The U.A.'s Development Studio is a workshop dedicated to Costume adjustments. It is located on the first floor of U.A. High's main building and managed by Power Loader.
The room is filled with various tools, materials and machinery used for costume development. A pile of inventions created by Mei Hatsume can be found in one of the office's corners.
The Development Studio has been frequently used by Mei since the start of her first school year in U.A. High. When Izuku Midoriya, Ochaco Uraraka and Tenya Iida visited the studio for the first time in order to request adjustments to their costumes, they were greeted by an explosion caused by Mei. Power Loader implied that similar events have happened in the past.