It is known that the global impact of solid waste is becoming more worrying day by day; however, the application of reused materials in the built environment is not yet fully embraced. In particular, plastic composites are now fundamental for the global world economy but the organization of their end life needs to be improved. Therefore, the research investigates the possibility of reusing plastic in the built environment through means of robotic fabrication and computational design. Thus exploring different design possibilities based on reclaimed plastic objects, testing their structural stability and robotically modifying them. In order to create a design system for a pavilion made of reclaimed materials, based on a computational workflow. Throughout the course of the research project, physical testing and software simulations have been performed to assess the properties of the robotically fabricated geometry, in order to retrieve design guidelines. Moreover, a digital workflow was developed including performance-driven design, performance evaluation and geometry generation for robotic fabrication. To conclude, the study emphasized how rather than employing new resources in the fabrication of a pavilion structure, it is possible to promote the use of reclaimed material using digital techniques and reversing the design process. Instead of designing a shape and consequently choosing a material, the design will start from the choice of a reclaimed material and the analysis of its potential, in order to originate a structure according to it. Besides the research project aims to facilitate the process through the creation of a computational workflow that can be applied to multiple reclaimed objects and shapes.