The reduction of the energy consumption and the improvement of the indoor climate issues when renovating can achieve added benefits including reduced outlay on government subsidies, and improved health due to less air pollution and a better indoor quality conditions and improved worker productivity. This is the essence of assessing the level of sustainability of building renovation projects. The functionality of the Key Performance Indicators (KPIs) approach has made it one of the most popular and valuable tools among recorded literature regarding the measurement of the level of sustainability of construction projects. The aim of this paper is to review the previous studies that employed the KPIs approach in buildings renovation for the measurement of the sustainability of the built environment. This work provides a brief foreword regarding the state of the art in building renovation projects, as well as the suitability of the application of the KPIs approach for the assessment of the level of sustainability in such projects and analyzes the results of the literature review. The future trends in building assessment methodologies for sustainability purposes are also presented, while some significant conclusions are also given based on the identification of the existing gaps of the specific field ; COST Action TU "Smart Energy Regions" 1104 ; Kylili, A.; Fokaides, PA.; López Jiménez, PA. (2016). Key Performance Indicators (KPIs) approach in buildings renovation for the sustainability of the built environment: A review. Renewable and Sustainable Energy Reviews. 56:906-915. doi:10.1016/j.rser.2015.11.096. ; Senia ; 906 ; 915 ; 56