Homes that are built entirely in a factory in accordance with a federal building code administered by the U.S. Department of Housing and Urban Development (HUD). Manufactured homes may be single-or multi-section and are transported from the factory to a site and installed. Homes that are permanently affixed to a foundation often may be classified as real property under applicable state law and may be financed with a mortgage. Homes that are not permanently affixed to a foundation generally are classified as personal property and are financed with a retail installment sales agreement.