Top-Rated Insulation Installers in Oshawa, ON
3 local companies ranked by 167 Google reviews. Free to compare, no sign-up.
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
- 5.0 (94 Google reviews)1260 Terwillegar Ave Unit 8, Oshawa, ON L1J 7A5
- 5.0 (54 Google reviews)729 Fernhill Blvd, Oshawa, ON L1J 5K2
- 4.5 (19 Google reviews)1100 Skae Dr #1, Oshawa, ON L1J 8H6
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 not paid for. How we rank and how we make money.
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What a insulation costs in Oshawa
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.
That could cut your cost by up to $7,700 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.
Talk to a registered energy advisor first. Some rebates need an evaluation or heat load calculation before any work starts. See the top-rated registered energy advisors in Oshawa. Read when to call an energy advisor.
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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 an insulation installer
- Ask whether they will air-seal before insulating, and what they will seal (attic hatch, pot lights, pipes, top plates).
- Ask for the R-value before and after for each area, and the material and depth they will install.
- Ask whether your rebate needs an energy assessment before and after the work, and who books it.
- Ask how they handle ventilation and any old insulation that could contain vermiculite (asbestos risk).
Questions about insulation installers in Oshawa
Who is the best insulation installer in Oshawa?
Based on Google reviews, 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). We rank by a review-weighted score, so companies with many strong reviews rank above those with only a few.
How are the insulation installers in Oshawa ranked?
We list 3 insulation companies in Oshawa, ranked by Google rating weighted by review count. Together they have 167 Google reviews and average 4.9 stars, collected September 2026. Koala Insulation of Durham has the most reviews (94). No company pays to be listed or ranked.
How much does insulation cost in Oshawa?
Insulation prices depend 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.
Are there rebates for insulation in Oshawa?
Yes. Our verified program data shows insulation rebates up to $7,700 open in Oshawa. Most rebates have rules, such as income, your current heating, a registered contractor, or approval before work starts, so check the rebate page before you sign.
Is insulation worth it 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.
What should I ask an insulation installer before I hire?
Ask whether they will air-seal before insulating, and what they will seal (attic hatch, pot lights, pipes, top plates). Ask for the R-value before and after for each area, and the material and depth they will install. Ask whether your rebate needs an energy assessment before and after the work, and who books it.
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, energy advisors in Oshawa.
How to read these results
- Open the profile.How a installer describes its own work tells you a lot. Look for jobs like yours.
- Read the Google reviews.Stars and counts come from Google Maps. Click through and read what past customers wrote, good and bad.
- Check for program badges.A green registered-contractor badge means the company is on the program's own list, which some rebates require.
- Compare three.Do not stop at the first good installer. Three quotes show you the real range in price, equipment and plan.
Not ready to talk to a contractor yet?
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