A basic consultation of interior work should cost between INR 40 and INR 60 per square foot. Therefore, while execution of a basic design should cost between INR 700 and INR 1000 per square foot

Interior designers make indoor spaces functional, safe, and beautiful by determining space requirements and selecting essential and decorative items, such as colors, lighting, and materials. They must be able to draw, read, and edit blueprints

It varies from 3.5 lakhs to 7 lakhs roughly and dipends on the types of designs you will be doing in your flat.