J.J. McGuire is a proud member of the following organizations:

General Contractors Proudly Serving the Construction Demands Across Ontario Since 1987

Since its inception, J. J. McGuire has achieved a proud reputation in client relations focused on completing the highest quality of work, on time and within budget to the satisfaction of our clients.

Our services include general contracting, construction management and design-build services focusing on a comprehensive range of projects and scopes. Our recent volumes of construction completed exceeds $145 million and our current bonding capacity is $75 million.

Our portfolio covers a broad range of sectors within the construction industry. This includes industrial, commercial, institutional (I.C.I.), automotive, government, infrastructure, entertainment, recreation and multi-use seniors residences.

Today, J. J. McGuire is recognized as one of the largest general contractors in Durham Region. Our established success and continued growth in completing large, diverse and complex projects are attributed to our team approach and the ability to easily reach the highest levels of management at all times. Our partners are involved in all aspects of our projects and daily operations.

Meet our leadership

About Us


J. J. McGuire was established in 1987 by John McGuire and Frank Difelice followed by Jim Green in 1989.

Quality Work

J. J. McGuire takes pride in our dedication and transparency meeting uncompromised quality

Dedicated Team

We are very proud to acknowledge that several of our employees that began with J.J. McGuire in 1987 are still with the company today. The honesty, integrity, and quality of our team are some of the keys to our continued growth and success.

Client Satisfaction

We are honored and proud to include among our many clients, the likes of General Motors, Ford, Chrysler, Dupont, Durham College, Trent University, LCBO, the City of Oshawa, City of Peterborough, Toronto Transit Commission, just to name a few.

Community Involvement

J. J. McGuire is a very active member of the community, working together with groups such as Big Brothers Big Sisters South West Durham & Northumberland, the Children’s Aid Society, Feed the Need of Durham, Lakeridge Health, Parkwood Estates, 100 Men of Oshawa, 100 Men of Port Perry, Durham College, various universities and many others organizations. We helped to establish “Companies Who Care”, a group of Durham Region contractors and others who are dedicated to raising funds for local charities.

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J. J. McGuire General Contractors