O'Brien Mechanical Inc.

O'Brien Mechanical Inc. II serves the Greater Bay Area, with headquarters in San Francisco, CA, handling commercial and residential projects including condominiums and community housing developments. Our professional staff delivers full design, construction, and fabrication for plumbing, piping, and HVAC systems throughout this region. We have successfully completed projects in locations such as San Francisco, San Rafael, and Palo Alto.

We specialize in full-service plumbing and piping installations for residential projects like multi-unit condominiums and community housing developments, such as the Cecil Williams Glide Community Housing in San Francisco and the Franklin Center Condominiums with 167 units. Our self-performing teams handle complex systems with innovative engineering and quality craftsmanship to ensure maximum efficiency and minimum waste. As a family-owned contractor since 1970, we focus on delivering on-time scheduling and excellent customer service.

Established in 1970 and operating as O'Brien Mechanical Inc. II since 1998, we have over 50 years of experience serving the Bay Area's most reputable building owners, architects, and engineers with plumbing, piping, and HVAC systems. Our team of over 90 union-affiliated employees generates more than $18 million in annual revenue, self-performing installations for commercial and residential projects including education facilities like Stanford University Library. We emphasize advanced technology and precise fabrication for complex systems.

Our process begins with consultation on your mechanical contracting needs, followed by full design and engineering using innovative techniques for plumbing, piping, and HVAC systems. We then handle construction, fabrication, and installation with our self-performing union tradespeople, ensuring on-time delivery and quality craftsmanship. From initial contact via phone at (415) 695-1800 or email at [email protected], we provide end-to-end service with a focus on efficiency and customer satisfaction.

Yes, we have extensive experience in plumbing and HVAC installations for educational facilities like the University of San Francisco Koret Health & Recreation Center and Stanford University Library, as well as healthcare and commercial projects. Our licensed team (License #754629) self-performs these complex systems with advanced technology and minimum waste. We have built a track record of trust with Bay Area institutions over half a century.

Yes, our over 90 employees include union-affiliated tradespeople who specialize in plumbing, piping, and HVAC installations for commercial and residential projects. This ensures high-quality craftsmanship and adherence to industry standards in the Greater Bay Area. As a family-owned business since 1970, we prioritize professional staff for efficient, on-schedule project delivery.