Colin's Roofing & Eavestrough
“What looked like a simple job was quite complex and Colin resolved all of the challenging issues and finished with an amazing job.”
Best General Contractors in Oshawa, ON
23 companies listed · all 23 in Oshawa · 4 open 24/7 · 17 open weekends · 20 rated 4.5+
Data verified October 21, 2026
Walton Restoration
“Innovative and trendsetting with their use of advanced technology in detecting sources of damage - along with future damage.”
Fice Multi Trade Inc. Oshawa Painter
“Shannon and her family were recommended to you us and we could not be any happier with their work.”
Bradshaw Builds
“They have a keen eye for detail and quality, and they always go above & beyond to make sure their clients are happy with the results.”
Aztec Decks
“Dustin was easy to communicate with via email and in person, he sent several designs, and revised those designs based on our feedback and budget.”
Lofthouse Construction Inc.
“His professionalism, speed, and perfectionism is what made us come back to ask him to help with some much needed updates once we purchased our forever home.”
Listed for homeowners in and around Oshawa, 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: Oshawa, ON
All 23 companies we list here are in Oshawa itself. We have 50 companies in Oshawa on file; this page shows the highest-rated 23. The companies on this page are rated from 4.0 to 5.0 across 424 reviews; 1 has 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 (96%), quality (88%) and responsiveness (82%). The topics that come up most in reviews of the companies on this page are "price" and "estimates". 4 are open around the clock; 17 are open on Saturdays and 11 on Sundays. The services the companies on this page list most often on their websites are basements (2), bathrooms (2), design (2), flooring (2) and interior renovations (2). 2 show a licence on their websites. 3 have ten or more years of experience, the longest 18 years. 4 offer emergency call-outs; 1 offers financing or payment plans; 11 give free estimates; 1 is 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.
Do any of these companies say they are licensed?
2 of the 23 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.
Pristine Contracting Inc.
“When Anthony first came over, he was very helpful in suggesting the layout and different things we should do as we are first time home owners.”
Hutchuk's Construction (Hutcon)
“Derek did a great job removing brush and trees from my property.”
Absolute Renos
“Scott was very professional and patient, my mother and I were very picky and changed our minds many times on the style and the finish but they were highly patient with us, while also providing us with many different options.”
Accl Waterproofing
“Service was extremely professional and my basement is dry!”
Mark's Cutting Edge Painting & Finishing
“He provided us with outstanding customer service before, during and after the job was done (he even came by to touch up a couple spots I knicked by accident a few weeks after he had finished, no cost).”
Ramsauer Reno.
“We felt comfortable approaching them with any questions and concerns and never felt anxious about having them in our house unsupervised while we were at work.”
The Adylan Company
“Would definitely use this company again and recommend to anyone.”
Ashley Designers
“Their ability to blend aesthetics with functionality is remarkable.”
Ashrafi Home Renovation
“Ashrafi was prompt, professional and efficient in installing pipes for new laundry and powder rooms.”
Durham Basement Finishing & Legalization
SKL Group Home Renovations
“We are so happy with the workmanship of our privacy fence and new costum gate🥰Highly recommended 💪 …”
Quality Woodworks
“Andrew was responsive and helped with some post installation maintenance work as well.”
Homes Reno
“They are very professional and one of the teams you can trust their word.”
Baran Jones
“We recently bought an older home which required major renovations, and we feel very fortunate to have hired Neil Jones and his team, to do all the extensive reno work”
Real Deal Contracting Inc
“He communicated well with the condo staff and I to get the work done on time and shared his expertise, which I really appreciated.”
Grandview Design & Build
“The first project got the unit sold in one day and they recently completed a fantastic renovation on our new home.”
Elite Star General Contracting Ltd
“They were on time and cleaned up after themselves and the garage was deposed of in a timely manner.”
Why these companies made our list
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