In this study, application study of the life cycle assessment (LCA) is conducted on a composite small craft for sustainable design and production according to ISO 14040-14044 series. Procedure of general LCA is reconstituted to apply to composite small craft, and life cycle inventory (LCI) analysis is conducted on principal structures of composite small craft by developing a process flow diagram for boat building. Also, this study leads LCA results of structures and materials into the environmental impact category such as carbon footprint, water eutrophication, air acidification, and energy consumption. Especially, LCA results about production methodologies that are hand lay-up and vacuum infusion of glass fiber reinforced plastic are quantitatively compared and analyzed.