A roof steel structure constructed in the 1990s, spanning 18.70 m with a height of 4.20 m and supported by 30 cm thick concrete walls, was examined for potential retrofitting solutions. The roof's truss frame features both welded and bolted connections, presenting a complex structural system typical of industrial buildings from that era. The structure underwent 3D scanning to generate an accurate digital model, enabling a comprehensive assessment of its geometry. A comprehensive nonlinear structural analysis, incorporating all sources of nonlinearity, was conducted to evaluate the current structural capacity and explore retrofitting methods to ensure compliance with current codes and standards. Geometrically and materially nonlinear analyses with imperfections (GMNIA) were employed to obtain the complete behavior at representative design load combinations. The study emphasizes comparing various retrofitting approaches through Life Cycle Assessment (LCA) analysis. This approach not only considers the immediate structural improvements but also evaluates the long-term environmental, economic, and social impacts of different retrofitting strategies. By employing this comprehensive analytical approach, the study aims to develop optimal retrofitting solutions that address immediate structural concerns while enhancing the overall resilience and longevity of the structure in compliance with the latest engineering standards. The integration of structural analysis with LCA provides a holistic view of the retrofit options, allowing for more informed decision-making that balances structural integrity, environmental impact, and economic feasibility.