Rapid sand mining for construction purposes has resulted in a crisis of good quality granular soils. Use of locally available marginal soils having fines content of 10–35% can be a viable alternative, provided reinforcement and drainage elements are incorporated in the design to increase bearing capacity and to facilitate drainage. Geosynthetics have emerged as potential inclusions in this regard. An attempt has been made in this study to arrive at design guidelines of geogrid reinforced slopes constructed with marginal soils subjected to surcharge loading. Numerical analysis is conducted using Geostudio software by adopting hyperbolic constitutive law. The numerical model is validated by recreating full scale study of Bathurst et al. [2] and comparing the corresponding load deformation characteristics. Numerical investigations are subsequently undertaken by varying the slope inclination (2 V:1H, 3 V:1H and 4 V:1H) and the setback distance from slope crest (b/B ratio of 1, 2, 4) for both geogrid reinforced slope and unreinforced slope. In addition, the effect of surcharge loading of varying magnitude of 25, 50 and 100 kPa on slope deformation aspects is studied. The results indicated that at lower loading intensity, the effect of inclusion of geogrids is marginal in minimizing horizontal and vertical deformations. However, for higher loading intensity, there is significant reduction in slope face deformations by 14–16%. Additionally, it was observed that for higher setback distances (b/B = 4), the maximum horizontal and vertical deformation of slope face decreases significantly than when surcharge loading is placed at relatively lower setback distances (b/B = 1).