The purpose of B. Sc. Thesis was to create an outline plan for rearranging the ground floor of an existing agricultural building to a stable for horses with individual boxes. The ground floor of the building is divided into two parts, one part with a cattle stall and the other part currently empty, except for the two existing boxes for horses. In Slovenia there is no regulation for the size of individual boxes, only recommendations, thus it was necessary to review various sources in which these recommendations are written. We also visited several horse breeders, where we saw different placements of rooms and sizes of horse boxes. Based on reviewed sources, obtained information from the breeders and the current state (restrictions) in the building (e.g. the position of the supporting pillars, position of the opening where hay is thrown down through, and position of the drain) we drew four outline plans. Among these, one outline plan that would best meet the criteria and conditions in the existing building was selected. Following that plan, we acquired eight boxes, a place to wash horses, rooms for feed, tack, hay and bedding, in addition to the already existing two boxes.