What is the term for a structural wall that is common to two buildings?

The correct term for a structural wall that is common to two buildings is "party wall." A party wall is specifically designed to serve as a dividing barrier between two adjacent properties or structures, typically providing structural support for both. It often arises in situations where buildings are constructed closely together, such as in urban environments where space is limited.

This type of wall is significant in building codes and legal definitions, as it may affect property lines, shared responsibilities for maintenance, and rights of each property owner regarding modifications or repairs. Understanding the concept of a party wall is crucial for professionals in the fire service, as it can influence fire safety measures, access for fire control, and potential hazards in case of fire incidents involving one or both of the buildings sharing the wall.