Prefabricated K house is the most economic type of prefab house, usually for labor camp, accommodation, office and so on. "K" means a span=1.82M, standard for one and two floors design, the highest can make three floors.
The expandable tiny house is newest design, the size 10 square meters, 5 steps can install, 1*40'HQ can load 20 sets, fast and easy to install, no need the crane.