I found this thread regarding WikiHouse in Denver from Patrick Beseda: And the now defunct funding page:
The project will be under the distinction of installation, or art installation so while we are making prototypes there's not permanent residency. In Denver, there is a clause in the Municipal Code that says, "Temporary housing means any tent, trailer coach, or other structure used for human shelter that is designed to be transportable and that is not attached to the ground, to another structure, or to any utilities system." Temporary housing is excluded from the definition of a "dwelling" which requires all the regulations applied to housing in the Munipal Code. Also the standard "Permit Exempt Work" clause from the IBC 2009 which Denver has adopted: "1. One-story detached accessory buildings or structures used as tool and storage sheds, playhouses and similar uses,not to exceed 120 square feet (11 m2) of projected roof area or a maximum height of 8 feet above finished grade." We think that between these two clauses, plus some honest conversations with the building department, the FOUNDhouse may have a chance at actual occupancy. We would need to get a generous inspector who's in a very good mood. Making the case that it is non-permanent, and small enough to not require a permit may work.