Three story house plans (often written "3 story house plans") can be super-luxurious, super-practical, or both. If you're looking for a mansion floor plan, many live right here in this 3 story collection. That said, you'll also discover a variety of simple three story house plans below, which might be just what the doctor ordered if you're working with a narrow lot and a tight budget (as is often the case when you're trying to build a home in a densely populated area, like NYC or San Francisco). If you're working with a sloping lot, a 3 story house plan might also be your best bet, as many 3 story home plans feature a walkout basement, which can maximize living space.
3 story house plans often feature a kitchen and living space on the main level, a rec room or secondary living space on the lower level, and the main bedrooms (including the master suite) on the upper level. Having the master suite on an upper level of a home can be especially cool if your lot enjoys a sweet view of the water, mountains, etc. That said, if you intend to age in place, consider selecting a 3 story house design that features its master on the main level, or, perhaps, a three story design that offers an elevator, so climbing stairs need not be an issue.