Your emergency is our emergency! When time is not on your side, call O.C. McDonald’s 24-hour live operator and we’ll have one of our many experienced technicians address your issue with speed!


(408) 295-2182

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Comprehensive Mechanical Contractor Services

When you’re in need of a mechanical contractor in the Silicon Valley, turn to O.C. McDonald. We provide comprehensive services for large-scale commercial projects involving both new buildings and retrofit construction. Our team can manage all facets of your project from initial design to installation and service. This all-in-one approach can help you get the most out of your budget.

Offering Excellence for Over a Century

Since our company was founded in 1906 in San Jose, CA, we’ve been committed to excellence in service and workmanship. We’re fully licensed to provide mechanical contracting services in California. Whether your project is fairly simple or more complicated, our team of professionals will provide you with quality work and customer care every step of the way. Our team will strive to exceed your expectations for design and aesthetics.

From beginning to end, we’ll work with you to bring your vision to life. We offer a full range of services, including:

-3D modeling with BIM coordination

-Building automation system design and installation


-HVAC and process piping


-and more

We’ve worked with institutions and corporations such as Lockheed Martin, Stanford University, and Santa Clara Valley Medical Center.

If you’re planning a project and need a reputable mechanical contractor, turn to O.C. McDonald in San Jose, CA. We are known for providing outstanding service that’s on time and within your budget. Our crews and service technicians have been helping businesses in the Silicon Valley for over a century. Let us help you today.