The current financial crisis is imposing shipbuilders to reduce costs and construction times in order to fight against orders cutback. In yacht design studios, based on improved aesthetics, this goal cannot be accomplished by skimping with internal and/or external furnishing, but it must be achieved by reducing weights and costs of structural components, which can compromise the static or dynamic stability or the structural strength of a super yacht. In this scenario, superstructure scantling is becoming the most critical aspect of structural design: they are built using materials, like aluminium light alloy, which has low mechanical characteristics. Moreover, on the superstructure sides, big openings are present, where traditional windows have been drastically enlarged to provide beautiful, vast panoramic views of the landscape for the owners and their guests. Furthermore, the aforementioned cutback of costs and weight is achieved by reducing beam scantling dimensions and plate thicknesses to the minimum imposed by the Classification Society Rules, which use too small safety coefficients; this trend might became very dangerous if loads acting on the yacht are not thoroughly assessed during the preliminary design stages.In this paper, the structural response of aluminium light alloy superstructures is studied by a finite element approach, coupled with static and dynamic loads imposed by the Classification Society Rules, with particular attention related to the buckling phenomena that occurs to slender stiffeners around windows.