BS 6349-1-4:2021+A1:2025 is a key part of the British Standards series for maritime works, providing essential guidance on the selection and use of materials for coastal and marine structures. This standard outlines the performance requirements, durability considerations, and environmental factors that must be accounted for when designing maritime infrastructure such as piers, jetties, breakwaters, and quay walls. It helps engineers, designers, and contractors ensure that materials used in harsh marine environments meet the necessary safety, longevity, and sustainability criteria. By adhering to BS 6349-1-4, projects are better equipped to withstand the corrosive effects of seawater, varying climatic conditions, and long-term operational demands.