A single-skinned composite lattice sandwich structure includes a face sheet, fiber stringers, and at least one fiber tow arranged in a lattice structure separating the face sheet and fiber stringers. The face sheet and at least the fiber tow(s) forming the lattice may be interfused with a matrix to form a contiguous composite structure. The fiber stringers may be formed of various materials for imparting different structural properties to the sandwich structure, including carbon fiber for tensile strength and lightness, metallic or other rigid material for imparting overall structural rigidity, shape-changing material or actuated material for providing actuated deformation of the structure, and may also include sensors.