Renovation Contractor in Oshawa & Durham Region
35+ Years in Construction. Built on Precision, Accountability, and Trust.
Mike's Story
My construction story started in grade five, spending summers with George Mutton at Mutton Masonry — wheeling cement, lifting cinder blocks, forming footings, and pouring concrete. Five years of that work taught me what hard work and pride in craftsmanship actually mean.
At 17, Slip Rowe welcomed me into his woodworking shop and sparked a lifelong passion for the craft. In my late 20s I spent four years on marine interiors — including a bespoke fit-out for Ned Baldwin, the architect of the CN Tower, managing the build across international borders. Working without level surfaces or square angles sharpened my eye and my standards to a level most contractors never reach.
For 16 years I worked in commercial construction — first as Senior Project Manager then National Director of Construction at Weekes General Contracting, delivering turnkey fit-ups for Chipotle, Popeyes, A&W, and Cinnabon, and managing relationships with Cadillac Fairview, Ivanhoe Cambridge, and Oxford Properties. In 2017 I founded Cornerstone Construction to bring that same commercial discipline directly to homeowners. We treat your home like a commercial contract.
35+ Years Experience
From masonry foundations to national commercial operations
Commercial Standards
Built systems for global brands. Now we bring that discipline to your home.
Licensed & Insured
Ontario corporation, fully covered, no shortcuts.
Local Expertise
Deep roots in the community with a reputation built on trust and quality.
Why I Do This
I started Cornerstone because I saw homeowners getting let down — by vague quotes, missed timelines, and contractors who disappeared after the deposit.
— Mike Brock, Founder
Mike Brock began his journey in the trades, learning that a home is only as strong as the integrity of the person building it. These early years formed the bedrock of his commitment to quality craftsmanship.

With over 15 years of experience, Mike expanded into complex residential and commercial projects, refining a process that prioritises clear communication and meticulous attention to detail.

Seeing homeowners frustrated by unreliable contractors, Mike founded Cornerstone. The mission was simple: provide honest quotes, stick to timelines, and never disappear after a deposit.

Today, Cornerstone stands as a premier partner for residential and commercial renovation. We listen, we build, and we deliver on every promise made to our community.

Get Started
Every project starts with a conversation. Book your free project diagnostic or call Mike directly.
Durham Region's trusted renovation contractor. Led by Mike Brock since 2017. We Listen, We Build, We Deliver.