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About Cornerstone Trim Co.
Cornerstone Trim Co. is a specialty interior carpentry shop focused on accent walls, custom trim, and millwork for residential and commercial spaces across the GTA West. Founded in 2018 by Marcus Chen, a third-generation carpenter, our team is dedicated to craftsmanship. We have a four-person crew of journeyman carpenters who ensure tight reveals and clean job sites. We work exclusively with FSC-certified North American hardwoods, including white oak, walnut, and ash. Our process includes free in-home consultations with material samples, 3D renderings, and fixed-price quotes. We manage careful demolition and prep, with installation completed by our own crew. Every project includes a ten-year workmanship guarantee on installation. We serve homeowners, interior designers, and commercial spaces in Burlington, Oakville, Mississauga, and the GTA West.
Our Step-by-Step Process
Consultation
We meet to discuss your vision and bring material samples.
Design Rendering
Our team provides a 3D rendering of your proposed design.
Installation
Our skilled carpenters handle the installation with care.
Final Walkthrough
We ensure your satisfaction with a final walkthrough of the project.
The accent wall transformed our living room completely. The craftsmanship is top-notch.
Cornerstone Trim Co. consistently delivers beautiful, high-quality work for my clients.
Their custom built-ins are functional and stylish. Highly recommend their services.