What aspect of a building is least likely to be shown on foundation drawings?

Foundation drawings primarily focus on the structural aspects of a building's foundation, which includes elements such as footing depth and width, load distribution, and subsurface drainage. These drawings are detailed representations that provide critical information needed for the foundation's construction and ensure the building will be stable and safe.

The correct answer highlights that window sizes and styles are not typically included on foundation drawings. This is because foundation drawings concentrate on the ground level and below, focusing on how the structure will be supported rather than the aesthetic details of above-ground features like windows. Such architectural details are usually depicted in architectural drawings, which address the overall design and visual elements of the building above the foundation.

In contrast, footing depth and width are crucial for understanding how much load the foundation can bear, load distribution is necessary to ensure that the weight from the building is adequately supported by the foundation, and subsurface drainage is vital to prevent water accumulation that could damage the foundation. Thus, the presence of window sizes and styles is least relevant in the context of foundation drawings.