It is cheaper because you can have the prefab structures build off-site in a factory then transported to the construction site as needed. It saves time on the construction itself. So if you cut down construction time by 10%, you save on all the stuff related to construction like labor, heavy equipment operation and rental, etc.
Prefab parts also make it easier to build structures because many walls are identical. Just like putting together a LEGO model.
Time is money.





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