Why was Kilwa built largely from stone?

The construction of stone buildings in Kilwa was primarily driven by the accumulation of great wealth resulting from the city-state's control over the gold trade with Sofala.1

While early settlements at the site initially consisted of wattle-and-daub dwellings, the transition to more permanent stone architecture became common by the latter part of the 13th century as the city's commercial importance grew. This architectural shift was facilitated by the prosperity gained from exchanging cloth and glass beads for gold, which allowed for the development of sophisticated structures, including the expansive Husuni Kubwa palace and extensions to the great mosque.12

The architectural style of these stone buildings was inspired by Arab traditions, utilizing materials such as coral masonry, which was also common in other coastal settlements of the era. This transition reflected the city's status as a major mercantile center within the Islamic world, where stone construction served as a physical manifestation of the ruling class's economic power and cultural identity.1