The BIM4LCA project report outlines a BIM-based process for calculating building carbon footprints, offers guidelines for BIM-based material inventory, and suggests data requirements and best practices for modelling and data processing to improve BIM data's usability and accuracy for LCA. It envisions automated BIM-based LCA for instant feedback and low-carbon design solutions. The project produced two example buildings with BIM models for practitioners' learning and educational videos on BIM-based LCA. The report highlights the need for Nordic authorities to set BIM requirements for climate declaration and support information harmonization in the construction sector. The report emphasizes the importance of integrating BIM and LCA processes to achieve sustainable construction goals.