Danar Co. GTA
“I've been using Danar for the past 10 years on various home renovation projects and they never let me down.”
Best General Contractors in Thornhill, ON
24 companies listed · all 24 in Thornhill · 14 open weekends · 20 rated 4.5+ · 4 show a licence
Data verified October 19, 2026
Darvish Inc
“The gentleman did my Interior railing , i cant remember his name but A big shout out to him for his Patience and Job well done.”
𝑷&𝑶 𝑮𝒆𝒏𝒆𝒓𝒂𝒍 𝑪𝒐𝒏𝒔𝒕𝒓𝒖𝒄𝒕𝒊𝒐𝒏 𝑰𝒏𝒄
“Dealing with their team was a great experience and all their trades were very respectful and provided great quality workmanship.”
ADH Canada Inc.
“If you're looking for a construction company that delivers outstanding results and an exceptional customer experience, look no further than "ADH CANADA INC.”
Arcon Landscape Construction Ltd
“Acron Landscape Construction just redone the driveway and backyard of my house.”
Luar Contracting
“We highly recommend this company and will be using it in the future again.”
Listed for homeowners in and around Thornhill, ON, these 24 companies take on multi-trade work, from a basement build-out to a full renovation. What each one says about licensing, hours and the work it takes on comes from its own website; ratings and quotes come from public reviews.
Area overview: Thornhill, ON
All 24 companies we list here are in Thornhill itself. We have 34 companies in Thornhill on file; this page shows the highest-rated 24. 23 of the companies on this page have a rating, from 4.0 to 5.0 across 387 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 (97%), quality (81%) and responsiveness (78%). The topics that come up most in reviews of the companies on this page are "communication", "price" and "estimates". 13 are open on Saturdays and 5 on Sundays. The services the companies on this page list most often on their websites are basement renovations (2), bathroom renovations (2), condo renovations (2), home renovation (2) and kitchen renovations (2). 4 show a licence on their websites. 5 have ten or more years of experience, the longest 29 years. 1 offers financing or payment plans; 10 give free estimates and 1 lists coupons or special offers. We have a website on file for 22 of the companies on this page; 21 publish a contact page and 21 list a public email. 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 any of these companies say they are licensed?
4 of the 24 listings on this page show a licence on their websites. Verify the claim with the issuing body. Then ask separately for a WSIB or provincial WCB clearance letter, which is the document that keeps a workplace injury on your property from becoming your bill.
Shemiran Construction LTD
“I have had two renovation projects with this company and they did an excellent job in a short period of time for a reasonable price!”
Artycon
“It's not easy to find a contractor who not only delivers but also makes the entire process stress-free.”
TJI Renovation
“They helped us put our vision for the space to reality and we're happy with our finished basement.”
York Building Materials Inc.
“I have been working with many contractors, but Behrouz and his team are incredible - timely but also fairly priced!”
Emian Construction Group
“Mehdi's team proved to be knowledgeable, tidy, and, most importantly, they met the deadline, allowing us to host my partner's family when they came to visit.”
Arco Construction Co
“They built our dream home back in 2015 and have been managing our property ever since.”
Generational Homes
“Just in 2 weeks, I got my remodeling done for my house, thanks Natan!”
Solarium Service Ltd.
“Dean and Paul were always professional and did an amazing job (and they are great guys too!”
Hrc Group
“There aren't enough words to praise Shaw and his team for their construction of a new wood fence in our back yard and the repair of a broken wood gate.”
KG Building Restoration Inc.
“They attention always for quality, We have done so many projects for this company, The payments always have been on time,”
Level Structure Inc.
“They did our back yard fence installation in a timely manner and they were true professionals.”
Renowell
“Even their post-renovation service was exceptional, showcasing their genuine care for their clients.”
Decor Plus Renovation
Al-D Home Improvement Solutions
“I highly recommend him and his services, especially for kitchen and bathroom designs and work.”
Black & McDonald
“Greg was hands down one of the most personable & quality installers I've had who went over & above to ensure the installation would best fit my needs.”
Albacon Construction
Lulu Construction and Demolition
“I'm thrilled with the results and couldn't recommend them enough to anyone looking for top-notch construction work.”
Heritage Concrete Pumping Limited
“The most professional concrete pumping company we have worked with.”
Why these companies made our list
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