The structural integrity of a mobile home, manufactured home, or modular home is superior to a site-built home. All components of a system-built home are assembled with jigs, ensuring precision. On a site-built home, carpenters often have to be creative to make things fit, since measurements are not exact.
A home built in a factory is constructed under climate-controlled conditions. This allows builders to avoid weather-related defects: moisture saturation of lumber, drywall, and insulation; warping of walls and doors; and cracking of brittle materials. Therefore, factory-built also means no delays caused by weather.
Factory-built homes are shipped over the road to their final destination. They must be built stronger than more conventionally built homes. Major components (walls, floors, and ceilings) are often bonded with glue in addition to being nailed.
A system-built home of today is more tightly constructed, which improves energy efficiency.
Close quality control-once construction begins, system-built homes must undergo far more inspections than site-built homes.