As the population of the country is increasing more and more people are shifting towards the cities and demand for infrastructure is at an all-time high. Due to shortage of adequate subgrade soil, the Engineers are obliged to construct structures on unstable soil. Due to the soil's poor strength and high compressibility, a variety of issues, including slope instability, load-bearing failure, excessive settlement, and total building collapse, may arise. To improve several engineering properties of soil such as bearing capacity, additional materials and different methods are used. These methods include addition of different chemical or pozzolanic filler in different proportions to get optimum engineering properties required for that construction project. Soil stabilization can be achieved through controlled compaction or by using appropriate admixtures, such as fly ash, lime, cement, and rice husk ash. Enhancing the soil's qualities at the construction site is the main objective of this research, so that it can resist the load of the building structure without breaking under its weight. The use of excessive amounts of cement in this procedure is to be reduced, and other materials that can produce the same results are to be explored. Fly ash is one such resource and in many areas it is a more affordable alternative to Portland cement. Thus , some tests are done to identify the maximum dry density, Atterberg limits, maximum shear strength and optimum moisture content of the soil with no additives, one more is to identify the maximum dry density as well as optimum moisture content of the soil with 6%, 8%, 10% fly ash as additive, the results with fly ash and without fly ash are compared to determine the change in the geotechnical properties of soil sample.