A 3BHK interior in Chennai can begin around ₹6–10 lakh for an essential scope and commonly reaches ₹12–20 lakh for a fuller mid-range specification. Premium materials, extensive ceilings, automation and imported hardware can take the project beyond ₹25 lakh. This room-by-room guide helps you compare quotations before approving the work. What 3 BHK Interior Design Costs in Chennai (2026): The Short Answer For planning purposes, many Chennai projects fall between ₹1,000 and ₹2,