Construction is not an environmentally friendly process by nature. This article presents an buildings life cycle environmental impact assessment and related costs that is applicable to construction phases. Life cycle analysis is considered the best tool because it examines the full range of impacts over all the phases of a building's useful life instead of focusing on any particular stage. Results indicate that the described impacts and costs can effectively quantify the environmental impacts of construction processes, and can potentially be used as a tool for contractors to select environmentally friendly construction plans.