Durham Region's Premier Builder
Residential Renovations Done Right
From kitchens to basements, Cornerstone Construction delivers professional renovations for homeowners across Oshawa, Whitby, Bowmanville, Ajax, Pickering, and Durham Region. Licensed, insured, and backed by our 8-point Certainty Stack.
What We Build
Every service includes the full Cornerstone standard — white glove service, daily cleanup, price lock guarantee, and a 5-year warranty.
Kitchen Renovations
Custom and pre-built cabinetry, countertops, flooring, pot lights, plumbing, and electrical. We build kitchens that work as hard as you do. Starting from $25,000.
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Bathroom Renovations
Full gut and rebuild, ensuite upgrades, powder rooms, heated floors, glass showers, and custom tile work. Starting from $15,000.
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Basement Finishing
Family rooms, home offices, legal apartments, and guest suites. We finish basements that add real living space and real value. Starting from $40,000.
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General Contracting
Have a project that doesn't fit one category? From one-week flooring and wall-removal jobs to multi-month builds, we manage the full scope from design to handover. One point of contact. One contract. No surprises.
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Main Floor & Whole Home
Multi-room and full-home renovations done as one coordinated project — kitchen, baths, flooring, and finishes rebuilt to a single standard. One team, one contract, one timeline.
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Additions & Garages
Square-footage additions, second storeys, garages, and in-law suites. We extend your home without compromising structure, code, or the look of the original build.
Learn MoreWhy Cornerstone
Why Durham Region Homeowners Choose Cornerstone
We built this company on one belief — homeowners deserve a contractor they can actually trust.
We Show Up
Mike Brock or a named supervisor is on your job every single day. You always know who is in charge and how to reach them.
We Lock Your Price
Your quote is your price. No surprise invoices. No change orders without your written approval.
We Back Our Work
Every renovation is covered by our 5-year workmanship warranty and a full Owner's Manual at handover.
What Our Clients Say
Real Results. Real Clients.
Experience the Cornerstone difference through the words of homeowners we have served across Durham Region.
"Mike was the most professional and punctual contractor I have ever worked with. He understood how to bring my 10-year vision into reality. If it is not straight then it is not correct. He will make sure that it is. He will now be the only contractor to touch any part of my house."
Recent Projects
See This Work in Homes Across Durham Region
Real Cornerstone projects from start to finish — full scope, materials, and the problems we solved along the way.
The Cornerstone Way
We Listen, We Build, We Deliver
Three phases. One team. One contract. No surprises.
We Listen
Before we touch a single wall we sit down with you. We learn how you use the space, what matters most, and what your budget can do. Then we build a plan around that.
We Build
Every trade on your job is vetted and held to our standards. Level 4 drywall. Daily cleanup. HEPA filtration. We build like it is our own home.
We Deliver
Your price is locked. Your timeline is committed. And when we hand the keys back you get a 5-year warranty and a full Owner's Manual. That is the Cornerstone standard.
Common Questions
Frequently Asked Questions
What areas do you serve?
We serve Oshawa, Whitby, Bowmanville, Clarington, Ajax, Pickering, Newcastle, Scarborough, Stouffville, and Peterborough.
How long does a kitchen renovation take?
Most kitchens take 3 to 8 weeks depending on the scope of work. We give you a detailed timeline before we start and hold to it. Our $300 per day on-time penalty means we are accountable if we run late.
Do you use custom or pre-built cabinets?
Both. We work with custom and pre-built cabinetry depending on your budget and goals. We walk you through the options at your consultation.
Do you provide a warranty?
Yes. Every renovation is backed by a 5-year workmanship warranty and a full Owner's Manual at handover.
How do I get started?
Click Start Your Project Diagnostic, fill out the short form, and Mike will be in touch within 24 hours.
Do you pull permits?
When your project requires a permit we handle the entire process and tell you upfront what is needed and why.
Ready to Build Your Vision with Cornerstone?
From Durham Region to the GTA, Mike Brock and our team deliver excellence. Book your free project diagnostic and get a fixed price before we start.
