The construction industry is responsible for about 39% of energy-related carbon emissions. Over the past few years, green initiatives have focused on operational carbon optimisation, and this has already become a major factor that influences the design process. IPSUM is a fully automated design tool that works inside of Revit that estimates the carbon emission of a project with just one click of a button. This allows designers to integrate sustainability evaluations seamlessly into the creation process throughout the different stages of a project.