Prefabricated Building Assembly Construction Time Prefabricated building construction takes less time than construction. In many cases, prefabrication takes less than half the time compared to traditional construction. A faster setup is provided because of good planning in advance, elimination of weather factors in the field, subcontractor delays and multiple parts can be produced at the same time. Shorter construction times allow construction companies to enter more than one project at a time, allowing businesses to grow instead of putting all their focus and resources on one or more projects at the same time. more..