The proposal for the implementation of the investment is aimed at energy renovation of a multi-family residential building in the city of Kazanlak, 6 "Iztok" residential area, "A" and "B" entrances, located inland property 35167.505.1092.1 under the cadastral map and registers of the city of Kazanlak. The object is a monolithic multi-family residential building put into operation in 1976. The building has two entrances and consists 5 residential floors, a semi-basement floor and an uninhabitable attic. There are 3 apartments on each residential floor - 30 households. As a result of the the energy survey, it was found that the existing state of the building does not meet there quired energy consumption standards. The building falls into class "F" according to the energy consumption class scale. In this regard, a package of energy-saving measures is offered, through the implementation of which a specific energy consumption, corresponding to class "B", was calculated. The purpose of the investment is the implementation of the following measures to increase the building's energy efficiency: - thermal insulation of external walls; - thermal insulation of a roof; - thermal insulation of a floor; - replacement of windows and doors. The multi-family residential building at 6 "Iztok" residential area, "A" and "B" entrances has significant potential for the implementation of policies and commitments in the field of energy security, protection of clean air, reduction of greenhouse gas emissions (CO2 and equivalent), overcoming "energy poverty" and as a catalyst for targeted long-term housing.