Small, even tiny, homes are not a new thing. The house I grew up in was not much larger than the Futuro. A local museum has the house of a local artist inside, and it is about the size of a tiny home. Of course, you also have people living in mobile homes and trailers. I doubt that building codes have much to say on small homes, though zoning would.
That said, the design and materials would have an impact for more innovative designs.
That said, the design and materials would have an impact for more innovative designs.