What type of building consists solely of two dwelling units?

A building that consists solely of two dwelling units is classified as a two-family dwelling. This term specifically identifies structures designed to accommodate two separate living spaces, each with its own kitchen, bathrooms, and living areas, effectively allowing two families to reside independently within the same building.

Understanding this classification is important in the context of the National Electrical Code, as different types of buildings may have different electrical requirements and safety codes based on their configurations and occupancy types.

In contrast, multifamily dwellings would involve three or more units, one-family dwellings are designed specifically for a single family, and group home dwellings typically refer to facilities that offer housing for individuals with specific needs or conditions, which may not strictly fall under the definition of standard family units. Thus, "two-family dwelling" accurately captures the essence of a building that houses exactly two distinct domestic units.