A fixture for dumpster bottom replacement is provided including four vertical support legs, three fixed horizontal supports, with each horizontal support attached to two vertical supports, one slidable horizontal support which is slidably attached to two fixed horizontal supports, four upper supports which are integral with the vertical support legs or attachable to the vertical support legs and the upper supports comprise a plurality extension supports and one or more push pin assemblies. A kit for dumpster bottom replacement includes a fixture for dumpster bottom replacement as described above and a lift table including a surface capable of holding a dumpster that is vertically adjustable in height. A method of using a dumpster bottom kit includes placing a dumpster on the fixture with the lift table, securing the dumpster with a slidable horizontal support, removing the bottom of the dumpster and welding a new bottom onto the dumpster.