When an architect ideates a complex building envelope, they often count with a façade consultancy to develop the detailed final solution of their design. The purpose of this paper is to describe a customized BIM methodology to develop complex building envelopes, evaluating the process followed to convert an architectural concept design to a fabrication reality. Over recent years, building information modelling has had a great development for Architectural, Structural and MEP disciplines, and it

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... is a convenient practice to advance and analyze the variables of a concept design or furthermore, to coordinate disciplines during the detailed design phases. However, when a technical approach of the envelope's design has to be implemented, we need detailed engineering tools to simulate the environmental data, and to analyze and develop the system's fabrication features and assemblies, which are tedious to incorporate on BIM basis. This paper describes the process followed to develop an execution project of a building envelope, starting with a concept design and incorporating the virtual simulation processes for the solution to meet the structural and thermal requirements. The final aim is to have detailed drawings and documents of the envelope's elements, with coordinated information for construction and fabrication purposes.