Building renovations are increasingly paying attention to sustainability aspects, with environmental impact evaluation becoming a major concern. In this context, Life Cycle Assessment (LCA) is a tool for measuring impacts on the environment that is often used in the construction process. This study aims to explore the integration of LCA in planning the renovation of building columns and beams. The research methodology for using LCA is carried out by collecting initial identification data on the material life cycle. The results of the analysis show that the column work contributes 15% of CO2 gas emissions (12.1 ton CO2 eq/m3), while the beam work contributes 85% of CO2 gas emissions (68.7 ton CO2 eq/m3). The materials in beam work that produce the most waste emissions are ready-mix concrete and concrete reinforcement. Replacing cement with geopolymer fly ash can reduce emissions by 10.49%, and replacing conventional formwork with aluminum formwork reduces emissions by 12.12%. Further study could be performed by conducting LCA of the different construction materials and methods (prefabricated vs. cast-in-place) to evaluate their overall environmental impact from extraction or manufacturing to disposal or recycling.