This study employs a comprehensive life cycle assessment methodology, utilizing the SimaPro software and the Ecoinvent database by using ReCiPe method, to evaluate the environmental impacts of cement composites modified with industrial waste materials. Aimed at minimizing industrial waste and reducing landfill dependency, this research investigates the substitution of 20 wt.% of traditional cement with three alternative materials: brick powder, biomass fly ash (BFA), and clay slate waste. These modified composites are compared against a reference sample composed of cement, fine sand, and water, focusing on their potential to enhance composite properties while assessing their environmental impact. The primary environmental metric considered is the global warming potential (GWP), alongside a broader evaluation of impact categories including ecotoxicity and human non-carcinogenic effects. The findings reveal that composites incorporating brick powder exhibit the lowest GWP, closely followed by those containing BFA, with the reference cement composite showing the highest GWP. This suggests a significant potential for reducing greenhouse gas emissions through the incorporation of brick powder. However, the evaluation of other environmental impact categories presents a more nuanced picture. Notably, BFA-incorporated composites contribute to increased ecotoxicity and human non-carcinogenic impacts, positioning them as less favorable when considering these specific categories. Substituting a part of the cement resulted in a reduction of greenhouse gas emissions by 13.7 to 20%. Nonetheless, by evaluating both the contribution to global warming potential (GWP) and the mechanical characteristics, such as compressive strength, a decrease in the carbon footprint of up to 29% compared to the reference sample can be realized. This research underscores the complexity of optimizing cement composite formulations for environmental and performance metrics. By demonstrating the varying environmental trade-offs associated with each type of industrial waste substitute, it highlights the necessity of a holistic approach to materials selection in sustainable construction practices.