The problem of registration of joining a balcony or loggia to a room in an apartment building is very relevant, its study is due to the fairly wide spread of such a housing phenomenon in our country. The article deals with judicial practice on this topic. The arguments of the courts are subjected to reasonable criticism based on the analysis of the legal nature of both specific objects themselves - balconies and loggias, and the fact that they are attached to the premises in an apartment building. The analysis provides answers to key questions: is the balcony (loggia) a load-bearing structure; is the balcony (loggia) to common property in an apartment house; will the purpose of the balcony (loggia) in the case of accession to the residential premises; whether the addition of balconies (loggia) to the premises of the modernisation of the whole building or reconstruction of the joining of the premises, or its redevelopment. The correlation between the concepts of “reconstruction” and “redevelopment” of the premises is revealed. The author’s conclusions can be effectively used in law enforcement practice.