Off-Frame Modular homes are factory-built homes constructed in sections, or modules built to the same IRC building code and standards, using the same materials, as a site-built home. They are then transported to the building site, lifted off the transport frames, and assembled on a permanent foundation.
Manufactured homes, formerly known as mobile homes, are also factory built but are built to the HUD building code (a government developed code aimed at providing affordable housing). They are transported to the site on their own chassis/frames, which remain under the house, and a “skirt” is erected around the chassis/frames.
On-Frame Modular Homes are a combination of Off-Frame and Manufactured in that they are built to the IRC building code but the frames are left under the house and a “skirt” is erected around them.
Prefab, or prefabricated, homes is a broad term that encompasses any home whose components are manufactured in a factory and then transported to the site for assembly. This includes both modular and manufactured homes, as well as other types like panelized and pre-cut homes.
