Abstract: The present invention is directed to a method of rapidly and inexpensively converting an ocean deck or cargo barge so that it may be used as a U.S. Coast Guard approved manned service and construction barge. This is accomplished by providing the cargo barge with modular components mounted to the deck of the barge. Such modular components include crew living quarters modules, a kitchen module, a mess module, storage module and a central services module. The central services module functions to distribute the utilities required for manned use. Such utilities include electrical power, potable water and fire water. The barge is also provided with generators, fuel tanks, bulk storage potable water tanks and a crane.