Toitures Joël
“The whole family (mother, daughter, son and friends) took your company for the roofing work and everyone is satisfied!”
Best Insulation Contractors in L'Assomption, QC
15 contractors listed · 4 in L'Assomption · 3 open weekends · 13 rated 4.5+ · 7 show a licence
Data verified October 18, 2026
Isolation Maximum Inc.
“Excellent service, hard to ask for better.”
ISO Energie Inc
“A great team that is professional and fast!”
Isolation Val-Mers Ltee
Confort Prestige
“Very satisfied with the work that was carried out at my home, professional service from our representative Jonathan and the installers.”
Isolation Majeau et Frère (Bureau Chef)
“Super nice and professional guys, they are at your place the day and time they tell us.”
The 15 contractors listed for L'Assomption, QC insulate attics, basements, headers and crawl spaces. Details under each one about materials, hours and advertised services are copied from the company's own site; star ratings and comments come from public reviews.
Area overview: L'Assomption, QC
4 of the 15 contractors we list are based in L'Assomption; the other 11 serve L'Assomption from towns including Terrebonne (22 km), Repentigny (12 km) and Mascouche (17 km). The contractors on this page are rated from 4.0 to 5.0 across 651 reviews; 5 have 50 or more reviews and 13 are rated 4.5 or higher. When customers rate these contractors on specific qualities, they most often praise professionalism (90%), quality (63%) and value (60%). 3 are open on Saturdays and 1 on Sundays. 7 show a licence on their websites. Domain records put 8 websites of the contractors on this page at ten or more years old; the oldest dates from 2010. 1 lists coupons or special offers. We have a website on file for all 15 of the contractors on this page; 10 publish a contact page and 10 list a public email. We count these figures across the contractors on this page; distances are straight-line, and hours and prices change, so confirm the details with the contractor before you book.
Are all of these firms based in L'Assomption?
No. 4 have an address in L'Assomption and the rest come from other towns within 25 km. Rig and hose mean these crews cover a wide area from one yard. Ask whether your address falls inside the zone they work without a surcharge.
Ecorenov
“Throughout the process, we were very satisfied with her professionalism, her availability and the follow-up she carried out with us.”
Les Toitures Martin Lafleur Inc.
“Also the installers where professionals and they kept nothing behind, eveything was cleaned up.”
Calfeutrage Premium
“They took the time to make a good diagnosis and explain the options and solutions to me with simplicity and respect.”
A1 Isolation
“Yves also pointed out an important misalignment of a fan vent that wasn't leading outside which would help us avoid issues in the future.”
Isolation Marcel Bouchard Inc.
Les Enterprises Norbé Inc
Isolation Grenier & Fils Inc
“We have had a good professional relationship with Isolation Grenier for several years.”
Finition Acrylique Rive-Nord
“Thank you for your professionalism 👌🏆”
Confort Isolation Ltee
“The best in Canada for a job well done”
Why these companies made our list
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