Iron Fort Construction & Renovation
“They were also very good and pointing out other issues with the house and asking what we wanted to do about them.”
Best Bathroom Renovation Contractors in Cornwall, ON
10 companies listed · 5 in Cornwall · 2 open 24/7 · 2 open weekends · 9 rated 4.5+
Data verified October 17, 2026
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Sheridan Interiors
“Hiring a professional designer like Anne-Marie was definitely worth it, as she brings years of experience and access to a much wider variety of products than we could otherwise find.”
Seaway Bath Renovators
“Recently had our bathroom redone and wish to extend our gratitude to Larry and Jake for making this such a great experience.”
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.”
Artisan Kitchen and Bath
“Fantastic design team, high quality products installed with great care on time as promised.”
Santoro Renovation
“They worked with us to find an appropriate solution and stayed within our budget.”
Listed for homeowners in and around Cornwall, ON, these 10 companies remodel bathrooms, including basement bathrooms and the venting problems that come with them. Each card repeats what the company says about itself on its own site, and the reviews underneath it were left by customers.
Area overview: Cornwall, ON
5 of the 10 companies we list are based in Cornwall; the other 5 serve Cornwall from towns including Alexandria (36 km), Embrun (50 km) and Coteau-du-Lac, QC (52 km). The companies on this page are rated from 4.3 to 5.0 across 97 reviews; 9 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (81%), quality (69%) and responsiveness (66%). 2 are open around the clock and 2 are open on weekends. 1 shows a licence on its website. 2 have ten or more years of experience, the longest 21 years. 2 offer emergency call-outs; 1 gives free estimates and 1 is family- or locally-owned. We have a website on file for 9 of the companies on this page; 8 publish a contact page and 7 list a public email. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book.
How much can I tell from these companies' websites?
A website is linked from 9 of the 10 listings here. Look past the finished photos for pictures taken mid-job: membrane on the walls, blocking between studs, an insulated duct heading outdoors. A company that photographs the parts nobody sees is telling you what it cares about.
Construction Pro-Énergie
“Very professional, kind and honest contractor.”
Mo & Ammar Reno
“Their expertise was evident in the meticulous attention to detail they applied to the drywall installation and finishing, resulting in a flawless final product.”
Keystone Contracting & Millwork
“Beautiful work, excellent craftsmanship; I wish I had my entire home built by Keystone!”
Lefebvre Roch Enrg
Why these companies made our list
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