Due to the increase competition in the global markets, companies are increasingly receptive to new tools, which help them to improve their processes in terms of economic, environmental and social aspects. This paper aims to analyze an already existent retrofit tool called SustainPro in order to assess the level of input detail required for the analysis. Three scenarios with an increased level of input detail were analyzed. SustainPro was run to all the scenarios and conclusions were taken about the achieved output: indicators sensitivity and the design outcome suggested by the methodology. This work presents a new approach to simplify the input data used in this retrofit analysis (SustainPro) when used by industrial companies, which usually present very complex flowsheets. This study will be based on a formaldehyde production process accomplished by a Portuguese company.