O.C. McDonald Company, Inc. has been the Bay Area's most respected Mechanical Contractor for over a century, specializing in HVAC, plumbing, process piping, building services, direct digital control systems and building automation systems.

We serve a wide range of industries including LEED Certified projects, data centers, high tech clean room construction, process tool installation/fit up, heavy industrial piping, commercial, institutional, healthcare and hospitality.

Our engineered and fabrication/shop drawings incorporate 3D modeling with BIM coordination. Added project support can include custom fabrication both with sheet metal and piping. In addition, O.C. McDonald leverages its experience to offer the right tools to building owners and managers who want to achieve efficient building management.

O.C. McDonald: Specializing in mechanical and plumbing construction and full service commercial or residential HVAC and plumbing for over 100 years.

O.C. McDonald at work

NASA CEV-80 Helium Delivery System | Unitary Plan Wind Tunnel, Ames Research Center, California
"With the help of our team, NASA conducted a very successful set of tests at UPWT. We really apprec  More...

Stanford University - High Energy Laser Laboratory | Palo Alto, California
Stanford High Energy Laser Laboratory needed a reliable control system that could be counted on for  More...

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© 2015 O.C. McDonald Co., Inc.   BIG Design, Inc.
Whether the project is new construction or an existing building, we can provide design/build services, outstanding field supervision and meet all building and energy code standards while staying within budget and on schedule. Above all, every HVAC, piping/plumbing and service technician on our team meticulously follows established OSHA safety standards and requirements.

O.C. McDonald is committed to superior, comprehensive building services and building automation. Our heating, plumbing and piping specialists use the most advanced technology and data analysis to help design the most efficient and cost-effective building systems available. We'll install, maintain and repair your building system to ensure that the heating, cooling and mechanical piping in your building is always reliable and running as expected.