This presentation focuses on the use of modern parametric design and modelling tools to accelerate the challenging and difficult large design projects. The methodology is also suitable in dealing with renovation and/or modification in the existing structures. Two project examples are presented here namely, renovation of the roof of main train station Dresden, Germany and construction of membrane façade to existing structure of football stadium Metz, France. The structures have deformations with the passage of time and the renovation is more complicated as compared to the theoretical form. Parametric design approach makes this challenging situation feasible to design as well as efficient.