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Quantifying the environmental impacts and simulating the energy consumption of building’s components at the conceptual design stage are very helpful for designers needing to make decisions related to the selection of the best design alternative that would lead to a more energy efficient building. Building Information Modeling (BIM) offers designers the ability to assess different design alternatives at the conceptual stage of the project so that energy and life cycle assessment (LCA) strategies and systems are attained. This paper proposes an automated model that links BIM, LCA, energy analysis, and lighting simulation tools with green building certification systems. The implementation is within developing plug-ins on BIM tool capable of measuring the environmental impacts (EI) and embodied energy of building components. Using this method, designers will be provided with a new way to visualize and to identify the potential gain or loss of energy for the building as a whole and for each of its associated components. Furthermore, designers will be able to detect and evaluate the sustainability of the proposed buildings based on Leadership in Energy and Environmental Design (LEED) rating system. An actual building project will be used to illustrate the workability of the proposed methodology.

Owners, architects and engineers are more concerned about the sustainability and energy performance of proposed buildings. Evaluating and analyzing the potential energy consumption of buildings at the conceptual design stage is very helpful for designers when selecting the design alternative that leads to a more energy efficient facility. Building Information Modeling (BIM) assists designers assess different design alternatives at the conceptual stage of a building life so that effective energy strategies are attained within the green building constraints. As well, at that stage, designers can select the right type of building materials that have great impact on the building's life cycle energy consumption and operating costs. The aim of this paper is to propose an integrated method that links BIM, energy analysis and cost estimating tools with green building certification system. The successful development of the proposed method helps owners and designers evaluate different design alternatives taking into consideration the sustainability constraints in an efficient and timely manner. BIM's tool is customized to allow its integration with the energy analysis application in order to identify the potential gain or loss of energy for the building, to detect and to evaluate its sustainability based on the US and/or Canadian Green Building Council (USGBC and/or CaGBC) rating systems and to approximately estimate the costs of construction early at the conceptual design stage. An actual building project will be used to illustrate the workability and capability of the proposed method.

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