Modular homes are constructed to the same state, county, and local building codes as a site built home. A modular home is inspected during each phase of construction and an independent (third party) inspection agency approves each home prior to shipment.
Where would you want the materials for your new home to be stored?
What quality lumber do you expect, and is wet wood acceptable in your new home?
Is standing floor and soaked decking something you want?
Which is a better environment for your new home to be built?