Best Siding Contractors in Newmarket, ON
15 companies listed · 7 in Newmarket · 1 open 24/7 · 11 open weekends · 14 rated 4.5+
Data verified October 21, 2026
T. Simpson Roofing
Ontario Certified Roofing
First Choice Roofing
Benjamin Moore
Gamma Roofing
Listed for homeowners in and around Newmarket, ON, these 15 companies work on exterior walls. Details about materials, colour ranges and insulation options are drawn from each company's own site, and the review quotes underneath are public reviews.

Area overview: Newmarket, ON
7 of the 15 companies we list are based in Newmarket; the other 8 serve Newmarket from towns including Richmond Hill (21 km), East Gwillimbury (10 km) and Bradford (11 km). The companies on this page are rated from 3.7 to 5.0 across 782 reviews; 7 have 50 or more reviews and 14 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (93%), quality (83%) and responsiveness (80%). The topics that come up most in reviews of the companies on this page are "estimates", "price" and "cleanliness". 1 is open around the clock; 11 are open on Saturdays and 8 on Sundays. The services the companies on this page list most often on their websites are skylights (4), doors (2), eavestroughs (2), metal roofing (2) and residential roofing (2). 1 shows a licence on its website and 1 lists staff certifications (GAF). 5 have ten or more years of experience, the longest 24 years. 1 offers emergency call-outs; 4 offer financing or payment plans; 9 give free estimates and 5 are family- or locally-owned. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book.
How many of these companies publish a website?
Websites are listed for all 15 companies on this page. Open them and look for finished houses nearby, ideally after a winter or two rather than on handover day. Close-up photographs around windows and at corners show the standard of the trim work, which is where a rushed job gives itself away first.