Efficiency in Building Renovation: A Review of Its Definition and Importance

The aim of this article is to define the concept of efficiency, to identify its importance in the construction industry and to present specific case studies of efficient building renovations. In exploring this topic, an analysis of the available literature and the study of real case studies from around the world was used. The findings show that efficiency in building renovation has a significant impact not only on economic performance but also on environmental and social sustainability. Economic considerations are often a priority for project participants, with the greatest emphasis on investment costs and return on investment. Social criteria such as thermal comfort are also important, especially during the occupancy phase. In particular, effective renovation can bring improvements in the environmental impact of the renovated building. The importance of efficient building renovation is evident not only from an environmental point of view, but also from an economic and social point of view.