Cornerstone Construction

General Contractor, Waterproofing, Drywall Installation & Repair

804 Ritson Road South rear unit, Oshawa, ON L1H 5L4

About Cornerstone Construction

Cornerstone Construction is dedicated to turning client visions into reality through exceptional craftsmanship and service. Clients have praised the company's attention to detail, professionalism, and quality of workmanship. A recent large renovation project in the Durham region showcased the team's commitment, with a focus on communication and collaboration throughout the process. Mike, a key member of the team, is noted for spending all his time on projects, making it easy for clients to stay involved and informed. His knowledge and guidance have been particularly helpful, providing clients with templates and ideas for their renovations. Additionally, the company is recognized for handling projects like garage ceiling repairs with expertise and thoroughness. Overall, clients have expressed satisfaction with their experiences, highlighting the strong work ethic and dedication to delivering quality results at Cornerstone Construction.

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Reviews for Cornerstone Construction

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  • Jun 2026

    Currently am undergoing an insurance claim to get home restoration completed and reached out to Mike at Cornerstone Construction to assess and provide a complete proposal for the scope of work. Mike has been fantastic to work and communciate with. He is extremely detailed and meticulous. Proposal provided in-depth itemized line items for every restoration task. Everything was black and white with no room for confusion. Mike also has been instrumental in helping negotiate with the insurance company. He knows all the construction codes and laws in detail and was able to assess my insurance policy too and suggest justifiable factual counter arguments for the insurance company...read full review

  • Dec 2025

    We had a great experience working with this general contractor from start to finish. Communication was clear, timelines were respected, and the quality of work exceeded our expectations. Every detail was handled professionally, and any questions we had were addressed quickly. It’s rare to find someone this reliable and skilled—highly recommend.

  • Jun 2025

    Project 1007 -
    Mike completed a large renovation for us in Durham region,
    The project was well done, the attention to detail really makes it appear well done.
    Mike spends ALL of his time working on your project which makes it extremely easy to meet and review the project as it evolves.
    We went ahead and created a finishes list to allow for proper ordering and timing, Mike also gives you a great template to start from, along with ideas on his original scope of what he would do or install. We found this helpful.

    Overall a good experience,

Hours

Monday: 8AM - 5PM
Tuesday: 8AM - 5PM
Wednesday: 8AM - 5PM
Thursday: 8AM - 5PM
Friday: 8AM - 4PM
Saturday: ClosedSunday: Closed

Location

804 Ritson Road South rear unit, Oshawa

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