Sand Hills Cottage architecture is a modified form of Greek Revival architecture which developed in the Sand Hills area of the U.S. state of Georgia.

The form has symmetry, wide entablatures, and classic columns of the Greek Revival style. It may include Greek Revival front doorway details, such as having a rectangular transom with side lights. But if it has a “one-story, high-pitched side gable roof, three gable dormers, and a full-facade porch” then it would be characterized as the Sand Hills variation. Seclusaval is “an excellent example” of this type.

From 1820 to 1850, the Greek Revival style dominated the United States. Examples of vernacular Greek Revival continued to be built even farther west.

This style was very popular in the US, and many mansions and houses were built for the merchants and rich plantation owners; Millford Plantation is regarded as one of the finest Greek Revival residential examples in the country.

Examples include:

Seclusaval and Windsor Spring (1843) in Richmond County, Georgia
Brahe House (1850) in Richmond County

Source From Wikipedia