A method to make a double panel (12) comprises: the automated or semi-automated production of a first semi-worked piece (31) formed by a first cover (14) on which one or more honeycomb inserts (16) are glued using at least a first glue (19), the automated or semi-automated production of a second semi-worked piece (32) formed by a second cover (15) on which strengthening strips (18) are glued using one or more second glues (20), the automated or semi-automated composition and pressing of the first semi-worked piece (31) and of the second semi-worked piece (32) in order to obtain the double panel (12).