Iron Fort Construction & Renovation
“They were quick to come and give a quote and equally as quick to start the job.”
Best General Contractors in Cornwall, ON
23 companies listed · all 23 in Cornwall · 3 open 24/7 · 8 open weekends · 14 rated 4.5+
Data verified October 18, 2026
Millennial Contracting Inc.
“We are very pleased with the end product and wish to thank Matt and his company for having such a high level of professionalism and dedication towards his clients and their projects.”
Cornwall Gravel
“And, they were able to get my load delivered same-day a few hours after my call.”
Nxtgen Construction
“Very friendly, knowledgeable and efficient did a great job with the work that they did for us.”
Clear Pine Contracting Inc.
“I love the quality work and this is now my happy space.”
William Roach Roofing
Listed for homeowners in and around Cornwall, ON, these 23 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: Cornwall, ON
All 23 companies we list here are in Cornwall itself. 18 of the companies on this page have a rating, from 4.0 to 5.0 across 164 reviews; 14 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (89%), quality (89%) and responsiveness (89%). 3 are open around the clock; 8 are open on Saturdays and 6 on Sundays. 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 1997. 3 offer emergency call-outs; 1 offers financing or payment plans; 4 give free estimates and 1 is family- or locally-owned. We have a website on file for 22 of the companies on this page; 18 publish a contact page; 17 list a public email and 1 takes bookings online. 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 quote without charging?
The free estimate promises less on a multi-trade job, and it is advertised by 4 of the 23 companies here. Free normally buys a walk-through and a ballpark figure. A real price takes measuring, trade pricing and desk time, so design-build firms often charge for that stage and credit it against the work if you sign.
Grant Marion Construction
“Overall 10/10 service, would destroy my house again”
Poirier Renovation
“They were efficient, very kind and did a wonderful job that we are incredibly happy with.”
Chester Le Clerc Ltd
Robert Boileau Construction LTD
“I have had 2 Homes built by Robert Boileau Construction LTD, and I have been beyond happy with the services he was able to provide.”
Perras Distefano Construction & Design Services
Desaulniers Construction Ltd
“Very high quality of construction in all aspects!”
Bourgon Construction
Ray-Jans Construction Inc.
Cornwall Renovations JSM Elite
“They walked us through the whole process, helping us pick out materials that look great and won't break the bank.”
Menard Robertson Custom Homes and Renovations Inc.
“Last but not least, they build the estimate and timeline and don't stray from it!”
Little Digger
“We had a small tree in the front yard that holds sentimental value; Little Digger took the time to carefully uproot the tree in order to cause the least amount of damage.”
Ron Chenier & Associates Inc
ICF Innovations
Truecon General Contractors Ltd.
Cornett Renovations
Brad Dumoulin Construction
Sd&g Contracting
“I requested a spring cleanup and was very pleased with their work and price, I wont hesitate to use them again in future”
Why these companies made our list
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