What do we call a house that is attached to another house?

A house that is attached to another house is termed "semi-detached." This configuration refers to a residential building that shares one wall with another house, while typically having its own separate entrance. Semi-detached houses are common in many parts of the world and often provide a balance between the privacy of a detached home and the affordability associated with more densely populated living arrangements.

In contrast, detached homes stand alone without sharing walls with other residences, while townhouses typically refer to a row of similar houses that are connected in a uniform design, often sharing walls on both sides. A duplex is a specific type of residential building that consists of two separate living units, but these units can be stacked one above the other or be side-by-side. Understanding these distinctions helps in identifying different housing types and their characteristics within urban and suburban developments.