Main goal of work is to develope optimal design of concrete frame construction, single-storey underground garage, coupled with analysis of slender concrete columns for different load combinations. I suggested all elements according to STN EN 1992-1-1. As a model for analysis of concrete columns, I chose square cross section dimension 300x300mm. Column elements should be able to safely transfer the load of ceiling board and the load resulting from the function of ceiling as an outdoor parking area. Analysis is performed with a final assessment with regard to material consumption and limit states of construction.