The stability of building foundations is threatened by soil erosion that occurs in areas where the terrain is prone to erosion by water and wind. This paper examines the effect of erosion on building structures below ground level in Bida Local Government, Niger State, Nigeria. The study employed a mixed-method approach using structured questionnaires and field observation checklists as instruments of data collection, with a total of 120 buildings sampled across three erosion-prone areas in Bida Local Government. Through field surveys, soil analysis, and interviews with stakeholders, the study determined the magnitude of subsurface damage resulting from erosion and its socio-economic impact on local residents. The results show that buildings in the erosion-prone areas are characterized by high subsidence and structural instability, with repair costs on the increase. The paper recommends that better drainage systems, soil stabilization methods, and erosion-resistant materials be adopted in construction to reduce future damage. These measures are crucial for maintaining building structural integrity and the safety of residents in Bida Local Government.

• Erosion
• Subsurface Damage