The Steel Construction Calendar 2025 is a comprehensive guide that documents the current state of regulations in steel construction. This edition provides a detailed update on the commentary for Eurocode 3 Part 1-8, which deals with the design of connections. Additionally, it presents the essential structural and technical changes in the context of the second generation of Eurocodes. The new drafts for Eurocode 3 Part 6 (Cranes) as well as Eurocode 1 Part 1-3 (Snow) and Part 1-4 (Wind-induced actions on slender structures) are thoroughly explained, with changes compared to previous versions documented. Current research findings are also addressed to promote a well-founded understanding of the new regulations. A particular focus is placed on lightweight construction, which impresses in building construction with high stiffness at low weight and architectural design possibilities. The revision of the section on aluminum structures takes into account the feedback from readers and provides valuable insights into the relevant DIN standards.