The side-passage house has a square or rectangular plan with an entrance passage on one side of the main floor, which gives the house a distinctive asymmetrical appearance. The side-passage house is one and a half or two stories and displays a remarkable longevity, being used in styles ranging from the Greek Revival to the Prairie School.
The side-passage form originated as an 18th-century variant of the Georgian detached house, which had two rooms on either side of a central passage. In essence, the side-passage house represents two-thirds of the complete Georgian form. The side-passage plan was found in both urban and rural areas of the country during the 18th and 19th centuries.