Abstract: An integral modular built-in storage wall system is provided including a plurality of prefabricated modular base components, each having a supporting surface mounted to four adjustable legs located at four corners of the suppport surface, and at least a first removable front cover extending between forward facing surfaces of a first forward pair of the legs. The base also has open side areas between the first and second pair of legs so that, when a plurality of said base components are aligned in side-by-side relationship, a substantially unobstructed passage is created extending along the plurality of base components beneath the top walls thereof. A plurality of prefabricated modular storage components are also provided for mounting on individual ones of the base components. The storage components have substantially uniform depth and height dimensions, but the width dimensions may vary in accordance with a predetermined modular format based on the total width of the wall system.