Gain extra storage space under a bed base that is too low by placing 5cm blocks of wood under the legs. This enabled me to fit 3 plastic under-the-bed storage boxes beneath a single bed. Boxes measure 800mm by 400mm by 170mm deep and there is 20mm clearance gap with that under my bed. The blocks used were from a decking job. Don’t go too high with the blocks – remember someone still has to climb in and out of bed!