A Modular home is constructed in components in the factory and then a specialized builder assembles these components and adds the desired appointments on the home owner's private property. Modular homes can be one or two stories and meet state and local agency approval just the same as site built homes.  In Pennsylvania, it is referred to as the International Residential Building Code.

Modular homes can be one-or-two story dwellings and are delivered to the home site in two or more sections, sometimes as the shell of a home. These· sections are referred to by the industry as "boxes". Part of the interior work is accomplished at the factory, but most of the interior and exterior finish work is completed by the builder at the home site. Modular homes can only be placed on private property and will look identical to site built homes.