Abstract: This invention relates to an extendable level device wherein the user may selectively reposition a level portion relative to a frame portion between a compact arrangement and an extended arrangement, and anywhere in between with relative ease and accuracy. In a preferred embodiment of the present invention, the extendable level device is comprised of a level portion that slides in and out of a housing frame, and a locking device for temporarily securing said level portion in a desired position relative to the housing frame. The interplay of the level portion and the housing frame enables the user to both (i) use, transport and/or store the device in its compact arrangement, and (ii) create a longer level device, by sliding the level portion partially out of said frame portion, when the user must level or plum a span that exceeds the length of traditional levels.