As Mark III celebrates 50 years, the company is investing in manufacturing and brining its people together to strengthen how it plans, produces, and delivers projects.
For 50 years, Mark III has evolved alongside the construction industry. What began as a mechanical, electrical, and plumbing contractor has grown into a product-driven manufacturing company with MEP installation capability. As Mark III celebrates its 50th anniversary in 2026, the company is taking another step forward with its move to McClellan Park.
Growth has always required adaptation. Over five decades, Mark III has invested in new capabilities, expanded into new markets, and found new ways to deliver value to customers. While the tools, technologies, and projects have changed, one thing has remained constant: Mark III’s mission to lead the evolution of construction.
Construction is changing. Skilled labor is becoming harder to find, AI is reshaping how projects are planned and delivered, and owners expect greater certainty around cost, quality, and schedule. Together, these forces are driving the industry toward more standardized, repeatable, and manufacturing-driven approaches to construction.
Rather than approaching every project as a one-off solution, Mark III designs and manufactures repeatable building products that bring greater consistency, efficiency, and predictability to the construction process. Combined with self-perform mechanical, electrical, and plumbing expertise, this approach connects manufacturing and construction to improve how projects are planned and delivered.
Manufacturing allows more work to be completed in a controlled environment before materials ever arrive on a job site. It creates opportunities to standardize processes, improve quality, reduce variability, enhance safety, and make better use of a limited labor pool. Manufacturing also provides greater predictability for customers, giving project teams a clearer path from planning through installation and turnover.
Mark III’s move to McClellan Park is an investment in manufacturing and supports the company’s growth trajectory. As Mark III expands its portfolio of work, the new location will create more room for people, projects, and opportunities.
The relocation also reflects the company’s belief that the future of construction will be shaped by standardization and product-driven delivery. Bringing these functions together in one location strengthens the connections between how projects are planned, produced, and delivered. It is both a strategic investment in the future of construction and a continued investment in the people, culture, and relationships that have helped define Mark III for the past 50 years.
Beginning October 19, 2026, our new address will be:
2031 Optisolar Lane
McClellan, CA 95652
Fifty years brought us here. The next 50 will be built on the same spirit of innovation that has guided us from the beginning.