Structural designers are responsible for the design and construction of large-scale structures. They work with a wide range of materials, including concrete, steel, wood, and other building materials. Their job is to ensure that all aspects of a structure from its foundation to its roof are structurally sound and safe for people to occupy or use. Structural designers may also be involved in the planning stages of a project. This might include working with architects and engineers to determine which materials should be used and how they should be assembled. Structural designers must understand engineering principles and know how these principles apply to different types of structures.