by
  1. 1
    Koala Insulation of DurhamTop pickMost reviews
    5.0 (94 Google reviews)
    1260 Terwillegar Ave Unit 8, Oshawa, ON L1J 7A5
    Call (289) 312-7577WebsiteGoogle reviewsDirections
  2. 2
    DJM Spray FoamTop pick
    5.0 (54 Google reviews)
    729 Fernhill Blvd, Oshawa, ON L1J 5K2
    Call (905) 260-2392WebsiteGoogle reviewsDirections
  3. 3
    The Spray Foam Guy Inc.Top pick
    4.5 (19 Google reviews)
    1100 Skae Dr #1, Oshawa, ON L1J 8H6
    Call (844) 362-6489WebsiteGoogle reviewsDirectionsEmail [email protected]

Together these 3 companies average 4.9★ across 167 reviews. Koala Insulation of Durham has the most reviews (94).

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

Listed here? Get your free top-rated badge for your website.

What a insulation costs in Oshawa

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 Oshawaup to $6,300

That could cut your cost by up to $6,300 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.

Get free quotes from these insulation installers

Pick up to 3 companies and tell them what you want done. We send your request straight to them. Free, no obligation.

Which companies should quote?
What do you want done?

We only share your details with the companies you pick, and never sell them. Privacy policy.

Why insulation matters in Oshawa

In Oshawa, the average January low is -7°C, colder than 70% 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 Oshawa. Many programs require approval or a registered contractor before work starts.

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

See every rebate in Oshawa

Compare top-rated local installers, ranked by Google reviews, and see the rebates you can stack. Free for homeowners.

See Oshawa rebates →
From Sam

Get the monthly rebate update

Once a month: new and changing rebate programs across every province and state we cover, plus what's new in heat pumps, solar and batteries. Short, sourced, no marketing.

No spam, ever. Unsubscribe anytime.

See your rebates and top installers