Complete guide to 2BHK interior design in Kolkata 2026: room-wise costs, 15 stunning design ideas, real project transformations, and AGO Interior Design's verified pricing from Rs.1,700–Rs.3,300/sqft. Whether your budget is Rs.8 lakhs or Rs.25 lakhs, discover how to transform your 2BHK flat into a world-class home with FIDA 2025 award-winning expertise.