Abstract: A structural member jacking device and method for incrementally raising or lowering a structural member. A structural member jacking device includes a first vertical support column with a repositionable stop. A second vertical support column with a repositionable connector, positioned below a structural member, is movable relative to the first support column and connected thereto by the repositionable connector. An extender is mounted on the second support column and postionable on the stop. A structural member may be raised by positioning the stop below the extender, then extending the extender against the stop, whereby the second support column is raised. The repositionable connector removably pins the first and second columns, while the extender is retracted toward the second support column. Repeating these steps results in incrementally raising the structural member. Performing these steps in a reverse manner results in lowering the structural member.