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24 contractors listed · 13 in Thornhill · 9 open 24/7 · 20 open weekends · 19 rated 4.5+
Data verified October 16, 2026
Listed for people planning a new house in and around Thornhill, ON, these 24 contractors build on land you own or on lots they control. A card reflects the way that builder describes its own work, its plans and its service area; the ratings beside it come from public reviews.
13 of the 24 contractors we list are based in Thornhill; the other 11 serve Thornhill from towns including Toronto, North York and Concord. 22 of the contractors on this page have a rating, from 4.0 to 5.0 across 3,829 reviews; 11 have 50 or more reviews and 19 are rated 4.5 or higher. When customers rate these contractors on specific qualities, they most often praise professionalism (95%), quality (86%) and responsiveness (85%). 9 are open around the clock; 20 are open on Saturdays and 16 on Sundays. 10 show a licence on their websites. Domain records put 5 websites of the contractors on this page at ten or more years old; the oldest dates from 2000. 9 offer emergency call-outs; 1 offers financing or payment plans; 13 give free estimates; 3 are family- or locally-owned and 5 list coupons or special offers. We have a website on file for 23 of the contractors on this page; 20 publish a contact page; 18 list a public email and 1 takes 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.
10 of the 24 listings shown show a licence on their websites. For a new house the one to confirm is registration with your provincial new home warranty program, Tarion in Ontario among them. A builder not registered where registration is required is a hard stop, not a detail to sort out later.
