The paper shows that the daylight is a tool of energy efficiency of the buildings, if it is intelligently controlled. In order to reduce electricity consumptions and organize more natural illumination architects make bigger glazing area in their projects. However, shading devices are required to prevent overheating of inner premises. In the case classification of shading devices is given, as well as the European standarts in the field of shading devices. Also, the article includes guidelines for their designing, implementation and possibilities in using of building repairing. In the case study, the building of Agency for Electronic Communications and Postal Services in Podgorica, Montenegro is analyzed with the help of software tools, which present impact on distribution of daily illumination analysis, also designing of exterior static shading devices is considered.