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Prefabrication is a building method that's been around thousands of years. Ancient Greeks used prefabricated elements to construct their temples, as did ancient Japanese when building pagodas. In the United States, prefabricated homes first rose to prominence in the early twentieth century when Sears began selling mail-order kit homes that shipped around the country via railroad car. Today, prefab homes are more advanced than ever and are known for their affordability and energy efficiency.