The invention relates to a method for building a protective structure, comprising the following steps: a) a support structure (10) having a plurality of parallel support rails (12) is provided; b) a group of panels (20) is provided; the panels (20) being able to be fitted and to slide on the support rails; d) the panels (20) are transferred from the storage position to a final position resting on the support rails by the execution of the following operations: d1) at least one of the panels (20) is transferred from the storage position to a position for fitting on the support rails (12) with the aid of a transfer device (40, 140, 240) lifting said at least one panel upwards; the transferred panels being placed one after another on the support rails; d2) the transferred panels are moved along the support rails (12). The invention also relates to a kit for building a protective structure according to the above method.