"When it comes to zoning, there has never been a prohibition on tiny homes, Khawam and another county planning official said. That is also the case in Tucson city limits, where tiny homes permitted as manufactured or mobile homes can be placed in certain zoning areas, like trailer parks. However, their small scale makes it essentially impossible for them to meet building code requirements in Tucson city limits. In unincorporated Pima County, tiny homes on a permanent foundation are allowed in any zoning area that permits “detached, single family dwellings,” the county’s website says. .... Recognizing the unique scale of the homes, the county will “waive certain building code minimum standards,” such as minimum dwelling, room and ceiling dimensions, and stairway requirements for loft areas..... ....County accommodations for homes less than 400 square feet allow for loft areas with “reduced fall protection,” a reduced number of electrical outlets and “alternative compliance” for mechanical and electrical systems."