I think that is a key element. My nephew's house was comparable in cost to other traditional housing around. But I've seen some houses that are costing 30% less. The construction techniques are the heart of it. If the building is post & pier, floating slab foundation, minimalist interior, maybe even a colored concrete finish and no floor covering per se, perhaps "Shouse" or "Barndominium" applies. But these "alternative" designs are in a very broad range and one reason I am so serious about the cost as a proxy for quality. That was the gist of my old class I taught years ago on building design. It is all about the frame and the foundation as well as the materials and design.