Constructability and sustainability are two important factors to be considered in the development of a project, since their consideration promotes projects that are easier to construct, have less social and environmental impact, and are more economic. Currently, these factors are beginning to be analyzed separately in the primary phases of projects using the BIM methodology. The BIM methodology enables this evaluation using 3D graphic modelling and parametric objects i.e., objects that store the necessary information for constructability and sustainability evaluation. However, these concepts are usually evaluated separately and few studies exist in the literature that consider the interaction between these concepts within the BIM methodology. Thus, this study develops a process map to establish the information flow between architects and engineers, in order to guarantee a more sustainable project with improved constructability. To help implement the developed process map, a plugin has been developed in Autodesk Revit software. The plugin, named ECOS, performs a quantitative analysis of constructability and sustainability indices to identify which aspects of the project can be improved. Additionally, it considers a cost criterion, which helps the decision-making process. To test and validate the plugin, sixteen architecture and engineering professionals have tested the plugin in an interview setting and have responded a questionnaire evaluating the plugin and their experience with it. From the interview results it can be concluded that the proposed process map and ECOS form a useful tool to promote greater participation of builders and environmental engineers in the project s initial phases, thus helping produce more sustainable projects with improved constructibility.