UL: Modular Construction Factory-built Buildings

The terms “factory-built buildings,” “prefabricated buildings,” “container buildings,” “modular buildings” and “modular rooms” all describe buildings or portions of buildings manufactured off-site and shipped to a destination different from where they were built. Modular buildings are used for residences, hotels, healthcare facilities, offices, data centers and energy storage systems, to name a few. They are a vital and growing trend in the built environment.