In response to growing concerns about climate change and the need for energy conservation, the building industry is increasingly adopting innovative and sustainable technologies. Smart windows, capable of automatically regulating light and heat, offer a significant opportunity to optimize energy efficiency in buildings. These windows come in various types, including electrochromic, photochromic, suspended particle devices (SPDs), liquid crystal windows (LCWs), and thermochromic, each with unique light and thermal control mechanisms. While each type offers specific features, smart windows generally provide benefits such as reduced energy consumption, enhanced privacy, manual or automatic control, long lifespan, lower maintenance, and esthetic value. Life cycle costing (LCC) is a comprehensive approach for evaluating the economic performance of systems throughout their life span, covering costs from production to disposal. In this study, the SimaPro software is employed to assess and compare the life cycle costs of smart windows with conventional glazing technologies. SimaPro uses real data and simulations to perform both environmental and economic analyzes, evaluating impacts at both midpoint and endpoint levels. This section explores the various types of smart windows, their components, functionality, and environmental impacts, providing a holistic analysis of the potential for energy savings and environmental benefits. Additionally, it includes life cycle assessment (LCA) analysis using the SimaPro tool and data from the Ecoinvent and European Life Cycle databases. This chapter serves as a guide to understanding the LCC and LCA of smart windows in buildings, highlighting their potential to reduce energy costs and environmental impacts.