A prefabrication system having a floor component and a frame component. In particular, the floor component includes a deck member, which can be made of deck sections, profiles, or panels. For example, the deck member can be made of continuous panels that cover the desired width and length of the floor component. Alternatively, the deck member can be made of preassembled sections that are combined in juxtaposed relation to form the desired width and length. The frame component includes opposing horizontal support channels that are attached to opposing vertical columns, respectfully.