Serving Silicon Valley and the Bay Area since 1906


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.

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.

comprehensive design



new construction

Sheet Metal Fabrication

HVAC & Plumbing

Superior Work and Service

We serve various types of industries

From the time our founder, Oren Charles McDonald, installed the first air conditioning system in San Jose in 1906, we’ve been committed to providing superior work and service to every customer. We keep everything in house to ensure the highest possible quality. When you contract with us, we’ll fabricate the sheet metal and mechanical piping at our own facilities. That way we’ll be able to ensure that we meet all safety and quality standards.

We established our business to help customers like you with your construction projects. The scope or size of your undertaking makes no difference to us. Our contractors are up to the challenge.

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