The size, weight, and construction of mobile homes differ greatly from traditional brick-and-mortar homes. They are interesting structures because their lightweight portable design allows you to take them with you when you move. As a result, mobile homes typically only weigh between 45 and 50 pounds per square foot, or about 64,000 pounds per square foot. That’s incredibly light for a building! The thin walls and lightweight framework make the structure light. Mobile homes average 8 feet wide and 32 feet long, but they can be as long as 50 feet. They are usually one-story buildings.