[1] Although the form can be found across historic Charleston in a variety of styles (e.g., Federal, Greek Revival, and Victorian), the consistent feature is interior layout.
The result is a building which is only one room wide when viewed from the street, giving the form its popular name.
Although not a part of the earliest single houses, later buildings had two- and three-story porches, known locally as piazzas, added.
A single house would typically be built along one edge of a property, leaving a carriage way along the opposite side of a narrow lot.
Alternatively, most single houses with piazzas have what appears to be a front door immediately on the street.