are modular homes built on a slab
The most important site constructed component for a modular home is the foundation. The foundation must be square, plumb and built to the correct dimensions. Types of Foundation for Modular Homes. Modular homes require a foundation and can not be built slab on grade. Modular homes require space under the home for electrical, HVAC and plumbing connections. The two types of Foundation for modular homes include full foundations and crawl spaces. Prefab home foundation can be conditioned or non conditioned space. Depending on the topography of your building lot, you could take advantage of a walk out basement.