McNally International, Inc., a wholly owned subsidiary of Weeks since 2011, is a civil contractor  that specializes in tunnel and marine construction in Canada and the United States. Founded in 1949, McNally is a recognized leader in their field, building the infrastructure that sustains healthy communities and supports growth and development. 

Healy Tibbitts Builders, Inc., a wholly owned subsidiary of Weeks since 1989, is a leader in marine construction, pile-driving and deep-shoring systems in Hawaii and the Pacific region. Areas of expertise include the construction of piers, wharves and offshore structures, and the installation of submarine pipelines and cables. Healy Tibbitts also specializes in dredging, transportation, marine heavy lifts and bulk stevedoring.