C. Overaa & Co.

C. Overaa & Co., known as Overaa Construction, is a Northern California general contractor founded in 1907 and based in Richmond. The employee-owned firm builds across water and wastewater, education, healthcare and commercial markets, offering general contracting and design-build delivery. Overaa has a long track record on municipal water and wastewater treatment plants, the kind of complex process-heavy civil work that rewards contractors with deep water experience. The firm competes for and builds treatment facilities throughout the Bay Area and greater Northern California, a market seeing renewed investment as agencies expand capacity for growing demand. More than a century in, Overaa remains one of the region’s established builders of public infrastructure and institutional projects.

C. Overaa & Co. is a general contractor headquartered at 200 Parr Boulevard in Richmond, California, building across Northern California since 1907. Now a fifth-generation family business, the firm describes itself as a self-performing builder — a rarity among large commercial contractors — carrying out work with its own skilled crews rather than layering management over subcontractors.

The company offers preconstruction, general contracting, and collaborative or design-build delivery, and works across a broad set of markets: education, life science and technology, transportation, water and wastewater, healthcare, energy, parking structures, housing, and cultural projects. A dedicated concrete and seismic practice supports both new construction and retrofit work, and the firm maintains a formal sustainable design and construction program.

Across more than a century, Overaa reports helping build some $15 billion of California infrastructure and winning more than 100 awards, and it was recently ranked the top general contractor in the large-company category by the San Francisco Business Times’ Best Places to Work.