This is my family's house. As you can see it is made from local building materials. The walls are mud brick and the roof is from palm leaves. It leaks a little in rainy season so it has that blue plastic on top.
According to Wikipedia, "Serrekunda (or Serekunda) is the largest city in The Gambia, lying southwest of Banjul. Its population as of 2006, was 335,733 people. Although Banjul is The Gambia's capital, it is on an island and cannot grow further, making much of the growth in Serrekunda."