A factory-built home that meets certain federal construction standards. Manufactured homes are typically single-wide or double-wide and are transported from the factory to their site of installation. The term is often used interchangeably with "mobile home". The key difference is the year of construction. According to HUD, factory-built homes that were built after June 15, 1976, are called manufactured homes. Factory-built homes constructed before 1976 are called mobile homes.