Final answer:
The most common type of house style in the United States is the single-story Hall and Parlor house and its two-story cousin known as the I-house. Another common house style is the Cape Cod House.
Step-by-step explanation:
The most common type of house style in the United States is the single-story Hall and Parlor house and its two-story cousin known as the I-house. These folk houses are prevalent in the Mid-Atlantic, Midwest, and Piedmont regions. The design of these houses dates back to European origins and is characterized by two rooms wide with gable end chimneys. Another common house style is the Cape Cod House, which is a variation of the Yankee folk house type featuring four or five rooms arranged around a large central chimney. It is particularly common in Cape Cod, Massachusetts.