Interior design cost depends on multiple things, be it the design style you choose, the materials and finishes you prefer or the specific furniture and decor that you want. For example, a minimalistic 1 BHK home will cost way less than a luxury home interior with lavish furnishing and a modular setup. But to give you an overall idea, a 1 BHK interior design cost can range between INR 2.5 lakhs to 3 lakhs. And the price range can shoot to INR 4 to 5 lakhs for expensive finishes.