Modular construction is a process in which a building is constructed off-site under factory controlled conditions. Buildings are produced in “modules”.Modularity involves constructing sections away from the building site, then delivering them to the intended site. Installation of the prefabricated sections is completed on site.

Modular units are the sections that are joined together to make a prefabricated building or house. The number of units required differs depending on the size and style of the finished project.