The obligation of issuing energy certificates for existing buildings or their separately used units that are being sold, entered into force on the date of accession of the Republic of Croatia to the European Union.
Energy certification is a set of actions and procedures carried out for the purpose of issuing an energy certificate, this includes an energy audit of the building, necessary calculations for climatic data to express specific annual heating energy demand, specific annual cooling energy demand, specific annual delivered energy, specific annual primary energy, specific annual CO2 emissions, determination of the building’s energy class, and production of the energy certificate.
The energy certificate is a document that establishes the building's energy class, presents energy performance characteristics of the building itself, and provides data on energy consumption, as well as data on condition of the building in respect to the energy efficiency. Energy certificate also contains a proposal on economically feasible measures for the improvement of the energy performance of the building to reduce energy consumption.
By saving energy and by using renewable energy sources we economize personal resources, while building's energy class can also affect its market value. Depending on the determined energy consumption, a building or facility is classified in one of the eight energy classes: A+, A, B, C, D, E, F or G.
As of 2012, the company Interkonzalting owns the highest level of authority - CAGES, which includes:
· energy audits of buildings with complex technical systems, relating to the architectural and construction part, the electrical and mechanical engineering part of the technical system of a building, as well as parts related to automatic regulation and control of the building's technical system.
· energy certification of buildings with complex technical systems
· energy audits and energy certification of the buildings with simple technical systems