Abstract: An adjustable support is useful to carpenters for installing cabinets and handrails in buildings. The adjustable support comprises a stand that defines a longitudinal axis. An adjuster is threaded into the stand. A carrier rests on the adjuster. The stand provides coarse adjustment, and the adjuster provides fine adjustment, of the carrier. In one embodiment, the carrier is a flat plate that supports a cabinet. A tray secured to the stand stores tools used to install the cabinet. In another embodiment, the carrier includes a cradle that is pivotable to match the angle of a handrail along a stairway wall. The cradle may be offset from the stand longitudinal axis. Alternately, the stand has a working edge that is spaced relative to the cradle such that placing the stand working edge against the stairway automatically positions the cradle at the proper spacing from the wall.