Abstract: This study was conducted to investigate the significance of clayey soil bricks mixed with cow dung to construct sustainable and environmentally friendly buildings. The clayey soil was collected at about 5 km South of Okahandja and the cow dung was obtained from Rietfontein in the Omaheke region of Namibia. Analysis of all the test samples suggested that the California Bearing Ration (CBR) decreases as the amount of cow dung is increased across the entire sample. The cow dung was added as a reinforcing agent in different proportions. The compression test outcome suggests that the strengths of the bricks decrease with increasing cow dung content.