Founded in 1991 by Helge Theiss-Nyland, Bay City Mechanical is one of the largest and most innovative design & build mechanical engineering firms in the San Francisco Bay Area.

With over 25 years of mechanical engineering and HVAC experience, Bay City Mechanical has the ability to offer a full suite of design & build services to the Bay Area’s leading architects and construction firms. Our expertise is not limited to one mechanical trade. It includes: HVAC, Commercial Refrigeration, Architectural Sheet Metal, Pipe Fitting, Building Automation, Temperature Controls and Service. This allows us to successfully complete many of the largest and most challenging mechanical projects the Bay Area has to offer. It is our passion, our experience, and our skills that enable Bay City Mechanical construction projects to be completed on time and within budget.

Our Mission

To be an organization that respects, recognizes, and motivates individuals to excel in serving responsible general contractors, owners, architects, and engineers by using a team approach in designing, planning and installing HVAC systems in a timely manner, with a commitment to customer service and follow-up.