The paper covers a review of the European and Croatian energy efficiency regulations, the energy efficiency directive 2012/27 / EU, the energy efficiency directive 2010/31 (EPBD II), the physical planning act and the construction act. The ordinance on energy examination of the building and energy certification prescribes: the manner and conditions for conducting energy inspection of the building and regular inspection of heating, cooling and ventilation systems and air conditioning in the building. This ordinance defines the energy classes A + to G, two reference climates: continental and coastal Croatia, border at 2200 degree of heating. Thermal requirements for buildings are prescribed through the technical regulation on rational use of energy and thermal protection in buildings according to which the building heating heat demand is an integral part of the project documentation and must be accessible to customers, tenants and other authorized building users. The energy inspection of the building and the energy certificate are made by persons authorized by the Ministry of construction and physical planning according to the regulations on conditions and standards for persons carrying out energy inspections of buildings and energy certification of buildings. Supervision of the fulfillment of the prescribed conditions for carrying out energy inspections of buildings and energy certification of buildings and work of authorized persons shall be carried out by the Ministry and shall take the necessary prescribed measures. In the example of the unfinished building, an energy inspection of the building was performed and an energy class was determined, construction measures for energy efficiency improvement were demonstrated and an energy certificate for the projected state was made.