The interior of each building in the French Quarter is designed to provide complete privacy from the street outside, with its colonnade, portico, porch, and garden. The massive gate and the high compound wall create an introverted environment inside the house. The architecture of French townhouses is elevated by their simple, monochromatic colour scheme and use of white.

Tamil homes, in contrast, are more “extroverted,” with their verandas (thalvaram) and sitting platforms (thinnai) open to the street, welcoming neighbours and passersby for a chat or visit. The entrance verandas are very welcoming, and they also preserve the privacy of the inner house, as only family and close friends are allowed inside. Also, every Tamil house has a central courtyard (mutram), which is an important architectural space in Tamil architecture. Moreover, passing pilgrims could also spend the night on the thinnai, get ready in the morning, and continue travelling.

Furthermore, buildings in the French Quarter are generally colonial-style villas with long arched doors and windows with vertical cast iron bars as grills, pilaster projections on the main façade, ornate balconies, large courtyards, high ceilings, and stucco designs, whereas buildings in the Tamil Quarter are generally constructed following Vastu shastra and distinguished by lean-to roof constructions, ornamental parapets, decorative wooden eaves and windows, ceiling cornices, wooden pillars, red oxide flooring, teak wood doors with intricately carved wooden frames and a wooden relief on top of the door symbolising the community of the owner.

The Franco-Tamil architecture (hybrid) is a fusion of both Tamil and French architecture; it does not have any conventional style since the elements were chosen at the user’s whim. The lower roof would mostly retain Tamil architectural features, while the upper floor would be French. The INTACH Heritage Center on Aurobindo Street in Pondicherry is one prime example.

Apart from these architectural styles, another unique one can also be seen on the south boulevard of Pondicherry, and that is the Indo-Islamic architecture, which is a perfect blend of Islamic, Tamil, and French colonial styles. The Kuthba Palli of the 18th century is a great example of Indo-Islamic architecture in the region, with its elegant arches and minarets standing in stark contrast to the surrounding European-style buildings.