Energy efficiency investments have become strategically important for the European Union. In particular, energy efficient renovation and investment in its existing building stock have become a major challenge. Creation of a high-performance building should be carried out according to a holistic and integrated design process, which considers all three aspects of sustainability. The aim of this work is to suggest a mathematical model that considers the weight of each sustainability aspect, to support housing owners in decisions regarding the optimal sustainable renovation alternative. Multi-criteria decision making (MCDM) concerns structuring and solving multiple-criteria decision problems. MCDM has become popular in energy planning as it enables the decision maker to give attention to all the criteria available and make the appropriate decision as per the priority of criteria. In this study, an example explains the suggested numerical system for comparing different renovation alternatives. The suggested method will facilitate the decision making process in renovation projects and allows housing owners to choose the best renovation method according to their companies policies and preferences.
Keywords energy efficient renovation, sustainable renovation, weighted sum method (WSM), multi-criteria decision making (MCDM)