The company HIDROENERGA Ltd from Osijek, Croatia, was founded in the year 2009 as a continuation of previous Chartered Engineer Office, and with desire to further develop business activities and entrepreneurial ideas. Company experts are chartered engineers with over 20 years of professional experience in architectural projects design, implementation of conservatory research work, development of conservation studies and projects on immovable cultural assets, mechanical engineering projects of systems and plants (hydraulic engineering, thermodynamics and energy industry) as well as in performing expert construction supervision. The company and the engineering team are certified by the Ministry of Construction to conduct energy audits and issue energy certificates in professional areas of architecture and engineering. The professional staff of the company holds Ministry of Culture licence to perform cultural assets’ protection and preservation works which are related to the documentation of immovable cultural assets and preparation of preliminary, main and final project for the immovable cultural asset. We strive to achieve a recognizable business excellence through continuous professional training. Together with the architectural and mechanical design and expert supervision, we can offer energy audits and energy certification of simple and complex buildings in architectural- construction and mechanical-energy areas. The company HIDROENERGA Ltd. can provide optimized architectural and mechanical technology and technical design documentation, professional supervision of these energy audits and energy certification of buildings with the successful application of new technologies and knowledge. Designing using the advanced computer BIM software and programming packages.