This paper poses the question: Is BIM-based energy simulation reliable? If so, how might this impact early-stage design? This study compares schematic buildings modeled in a BIM-based tool and in conventional building performance software, evaluates the fidelity of data transfer and calculation engine performance, and compares assumptions with conventional methods. Results show that the tested tool provides similar results to an industry-leading software; this can embolden designers to use this at conceptual design and massing stages. The ability to gain traditional engineering insight early in design provides new opportunities for designers to quantify potential energy savings much earlier in the design process than has been historically possible. Improvements in information transfer to energy modelers to streamline detailed model creation are also discussed.
