One of the main goals of the European Union until 2050. is the long-term goal of reducing CO2 emissions from the building sector by 80-95%. The directives of the European Parliament on the energy efficiency of buildings encourage consideration of the installation of high-efficiency alternative systems and the promotion of the use of energy from renewable sources. For all EU member states, there is an obligation to introduce measures to increase the share of energy from renewable energy sources. In accordance with this, the Republic of Croatia defines a long-term strategy for the renovation of the national building fund until 2050, which, for the purpose of energy renovation of buildings as efficiently as possible, considers and defines a cost-effective approach to renovation depending on the type of building, policies and measures to encourage cost-effective in-depth renovation of buildings, policies and measures aimed at all public sector buildings and the assessment of expected energy savings and wider benefits of systematic investment in the integral energy renovation of the national building fund (new jobs, reduction of energy poverty, increase in real estate value, etc.). In its methodological part, the Long-Term Strategy is harmonized with the Integrated National Energy and Climate Plan for the Republic of Croatia for the period 2021 to 2030, and the Energy Development Strategy of the Republic of Croatia until 2030 with a view to 2050. In accordance with the recommendations of the European Commission, the development of the Long-Term Strategy includes setting long-term goals for the restoration of the national building stock at a very high level - a minimum 80% reduction in greenhouse gas emissions by 2050, and proposes clear and implementable financial models for the restoration of the national building stock by 2050 , and assesses the impact of proposed policies and measures on national economic development.