Double wing extension house, also known as double wing folding house, uses galvanized high-strength square tube, galvanized angle iron and other light steel materials as the frame, anti-corrosion double-sided color steel composite board as the wall, and high-strength hinges to connect the frames. After scientific calculation, it can quickly expand the space of the house. The expanded house space is nearly three times larger than before expansion. We can produce 20 foot and 40 foot extension rooms, and also customize them according to customer needs. It is a type of housing with high technological content among container houses for residents.