Which wall is constructed on the line between two properties?

A party wall is specifically designed to be built on the boundary line between two adjacent properties. This type of wall is often used in shared buildings or structures, such as duplexes or townhouses, where both property owners have rights to the wall. The purpose of a party wall is to provide structural support for both sides while also serving as a barrier for privacy and fire protection.

In contrast, a partition wall is an internal wall that divides spaces within a building but does not possess the same shared ownership or boundary function as a party wall. A pitched roof refers to the angle or slope of the roof structure and is unrelated to property boundaries. Projected windows are architectural features that extend from the building's façade and are not connected to property lines in the same way as walls.

Understanding the function and construction of a party wall is essential in property law and building regulations, particularly where two properties share a physical boundary, making it crucial for fire inspectors and builders alike.