What is the common unit of measurement for the height of exterior walls?

The common unit of measurement for the height of exterior walls is feet. This is primarily due to the traditional use of the imperial system in construction in many countries, including the United States. Feet offer a convenient scale for measuring height in practical applications, allowing builders and architects to easily communicate dimensions that are relevant to building design and construction.

When considering the other options, yards may be used in some contexts, but they are less precise for detailing heights of walls since many wall dimensions are smaller than a yard. Inches could be too small of a unit for most typical scenarios when discussing wall heights, potentially leading to cumbersome and less efficient communication. Meters, while standard in many parts of the world, are not as commonly used in the U.S. construction industry. As such, the use of feet aligns better with conventional practices, making it the preferred unit of measurement for this application.