The California desert seems to draw a lot of prefab prototypes. The JoT House from Yeh+Jerrard LLC is actually named after its prototype location, Joshua Tree, CA. Two original prototypes were built in 2004 in the city and a third was built near Los Angeles.

"Rooms are separated by movable partitions making it easy to convert the house from a one-bedroom loft to a three-bedroom home. The house is planned around a central utility core that houses the bathrooms, kitchen, and laundry facilities; this 'box-within-a-box' design centralizes the major mechanical systems, allows for a variety of room configurations and keeps the costs down."

The JoT House website features some cool materials, including a step-by-step depiction (pdf) of the construction process.

I emailed the company on July 18 to request pricing info; no reply. Documentation claims that the price can be "as low as $100 /sf", but that's basically useless information.

(Hat tip: Materialicio.us)