An end-terraced or end-of-terrace house is one that is connected to only one neighbor, who in turn is connected to two neighbors. As a result, while it shares just one neighbor with the semi-detached house, it is classed differently due to that neighbor's terraced status. End-terraces were most common in the 19th century, but can still be found today in suburban areas where building restrictions prevent the construction of detached houses. End-terraces are defined by their shape as well as by their relationship with their neighboring properties. They usually have three rooms on each floor with a front door on the street side and a back door leading to the backyard. The roof is usually flat except for the presence of a small turret at the corner of the house. There may also be a second-floor front window, but this is not essential for end-terracing classification. The term "end-terrace" comes from the fact that these houses have their own front doors and back doors, which lead out to the ends of the narrow streets on which they stand. These doors are called "ends". If there was no way to tell which was the front door of which house, they would be known as "semi-detached" instead. However, if all you know is that one house has two fronts and another one has four sides, you could call them both end-terraced.