The ecoinvent database was used to source of life cycle inventory (LCI) data for each material. It includes all building assemblies, layers and possible materials commonly found in residential buildings in Québec. To prepare the Revit outputs as the appropriate inputs of the LCA model, a functional database was developed. The BIM is conducted with Revit, and the LCA with openLCA. The method is applied to a residential building in Québec, Canada. In this paper, life cycle assessment (LCA) and building information modeling (BIM) are carried out in the early and detailed building design stages. Designers therefore cannot quantify the environmental impacts of buildings in order to evaluate the environmental performance of their designs early on. In the early building design stage, there are numerous uncertainties due to the lack of information on materials and processes.
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