The uncontrolled use and disposal of plastic materials present significant environmental challenges in urban areas, particularly in slum settlements. This study examines the impact of plastic waste on the architectural composition of urban slums in Jos Metropolis, Plateau State, Nigeria, with the aim of improving the quality of the built environment. The research focused on Anguwan Rogo, a community within Jos Metropolis, and utilized physical observation, digital photography, case studies, and a review of related literature. The findings highlight the negative consequences of plastic waste, such as environmental pollution, foul odors, large-scale flooding, and the aesthetic degradation of the built environment. Additionally, the accumulation of plastic waste has led to increased health risks and disruptions to the functionality of urban infrastructure. The study emphasizes the need for increased awareness programs on the dangers of plastic waste, as well as the improvement of plastic waste collection, treatment, and disposal methods. It also advocates for the adoption of sustainable practices in managing plastic waste to safeguard the built environment and enhance the overall quality of urban life. This research provides valuable insights into the interplay between waste management and architectural composition in urban slums, offering recommendations for mitigating the adverse effects of plastic waste in these areas