How is an attached single-family house defined?

An attached single-family house is defined as having its own roof and foundation while sharing one or more walls with other residential units. This characteristic allows these properties to be distinct home units while still being physically connected to others, often seen in townhouses or row houses. Each unit typically has its own entrance and is independently owned, maintaining the single-family residence designation.

The option about sharing one wall, while an accurate description of many attached single-family homes, does not completely encompass the essential attributes of having its own roof and foundation, making the latter the more comprehensive and precise definition. The notion of being limited to multi-family units does not apply here, as attached single-family homes can be independently owned. Lastly, the concept of being exclusively built on a single lot does not accurately reflect the nature of attached designs, which may span multiple lots or be part of a planned development.