Overaa Construction is an American family-owned construction company based in Richmond, California, which provides general contracting and design/build services in Northern California. It is one of the largest contractors in California and since 1993, has been listed among ENR's top 400 contractors in the US. Overaa Construction has a self-performing concrete capability. The company crews perform about 600,000 man-hours on average each year, three fourths of which are concrete work.