Capela's Roofing
“Capela's Roofing gave me complete peace of mind throughout the entire process, and I now have the confidence of knowing that one of my biggest investments is protected for many years to come.”
Best Insulation Contractors in Hamilton, ON
15 contractors listed · 11 in Hamilton · 2 open 24/7 · 11 open weekends · 13 rated 4.5+
Data verified October 18, 2026
Sameday Roofing
“We are pleased with the appearance of the new roof and appreciate the photographs documenting the work.”
Gateway Roofing
“We would highly recommend Gateway Roofing to anyone looking for professional service, exceptional workmanship, and a company they can trust.”
Wooly Insulation Inc
“Greg was willing to do the job, gave the quote upfront, arrived when scheduled and completed the job faster than planned.”
Power Vac Services Hamilton & Power Environmental Management
“Had the house's ducts cleaned about a month ago: first off, incredible professionalism of the crew sent to my house; secondly, the difference in interior environment post-cleaning way exceeded my expectations.”
Goldstar Roofing and Siding
“Quick response time from Gold Star and the installer was experienced and professional.”
The 15 contractors listed for Hamilton, 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: Hamilton, ON
11 of the 15 contractors we list are based in Hamilton; the other 4 serve Hamilton from Burlington (9 km). The contractors on this page are rated from 4.3 to 5.0 across 1,990 reviews; 11 have 50 or more reviews and 13 are rated 4.5 or higher. The topics that come up most in reviews of the contractors on this page are "price", "quality" and "cleanliness". 2 are open around the clock; 11 are open on Saturdays and 8 on Sundays. 5 show a licence on their websites and 2 list staff certifications (GAF). Domain records put 5 websites of the contractors on this page at ten or more years old; the oldest dates from 2004. 2 offer emergency call-outs; 2 offer financing or payment plans; 7 give free estimates; 2 are family- or locally-owned and 1 lists coupons or special offers. We have a website on file for all 15 of the contractors on this page; 12 publish a contact page; 12 list a public email and 1 takes 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 7 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.
Gerry's Roofing & Siding Inc
“Everyone we dealt with a Gerry's was professional to deal with from the initial contact right through to the client survey that was conducted with us after all aspects of the work had been done.”
Urban Roofing & Consulting
“It was very easy to get a reasonable quote, and the work was completed swiftly and expertly!”
Di Berardo Insulation
“I appreciate the great communication and professionalism!”
Oblender Insulation Incorporated
Ready Insulation
“Since the attic insulation was installed, the home feels more comfortable and energy efficiency has noticeably improved”
Complete Roofing & Insulation
“I got a second opinion from Complete Roofing & Insulation, and the technician identified a small issue that was quickly repaired.”
Custom Contracting Roofing & Eavestrough Repair
“The guy who came to my house to do the estimate was very professional and experienced and helped us to pick the colour of the replacement siding before he left.”
Silicone Seals Caulking Sealing & Pest Blocking
“Dimitri and Andrei have been helping me around my house with odd jobs (including caulking) and have been doing a great.”
Brunet Exteriors
“The team was incredibly easy to work with from start to finish—communicative, professional, and genuinely committed to doing great work.”
Why these companies made our list
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