Modular homes, just like manufactured and hybrid homes, are also constructed at a climate-controlled building facility, and built to local building codes, in our case CBC code, just like traditional stick-built housing. However, contrary to hybrid modules (which are only core components of a structure finished later on site) modular homes are built in fully or almost fully finished sections (siding and roof), similarly to manufactured homes in that regard. They are transported to site on a frame, which is NOT part of the unit, and installed on private properties and permanent foundations ONLY, being typically craned over the foundation.
Structurally, factory-built housing is generally stronger than site-built construction because each module is engineered to independently withstand the rigors of transportation and craning onto foundations. Once together and sealed, the modules become one integrated wall, floor, and roof assembly. Building offsite ensures better construction quality management as manufacturing plants have stringent QA/QC programs with independent inspection and testing protocols that promote superior quality of construction every step of the way.
Finally, modular homes offer a happy medium between manufactured/HUD homes and the more custom and typically more costly hybrid homes. Anyone looking to maximize their return on investment while retaining broad design flexibility should consider this building option.