The Edward Elderkin House, also known as the Round House, is a historic octagon house built in 1856 by Edward Elderkin. It is located at 127 South Lincoln Street in Elkhorn, Wisconsin, United States. On May 3, 1974, it was added to the National Register of Historic Places. The two-story home was constructed of buff brick and features a wrap-around porch, a tall, windowed cupola and a central chimney. References Houses in Walworth County, Wisconsin Houses on the National Register of Historic Places in Wisconsin Octagon houses in Wisconsin National Register of Historic Places in Walworth County, Wisconsin Elkhorn, Wisconsin Houses completed in 1856