Isolation Equinoxe Plus
“A mold problem due to certain deficiencies in the original insulation of our attic was quickly diagnosed and repaired at a very reasonable price.”
Best Insulation Contractors near Saint-Laurent, QC
None of these contractors is based in Saint-Laurent; they work from towns including Laval (10 km), Saint-Mathieu-de-Beloeil (32 km) and Lasalle (9 km).
10 contractors listed · 3 open weekends · 8 rated 4.5+ · 5 show a licence
Data verified October 18, 2026
Systèmes Sous-Sol Québec
“His expertise and attention to detail was a complete night and day experience compared to the other companies we invited to survey the damages.”
Toiture Union
“Excellent service, respect for the quote, the deadline and a super nice foreman during the work!”
Couvreurs Demos Roofing Inc
“I wanna congratulate the great and friendly staff of couvreurs demos for tjeir competence and professionalism...”
Solution Isolation
“They even vacuumed the exterior at the end of the work so that there were no pieces of blown wool on the floor.”
Isolation Multi-Services
“A professional company and courteous services, very kind representative I recommend **very nice job**”
The 10 contractors listed for Saint-Laurent, 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: Saint-Laurent, QC
The 10 contractors on this page are rated from 4.1 to 5.0 across 1,387 reviews; 5 have 50 or more reviews and 8 are rated 4.5 or higher. When customers rate these contractors on specific qualities, they most often praise professionalism (92%), quality (65%) and responsiveness (63%). 3 are open on Saturdays and 1 on Sundays. 5 show a licence on their websites. 3 have ten or more years of experience, the longest 16 years. 1 gives free estimates. We have a website on file for all 10 of the contractors on this page; 4 publish a contact page and 5 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.
How many listings here have a website?
A website is on file for all 10 contractors here. Look for the materials they install and whether they do attics, basements or both, because plenty of crews specialize in one. Where there is no site, ask the same questions by phone before booking a visit.
Isolation R G C Inc
“When inspecting the work, they did not hesitate to complete any small detail that was not quite to my taste.”
Toitures et Impermeabilisation Trans Canada
“Best roofing service in montreal area!!!”
Uréthane Supérieur de Québec Inc.
“He only charges for what they use.”
Nord-Sud Toitures Inc
“All the work was done in less than a day!”
Why these companies made our list
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