After 45 years of use without repairs, serious damage of elements of multi-flat apartment buildings is generally observed. In buildings exploited for about 25 years, the effects of corrosion of thin reinforced concrete elements (balconies, loggias, roofs above entrances to buildings and architectural details) are common. Errors in design, realization and maintenance represent a source of the damage.

The paper presents an actual technical state of these elements taking as an example balconies, loggias and the range of their rehabilitation as well as current ways of the surface protection of repaired elements. From the economic point of view it is profitable to connect the rehabilitation of thin reinforced concrete elements, complex repair of buildings and thermo renovation of external walls.