Underpinning & Foundation Skanska, is one of America's foremost deep-foundation specialists. We offer a complete range of services from prime contracting to installation of conventional and specialized high-capacity piling and underpinning. Our capabilities include inspection and rehabilitation assignments; foundations for every type of project, including full-scale marine undertakings. We build supporting structures for all types of projects on all types of sites, from single-story buildings to high-rise structures on rock or soft soil, from municipal infrastructure projects to wide-span bridges and piers in harsh environments.