The construction industry represents a large part of the consumption of natural resources, with construction and demolition waste (CDW) projected to increase worldwide by 70% by 2050 if urgent measures are not taken. Applying circular economy in construction requires product selection in the design phase based on their circular potential, optimizing reuse to minimize waste. A mixed methodology is proposed, combining qualitative components and exploring how the actors involved in construction integrate multiple factors that influence the recovery of the material, assigning them percentage values that reflect the circular potential of the product. This quantitative information will be displayed graphically in BIM (Building Information Modeling), obtaining a synthetic quantification of the percentage of CDW. The circularity of the study model is compared with a more favorable one and a less favorable one, detecting substantial differences in circularity and determining the CDW percentage to formulate informed designs.