<p>This study aims to design an excavation support system for a building in Saudi Arabia. This study investigates the efficacy of 4.75-meter cantilever retaining walls affected by groundwater. The retaining walls were examined at a site comprising two soil strata with different properties: the upper layer consists of clean sand, while the lower layer is composed of a substantial silty sand. The comprehensive evaluation of failure due to sliding, bearing capacity, and overturning was conducted. The active and passive lateral forces for the retaining wall design were computed following the Rankine method. The standard penetration test (SPT) was conducted as a field test employed to obtain soil samples for laboratory analysis. The initial design and analyses has been performed in Excel calculation sheets to assess the structural response of the excavation walls. Further, the HYRCAN 2.0 software has been used for overall design of the wall. This program employs limit equilibrium analysis methods, including Bishop’s Simplified, Spencer, and Morgenstern-Price. The results indicate that when the groundwater level rises, the factor of safety against sliding, overturning, and bearing capacity for wall reduces. Thus, the worst case is water table at shallow depth near the retaining wall, which is less safe than no water condition. Factor of safety calculations using various slicing techniques show that water has a substantial impact on slope stability and safety.</p>