High Quality Content by WIKIPEDIA articles! Modular buildings and modular homes are sectional prefabricated buildings, or houses, that consist of multiple sections called modules. The modules are six sided boxes constructed in a remote facility, then delivered to their intended site of use. Using a crane, the modules are set onto the building`s foundation and joined together to make a single residential, or commercial, building. The modules can be placed side-by-side, end-to-end, or stacked up to 6 stories in height, allowing a wide variety of configurations and styles in the building layout.