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None of these contractors is based in Thornhill; they work from towns including Toronto, Mississauga and North York.
24 contractors listed · 1 open 24/7 · 5 open weekends · 18 rated 4.5+
Data verified October 21, 2026
The 24 contractors listed for Thornhill, ON design and install rooftop and ground mounted solar systems. Each entry repeats what the company publishes about certifications, equipment and hours, together with star ratings and comments drawn from public reviews.
21 of the 24 contractors on this page have a rating, from 3.9 to 5.0 across 536 reviews; 2 have 50 or more reviews and 18 are rated 4.5 or higher. When customers rate these contractors on specific qualities, they most often praise professionalism (95%), quality (71%) and responsiveness (71%). The topics that come up most in reviews of the contractors on this page are "price" and "estimates". 1 is open around the clock; 5 are open on Saturdays and 1 on Sundays. Domain records put 11 websites of the contractors on this page at ten or more years old; the oldest dates from 1997. 1 offers emergency call-outs; 3 offer financing or payment plans; 7 give free estimates; 2 are family- or locally-owned and 5 list coupons or special offers. We have a website on file for all 24 of the contractors on this page; 22 publish a contact page; 22 list a public email and 4 take bookings online. We count these figures across the contractors on this page; hours and prices change, so confirm the details with the contractor before you book.
Weekend hours appear for 5 of the 24 contractors here, and a Saturday survey is easier for most households to arrange. Keep in mind that a useful roof survey needs daylight and a roof clear of snow and ice, which narrows the window in winter more than the calendar does.
