Top-Rated Insulation Installers in London, ON

9 local companies ranked by 715 Google reviews. Free to compare, no sign-up.

Ratings collected September 2026 · Page updated September 30, 2026

9Companies
715Google reviews
4.8★Average rating
Sep 2026Data collected
Ranked by Google reviewsNever paid forFree to compare

Short answer: The top-rated insulation installers in London are Koala Insulation of London (5.0★, 63 reviews), Net Zero Insulation (4.9★, 161 reviews), Great Northern Insulation (4.7★, 369 reviews).

Insulation installers in London, ranked 9 listed

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  1. 1
    Koala Insulation of LondonTop pickHighest rating (50+ reviews)
    5.0 (63 Google reviews)
    2179 Flying Club Rd, London, ON N5V 3Z9
    Call (226) 774-3802WebsiteGoogle reviewsDirections
  2. 2
    Net Zero InsulationTop pick
    4.9 (161 Google reviews)
    45 Pacific Ct Unit 11, London, ON N5V 3N4
    Call (519) 914-6380WebsiteGoogle reviewsDirections
  3. 3
    Great Northern InsulationTop pickMost reviews
    4.7 (369 Google reviews)
    2485 Innovation Drive, London, ON N6M 0C8
    Call (800) 265-1914WebsiteGoogle reviewsDirectionsEmail [email protected]
  4. 4
    London Spray Foam
    5.0 (13 Google reviews)
    71 Dreaney Ave, London, ON N5Z 1W7
    Call (226) 996-1603WebsiteGoogle reviewsDirections
  5. 5
    Canadian Spray Foam Systems Ltd.
    4.7 (15 Google reviews)
    6746 Wellington Rd S, London, ON N6L 1M5
    Call (519) 933-3710WebsiteGoogle reviewsDirections
  6. 6
    Eco Insulation
    4.6 (57 Google reviews)
    611 Wonderland Rd N #381, London, ON N6H 4V6
    Call (519) 673-6363WebsiteGoogle reviewsDirectionsEmail [email protected]
  7. 7
    S & R Stucco & Insulation
    4.7 (10 Google reviews)
    3657 Woodhull Rd, London, ON N6P 1P2
    Call (519) 701-0141WebsiteGoogle reviewsDirections
  8. 8
    Bay Insulation Systems of Canada ULC
    4.2 (12 Google reviews)
    560 Admiral Ct, London, ON N5V 4L3
    Call (519) 659-9003WebsiteGoogle reviewsDirections
  9. 9
    Polar Energy Systems - Insulation ServicesAlso installs batteries
    4.2 (15 Google reviews)
    79 Bessemer Rd #23, London, ON N6E 1P9
    Call (519) 639-2071WebsiteGoogle reviewsDirectionsEmail [email protected]

Together these 9 companies average 4.8★ across 715 reviews. Great Northern Insulation has the most reviews (369).

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 London

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 Londonup 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 London

In London, the average January low is -8°C, colder than 71% 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 London. 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 London.

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