A Cape Cod will vary in size. Full Capes can be large with two stories and many rooms. However, the front of a full Cape is symmetric in its design. Many half Capes are the smallest versions of these homes. These were considered the starter houses in historic New England.
These style homes do not have a symmetric front. Three-quarter Capes also do not have symmetric front; rather they have two windows on one side of the door with one on the other.
However sometimes, the names full, half, and three-quarter have more to do with their front symmetry than their size.