The expansion of the middle school building consists in closing the existing terrace on the second floor, for the inclusion of a further six classrooms for teaching activities and a new laboratory. Through the implementation of this volume, the school reaches a total number of 18 classrooms and 6 laboratories, thus expanding its training offer. To minimize construction times and thus limit the discomfort to the operating structure, the intervention was carried out with a main structure in metal carpentry and acoustically isolated plasterboard partitions.