Prefabricated Modular Building Systems refer to a type of building construction rather than a specific style of the house. Prefab homes are those that are built off-site and then transported to and assembled at a final destination. Prefabricated Modular building systems is more efficient than conventional on-site construction since manufacturing through a production line is more controlled.
Image Source: Google
These are just a few other terms that are often used to refer to a prefabricated house.
Panelized homes are typically constructed in a way that streamlines the construction process. Wall sections, usually between five and twenty feet long, are transported to the site. The panels may be as simple as the studs, or they could include wiring, windows, siding, and the like.
A modular home usually arrives fully assembled before being delivered to the site. The home is delivered in large sections, possibly two, three, or four+ sections depending on its size, and then it's set on the local foundation. It's completed in a matter of minutes once it is in place.
This could, in essence, be similar to panelized. Factory farming, as the name suggests, is done at the factory and not on site. Everything else is built on-site just like a stick-built home. Stick-built refers to traditional studded walls.
The kit home or packaged home is similar to a modular, one in that, almost everything is included in the package that is delivered to your site. The only difference is that the home isn't built in the factory.