Abstract: A hazardous waste material container storage building comprising a plurality of modules, each module having a floor for supporting containers of hazardous waste materials and tubes underlying the floor. In one embodiment, a first and second module are provided. A mechanical joining mechanism extends through the first module tube and the second module tube for securing the first module to the second module. The first and second modules are joined to create a single, unitary hazardous waste material storage building. A related method is also provided. Another embodiment of a hazardous waste material container storage building comprises a plurality of modules, each having a securing member disposed on the roof of each module. Two modules are joined by connecting a fastener to the securing members of each respective module. A related method is also provided. The first and second embodiment may be used in the same installation.