Abstract: An expandable wall start for attaching a movable wall to an end face of an existing structural wall. The wall start includes a pair of clips and a pair of cladding rails. Each clip includes a first fastener portion configured to attach to the movable wall and a second fastener portion including ratchet teeth. The cladding rails are configured to cover at least a portion of the end face of the structural wall. Each rail includes a first leg and a second leg; the first leg includes ratchet teeth on an interior surface. The first leg of each cladding rail is received within the second fastener portion of each clip, and the ratchet teeth of each first leg are configured to engage the ratchet teeth of the second fastener portion of each clip. The wall start is expandable to accommodate structural walls having different widths.