Bros. Roofing
“He was true to his initial quote, and went above and beyond to ensure the repair was of better quality than the pre-existing condition”
Best Insulation Contractors in Markham, ON
15 contractors listed · 6 in Markham · 1 open 24/7 · 12 open weekends · all 15 rated 4.5+
Data verified October 18, 2026
Pro Insulation Contracting
“With a tight schedule, Pro Insulation was able to send someone the next day for a quote and complete the work by following week (old insulation removal and spray insulation).”
Confirmed Attics & Insulation
“Moe and his team were so delightful to work with throughout the process of getting our carpets removed and then replaced with vinyl flooring.”
Exalted Services
“Took his time installing my new AC & explained things so that I could understand, he did an amazing job, no mess left behind.”
Celluloseman
“The mould remediation took two days and they made sure to keep everything contained.”
Toprenosolutions Inc.
“It was a 2 day job and the workers were very professional, prompt, polite, clean and detailed in their work and respectful of our living space.”
The 15 contractors listed for Markham, ON 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: Markham, ON
6 of the 15 contractors we list are based in Markham; the other 9 serve Markham from towns including North York (15 km), Scarborough (15 km) and Richmond Hill (14 km). The contractors on this page are rated from 4.7 to 5.0 across 1,962 reviews; 13 have 50 or more reviews. When customers rate these contractors on specific qualities, they most often praise professionalism (87%), value (87%) and quality (84%). The topics that come up most in reviews of the contractors on this page are "cleanliness", "estimates" and "efficient". 1 is open around the clock; 12 are open on Saturdays and 7 on Sundays. 5 have ten or more years of experience, the longest 25 years. 2 offer emergency call-outs; 1 offers financing or payment plans; 11 give free estimates and 3 list coupons or special offers. We have a website on file for all 15 of the contractors on this page; all 15 publish a contact page; all 15 list a public email and 4 take bookings online. 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.
Will anyone assess the house at no charge?
No charge assessments are advertised by 11 of the 15 contractors on this page. Treat that as a sales visit with a tape measure. A paid energy evaluation is the thorough version, and in some provinces it is also the paperwork that opens the door to a rebate program.
White & Greer Co Ltd
“Excellent to deal with - The true pros”
AZ Roofing
“His prices were very reasonable, and where some would have tried to convince us to replace the whole roof, he did not, stating he wanted to save us money.”
NDS Insulation Inc.
“Everything went well with the attic insulation from initial visit by Luca, insulation by Riffat and Nick and pre and post audits.”
Integrity Roofers
“Shay and his crew were courteous, efficient and they have been there to answer any questions we had.”
Sprayfoam Solutions Toronto Inc
“Very reliable and delivered the job on time and passed the inspection on the first try.”
Guycan Ltd
“If you're looking for a new roof for your building, I would definitely recommend getting a quote from this company.”
Space Insulation
“Great job guys thanks for the work I am so happy with you work”
Stable Roofing Inc
“Ivan ( Stable Roofing ) did my roof and my sister's and we are 100% satisfied with his work.”
Konstruction Group Inc.
“He provided framing suggestions that ended up saving money by using less materials than the engineer called for.”
Why these companies made our list
Is this page useful? Yes
No
Is there anything wrong with this page?
