Abstract: An adjustable furniture leg extension device for use in raising the height of a piece of furniture, such as a chair, table or bed. The device includes a base having a bottom surface for resting on a floor, and an adjustable support member received within the base. The support member includes an upper load-bearing surface on which the furniture leg may rest. A generally rigid stabilizing arm extends laterally from the base and includes a stabilizing foot having a bottom surface which is generally co-planar with the bottom surface of the base. The adjustable support member may include a rim extending upwardly from an edge of the load-bearing surface, the rim serving to help retain the furniture leg on the load-bearing surface. One such leg extension device is placed beneath each leg of the furniture item to be raised, with the respective stabilizing arms turned inwardly beneath the furniture item.