The National Association of Home Builders published the following list. The represents that maximum number of years you can reasonably expect various components of your home to last, as determined by a comprehensive survey of manufacturers, trade associations and researchers. Life expectancy may vary greatly depending on quality of materials, installation, maintenance, environmental factors and use. Inspectors only reports on conditions at the time of the inspection and does not warrant the life expectancy of homes or their components with the exception of roof life.