Which type of building is least likely to have load-bearing outer walls?

Framed buildings are typically constructed using a framework of vertical and horizontal members, such as studs and beams, which distribute the building's loads. In these constructions, the outer walls often serve primarily as cladding or curtain walls, providing exterior protection and aesthetic appeal rather than bearing the building's structural loads.

This design allows for greater flexibility in interior layouts since the non-load-bearing outer walls can be modified or removed without compromising the building's structural integrity. In contrast, wood frame, unframed, and heavy timber constructions usually incorporate more load-bearing capabilities within their walls due to their traditional construction methods, which depend on the walls to support the roof and upper floors.

Thus, framed buildings represent the construction style that least involves load-bearing outer walls, aligning with the characteristics that define them.