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24 companies listed · 7 in Thornhill · 2 open 24/7 · 9 open weekends · 20 rated 4.5+
Data verified October 18, 2026
Listed for property owners in and around Thornhill, ON, these 24 companies do engineering work for properties. Listings show the disciplines each firm names on its own website, from structural to municipal site work and environmental assessment, with ratings and quotes from public reviews.
Of the 24 companies we list here, 7 are in Thornhill itself and 17 come from towns including Toronto (6), Brampton (2) and Markham (2). 22 of the companies on this page have a rating, from 4.0 to 5.0 across 739 reviews; 3 have 50 or more reviews and 20 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (85%), quality (76%) and responsiveness (74%). The topics that come up most in reviews of the companies on this page are "communication", "efficient" and "price". 2 are open around the clock; 9 are open on Saturdays and 6 on Sundays. The services the companies on this page list most often on their websites are building permits (3), mechanical engineering (3), civil engineering (2), electrical engineering (2) and structural engineering (2). 2 show a licence on their websites. Domain records put 6 websites of the companies on this page at ten or more years old; the oldest dates from 1996. 2 offer emergency call-outs and 2 give free estimates. We count these figures across the companies on this page; hours and prices change, so confirm the details with the company before you book.
Websites are listed for 23 of the 24 firms on this page. Look at project types. A practice geared to municipal infrastructure or industrial plants may not want a beam job, while a small residential structural firm will turn it round faster and cheaper. Say the scope plainly on the first call.
