Most library buildings were built thirty or more years ago. As a result libraries are sharing a common situation. There is little or no room to add more books onto the shelves, and there are odd spaces throughout the stacks which are not being used. Jackson Library, University of North Carolina at Greensboro, faced this challenge and grew space by utilizing what was available through a complete analysis of the collection and how much space is needed to house the growing collection. How this was accomplished is presented here so that other libraries might benefit from Jackson's experience.