Chettinad architecture is known for the opulent mansions built by the prosperous Chettiar trading community in the Chettinad region of Tamil Nadu between 1850-1940. The mansions had a grid-like layout centered around a courtyard, with rooms arranged around it. They were built with local materials like bricks, tiles, and lime plaster and incorporated design elements from the Chettiars' foreign travels. The architecture was well-suited to the hot, dry climate, using techniques like thick walls, courtyards, verandas, and roofs to keep interiors cool.