The dissertation is aimed to present different aspects of sustainable development of the complete energetic renovation of an apartment building. To attain a systematic order, we divided the dissertation into two parts. The first part focuses on an overview of today’s challenges, current legislation in the division of energetic efficiency and precise description of the existing condition of an apartment block, built in 1964 and located on Kumanovska ulica 1 in Poljane district in the municipality of Ljubljana. In collaboration with specialists from different professions and with floor owners, technical documentation with the most suitable option of the renovation for the chosen building was made at the Building and Civil Engineering Institute ZRMK. We carried out an analysis of the existing condition of the building with a computer software named KI Energy 2014 and displayed that characteristics of energy indicators of the existing building don’t fulfil the demands of current legislation. We upgraded the model with a planned proposition of the renovation and showed improvement of the valued temperature needed for heating, needed annual primary energy and supplied energy for normal functioned building as a part of the comparison between the existing scenario. After consulting with experts from GI ZRMK, we developed an idea to upgrade the project we set for this dissertation and added a transparent display analysis of eleven chosen optional scenarios for improving energetic characteristics. The second part focuses on the subject of sustainable construction, to which we pay more attention lately. When we evaluated different scenarios, we considered various aspects, including environmental acceptability, economic eligibility, technical practicability and terms of cultural heritage. Through the analysis of the building’s energetic efficiency, we presented fulfilment of all terms based on valid legislation. Regarding the functioning of the whole building, the analysis of its effect on the environment confirmed that by using reusable energy resources the emission of carbon dioxide is heavily reduced. By analysing the cost-effective energetic renovation, we checked which of the chosen scenarios of the investment will be paid out in its lifetime. In the end, we analysed the airtightness or performance of the BlowerDoor test in two selected apartments by which we tested the technical aspect of sustainable construction. During the project, we were in constant touch with residents and gathered a lot of valuable information which are needed to be included in the analysis of sustainable construction’s social indicators. This information was a good base for this dissertation.