Sometimes a Home Warranty is included in the sale of a home. Other times the seller is willing to pay for one if the buyer asks. If you are trying to decide whether to include a home warranty in the sale of your home, or you are a buyer who is confronted with the decision of whether or not to buy a home warranty, the following information from the National Association of Home Builders may come in handy. These numbers represent the 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. Please note that life expectancy may vary greatly depending on quality of material, installation, maintenance, environmental factors and use.