Abstract
The construction sector is a major contributor to global resource depletion and environmental impacts. Most buildings still lack energy efficiency, necessitating substantial renovations to reach European climate neutrality by 2050. Energy efficiency measures typically prioritize investment cost and targeted energy performance, often neglecting the environmental impact associated with the production and disposal of the selected materials. This paper presents the development of a design assistant tool that combines sustainability indicators with cost and energy performance, aiming to foster sustainable renovation. Through automated data exchange between Autodesk Revit, CasaClima software and Microsoft Excel, the tool identifies optimal retrofit solutions. Users can choose materials and systems and visualise different retrofit alternatives through a user-friendly interface. The paper describes how the tool is structured to quickly evaluate a wide range of energy efficiency measures.