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None of these contractors is based in Alliston; they work from towns including Barrie (29 km), Richmond Hill (47 km) and Newmarket (34 km).
24 contractors listed · 7 open 24/7 · 15 open weekends · 20 rated 4.5+ · 2 show a licence
Data verified October 18, 2026
The 24 contractors listed for Alliston, 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.
23 of the 24 contractors on this page have a rating, from 4.0 to 5.0 across 2,111 reviews; 15 have 50 or more reviews and 20 are rated 4.5 or higher. When customers rate these contractors on specific qualities, they most often praise professionalism (94%), quality (82%) and responsiveness (77%). The topics that come up most in reviews of the contractors on this page are "estimates", "price" and "cleanliness". 7 are open around the clock; 15 are open on Saturdays and 12 on Sundays. The services the contractors on this page list most often on their websites are siding (5), skylights (5), roof repair (3), soffit & fascia (3) and attic insulation (2). 2 show a licence on their websites. 7 have ten or more years of experience, the longest 19 years. 7 offer emergency call-outs; 4 offer financing or payment plans; 13 give free estimates; 5 are family- or locally-owned and 2 list coupons or special offers. We have a website on file for all 24 of the contractors on this page; all 24 publish a contact page; 18 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.
A website is on file for all 24 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.
