Paper presents theoretical analysis and results of experimental tests of three prefabricated balcony sets in natural scale with dimensions (width × length × height): 2.0 m × 2.78 m × 0.186 m (in a slope to 0.17 m) and one with dimensions: 2.0 m × 2.78 m × 0.2 m, consists of reinforced concrete slabs connected with each other with steel balcony connections. The impact of variable parameters (elongation of anchorage of balcony connections in ceiling slab, concreting of test elements in two stages, using of muffs as couplers to connect the longitudinal reinforcement bars in balcony sets and different height of the balcony slab) on the load bearing capacity of the elements are analysed. During the experimental tests deformations in the balcony connection using strain gauge sensors were measured. Global safety factor for all tested elements are determined. A numerical shell model of balcony connection is presented, validated using the results from experimental tests.