R M W Exteriors Inc
“The crew was thoughtful, curteous, mindful about going through to find any nails or sharp pieces on the ground so my dogs wouldn't hurt themselves when they came out.”
Best Insulation Contractors in Waterloo, ON
15 contractors listed · 4 in Waterloo · 4 open weekends · 13 rated 4.5+
Data verified October 18, 2026
Reitzel Insulation
“Besides the fact that it's just a better application for insulation since it gets into all the nooks and crannies, but the convenience of having it fully installed and complete in one day really sold us!”
Reuter Roofing
“The crew went above and beyond to correct the issue in a very professional manner.”
Crossroads C & I
“Colleen was a pleasure to deal with!”
Ellus Inc.
“He was always available for discussions regarding the project whenever I needed to talk about any particular issue.”
The Roofman Inc
“After a free consultation, they recommended putting a triangle in the corner so the water would drain away from the house properly.”
The 15 contractors listed for Waterloo, 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: Waterloo, ON
4 of the 15 contractors we list are based in Waterloo; the other 11 serve Waterloo from Kitchener (6 km) and Woolwich (11 km). The contractors on this page are rated from 4.1 to 5.0 across 1,306 reviews; 7 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 (91%), quality (78%) and responsiveness (63%). The topics that come up most in reviews of the contractors on this page are "estimates", "price" and "cleanliness". 4 are open on Saturdays and 1 on Sundays. 1 lists staff certifications (IICRC). 4 have ten or more years of experience, the longest 28 years. 1 offers financing or payment plans; 7 give free estimates; 1 is family- or locally-owned and 2 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 and 9 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 Waterloo?
No. 4 have an address in Waterloo and the rest come from other towns within 15 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.
North Guard Roofing
“Miguel and team were very prompt, thorough and did the work excellently for a fair price.”
Rick Macdonald Siding
“Justin the installer was very skilled and answered any questions we had.”
National Mold Removal
“Top notch service from start to finish, I will recommend him and his company to anyone requiring this type of service.”
LP Platinum Roofing & Exteriors
“We own a couple rental properties in Guelph that needed new roofs and had these guys do them all.”
Enerliv Insulation
“A very reliable company honest and skilled employees and are highly recommended.”
Stevenson Insulation Inc
“The team at Stevenson was very helpful, professional and did an amazing job on my new build and providing much needed insulation to my existing covered porch and extension.”
Berwick Insulation & Roofing
“Amazing family business have had work done since 2014 Recently called about a leak at my newer home.”
Titanium Insulation Inc.
“Jay LeBlanc and his crew did an excellent job with my attic and all the insulation that was needed to be replaced under my roof (cathedral ceilings).”
Strong Foam Insulation
Why these companies made our list
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