Here's the first FAQ from their FAQ web page.
Question:
Is "House in a Box" (trademark) a prefab / modular built house?
Answer:
Absolutely not! Although the purchase of a House in a Box is almost as simple as buying a prefab/modular home, when completed it is no different than a custom designed home.
We deliver the materials for the model, created and chosen by you, to be constructed on-site, by either yourself or by contracting our exclusive supplier (84 Lumber) to complete your home.
Specific models may have roof trusses which are manufactured in a controlled environment and, if chosen, typical floor systems comprised of pre-manufactured joists (TJI or similar) in lieu of dimensional lumber. HIAB designed our product to comply with the 2009 International Residential Code as well as the 2009 International Energy Conservation Code.
Using the materials we make available and building techniques employed merely simplifies the process of building your own custom home.
http://www.houseinabox.com/
