A custom home is made based on the preferences of the owner by a hired architect. Such homes vary in shape, size and design and are often built on a lot that has already been purchased by the homeowner. They are often much more expensive to build than to purchase and are more often considered high end or luxury homes. The major purpose of a custom home is to provide unique housing tailored to the individual client. The complexity of designs in a custom home can vary: A builder can provide a floor plan to a home buyer and allow them to move or add walls, add entire rooms or change the entire arrangement of the house. This term refers more to structural foundation. If a home buyer were to replace the carpeting with tile in a home, for example, this alteration most likely would not constitute a custom home in itself.