The objective of this review paper is to summarize the numerous investigations carried out by various researchers and engineers about the use of waste materials to stabilize expansive soil. These materials include bagasse ash, eggshell powder, brick dust, fly ash, and other admixtures. Industrialization has led to the production of large quantities of industrial by-products that pose a threat to natural habitats. Disposing of these by-products, such as bagasse ash, fly ash, brick powder, construction and demolition waste, and agricultural waste, has become a potential hazard to the ecosystem. A real solution is necessary, as improper disposal of these wastes into open land or water bodies can cause environmental pollution. One potential solution is to utilize these waste materials in the construction industry on a large scale as a subgrade stabilizer or an additive to cement-based materials. This study investigates the stabilization and strength characteristics of expansive soil using a range of waste materials. Moreover, a comparison is made on the effectiveness of these materials in enhancing the engineering properties of expansive soil. The study found that waste materials such as fly ash and bagasse ash are effective admixtures for strengthening the subgrade of clayey soil by significantly improving the California Bearing Ratio (CBR) value. The highest CBR values at both 2.5 mm and 5 mm penetrations were achieved when the soil was mixed with 10% brick powder content, resulting in CBR values of 7.24% and 6.54%, respectively. Additionally, UCS increased from 0.445 kg/cm2 for virgin soil to 1.394 kg/cm2 for soil mixed with 12% brick powder. In summary, waste materials can be a sustainable and effective solution for stabilizing expansive soils.