The use of Prosopis Juliflora (PJ) ash as a supplementary replacement for cement in paver block production presents a promising sustainable solution for the construction industry. PJ is an invasive plant species that poses significant environmental and socio-economic challenges in many regions. This research paper explores the feasibility and potential benefits of incorporating PJ ash as a supplementary cementitious material in paver blocks. The study investigates the mechanical, durability, and environmental aspects of the paver blocks with differing levels of PJ ash content. The results demonstrate that the incorporation of PJ ash in paver blocks not only diminish the environmental impact but also escalate their mechanical and durability properties. This research contributes to sustainable construction practices by promoting the utilization of waste materials and addressing the issues associated with invasive plant species. By weight of cement, PJ ash is utilised in quantities of 0%, 5%, 10%, 15%, 20%, 25%, 30%. In this study, Prosopis Juliflora Ash (PJA), which has a specific gravity of 3.00 and a mean particle size of 35 micron, was utilised to partially replace cement. As a result, it can be concluded that the inclusion of PJ ash up to a certain replacement level (15%) can enhance the mechanical properties of the paver blocks. However, beyond this replacement level, a slight reduction in strength was observed. These findings provide valuable insights into the mechanical properties of paver blocks incorporating PJ ash and emphasize its potential as a sustainable alternative in the construction industry