This research centres on the need to develop a simple but sustainable material for the utilization of the quantum of plastic wastes that litter our environment. The research uses waste plastics and laterite soil and converts them into construction materials (interlock blocks) with the help of the densifier, thereby reducing the plastic waste, which is a key contributor to environmental pollution. Literature has shown that concrete structure is prone to chemical actions; the durability of conventional concrete bricks gets affected by chemical effects. The chemicals may cause cracking of concrete, rutting, and deterioration of the structure. In the same vein, the plastic-laterite interlock bricks might not be free from such defects due to chemical action. Therefore, this research looks into the effects of different chemical curing conditions on the compressive strength of plastic-laterite paving blocks. Varying proportions of plastic wastes and laterite soil were mixed and processed into composite bricks and subjected to different chemical treatments; in acid, base, oil, and water for 3, 14, and 28 days relative to a concrete brick control. It was observed that samples cured in acid solution gave the lowest compressive strength, while those in base solution gave the highest. The paving interlock blocks made from polyethylene/laterite composite registered relative performance compared to concrete interlock bricks control. If made and put into use, these blocks will reduce construction costs, assist in environmental sustainability and improve circular economic growth. Therefore, using this innovative approach will bolster infrastructural projects and checkmate plastic pollution within our environment.