With increasing urbanization, soil has become a crucial resource for supporting infrastructure. However, certain soils, like black cotton soil (regur soil), are unsuitable for construction due to their expansive nature caused by montmorillonite. To improve such soils, stabilization techniques are used to enhance their bearing capacity and durability. Stabilizers like calcium carbonate, rice husk ash, and ground-granulated blast-furnace slag modify the soil’s properties, reducing plasticity and swelling. This improves load-bearing capacity, minimizes settlement, and ensures the long-term stability of foundations, making problematic soils suitable for construction. The present work is about effective utilization of saw dust and wood ash in development of subgrade attributes of swelling soil like black cotton soil. The test program includes usage of different percentages of saw dust such as 0%, 3%, 5%, and 7% by weight of dry sand, and highest dry density and ideal moisture content are determined through standard compaction test, followed by CBR test. Similarly, wood ash is also added in various percentage ranging from 0 to 0.75% which is applied to soil for analysis and stabilized, and their properties of liquid limit, plastic limit, and strength characteristics are obtained by conducting California load-bearing index and comparing obtained results with virgin black cotton soil properties and strength parameters. It was observed that adding sawdust improves the soil’s bearing strength. While the CBR values increase for all combinations of black cotton soil samples, the highest CBR value was observed at a mixture of 7% sawdust and 0.75% wood ash content.