Top-Rated Insulation Installers in Markham, ON

4 local companies ranked by 1,247 Google reviews. Free to compare, no sign-up.

Ratings collected September 2026 · Page updated September 30, 2026

4Companies
1,247Google reviews
4.9★Average rating
Sep 2026Data collected
Ranked by Google reviewsNever paid forFree to compare

Short answer: The top-rated insulation installers in Markham are Confirmed Attics & Insulation (5.0★, 365 reviews), Pro Insulation Contracting - Spray Foam & Attic Insulation (4.9★, 180 reviews), Super Green Energy Saving Inc. (4.9★, 97 reviews).

Insulation installers in Markham, ranked 4 listed

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  1. 1
    Confirmed Attics & InsulationTop pickHighest rating (50+ reviews)
    5.0 (365 Google reviews)
    2600 John St. #208, Markham, ON L3R 3W3
    Call (647) 507-4072WebsiteGoogle reviewsDirectionsEmail [email protected]
  2. 2
    Pro Insulation Contracting - Spray Foam & Attic InsulationTop pick
    4.9 (180 Google reviews)
    185 Riviera Dr Unit 11, Markham, ON L3R 5M1
    Call (416) 315-0471WebsiteGoogle reviewsDirectionsEmail [email protected]
  3. 3
    Super Green Energy Saving Inc.Top pick
    4.9 (97 Google reviews)
    195 Clayton Dr, Markham, ON unit 5&6
    Call (647) 654-9188WebsiteGoogle reviewsDirectionsEmail [email protected]
  4. 4
    Constant Home ComfortMost reviewsAlso installs solar
    4.8 (605 Google reviews)
    201 Don Park Rd Unit 2, Markham, ON L3R 1C2
    Call (888) 829-1875WebsiteGoogle reviewsProfileDirectionsEmail [email protected]

Together these 4 companies average 4.9★ across 1,247 reviews. Constant Home Comfort has the most reviews (605).

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 Markham

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 Markhamup 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.

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Why insulation matters in Markham

In Markham, the average January low is -8°C, colder than 77% 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 Markham. 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 Markham.

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