This thesis investigates the development and application of a computational tool that optimises the conceptual stage design of a building to have minimum embodied energy and some aspects of the operating energy, depending on the adaptability required. For this purpose, a parametric computational framework for sustainable building design was developed and implemented by the tool. The working prototype of the tool focuses on low-rise rectangular grid office buildings in steel. The various competing objectives are optimised by applying multi-objective optimisation techniques. The Embodied Optimisation Tool has been developed as a plugin within Grasshopper, for 3D modeling tool Rhinoceros, in collaboration with Arup, Bouwen Met Staal and Tata Steel.