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24 companies listed · 8 in Thornhill · 4 open 24/7 · 14 open weekends · 21 rated 4.5+
Data verified October 18, 2026
Listed for homeowners in and around Thornhill, ON, these 24 companies build and rebuild retaining walls. Wall types, materials and seasonal hours are what each company publishes for itself, and the ratings and quoted lines are drawn from public reviews.
Of the 24 companies we list here, 8 are in Thornhill itself and 16 come from towns including Vaughan (3), Etobicoke (2) and Scarborough (2). 23 of the companies on this page have a rating, from 4.2 to 5.0 across 1,863 reviews; 16 have 50 or more reviews and 21 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (94%), quality (87%) and responsiveness (81%). 4 are open around the clock; 13 are open on Saturdays and 8 on Sundays. The services the companies on this page list most often on their websites are retaining walls (3), tree removal (3), arborist reports (2), basement finishing (2) and basement renovations (2). 7 show a licence on their websites and 2 list staff certifications (ISA). Domain records put 5 websites of the companies on this page at ten or more years old; the oldest dates from 2003. 4 offer emergency call-outs; 2 offer financing or payment plans; 17 give free estimates; 3 are family- or locally-owned and 1 lists coupons or special offers. We count these figures across the companies on this page; hours and prices change, so confirm the details with the company before you book.
A website link sits on 23 of the 24 wall builders here. A photograph of a finished wall tells you very little, because everything that fails is behind the face. Look for pictures taken mid-build instead: the base trench, the drainage stone going in, the grid rolled out between courses. Ask to see a wall that has been standing through several winters.
