The new 2015 International Residential Code eliminates the requirement for one room to be at least 120 sq ft – http://sustainablebuildingcodes.blogspot.com/2014/10/tiny-houses-120-square-foot-requirement.html

2015 IRC eliminates req for one room of 120 sq ft

2015 IRC eliminates req for one room of 120 sq ft

While all states have adopted the IRC, there is great diversity in the specific versions. It will take some time before the 2015 is in effect for most states, but it’s still a terrific step forward for the tiny house movement!