Best Roofing Contractors in St. Catharines, ON
17 companies listed · all 17 in St. Catharines · 3 open 24/7 · 8 open weekends · all 17 rated 4.5+
Data verified October 21, 2026
AJT Roofing and Contracting
JD Roofing Inc.
Gemini Windows
R&S Roofing and Siding Inc.
Skyway Roofing
Listed for homeowners in and around St. Catharines, ON, these 17 companies take roofing work. What each one claims about tear-offs, membranes and workmanship cover is taken from its own website; ratings and quoted lines come from public reviews.

Area overview: St. Catharines, ON
All 17 companies we list here are in St. Catharines itself. We have 19 companies in St. Catharines on file; this page shows the highest-rated 17. The companies on this page are rated from 4.5 to 5.0 across 666 reviews; 4 have 50 or more reviews. The topics that come up most in reviews of the companies on this page are "price", "estimates" and "quality". 3 are open around the clock; 8 are open on Saturdays and 4 on Sundays. The services the companies on this page list most often on their websites are eavestrough (2), roofing (2) and siding (2). 1 shows a licence on its website and 2 list staff certifications (GAF). 5 have ten or more years of experience, the longest 25 years. 5 offer emergency call-outs; 1 offers financing or payment plans; 9 give free estimates and 4 are family- or locally-owned. We have a website on file for all 17 of the companies on this page; all 17 publish a contact page; 12 list a public email and 3 take bookings online. We count these figures across the companies on this page; hours and prices change, so confirm the details with the company before you book.
Do roofers listed for St. Catharines quote at no charge?
Free estimates are stated by 9 of the 17 companies on this page. A free visit is normal in this trade, though it doubles as a sales call. Ask for photos of the roof and the attic, written findings, and a price that separates the tear-off from anything found under it.