UPDATE: I’m happy to let you know that we are offering "3D Interior Design Service" all across India. Affordbale Service which will Enable you to control Time & Money. Validate all your Renovation Ideas before you start Spending Money 👍
1) Best approach is to give business to Contractor or Interior Designer recommended by friend and family.
2) If you do not have reference talk to to 2 – 3 Contractors, tell them your budget and let them come back with details of Estimate and building Material that they will use.
3) If you just want to do wardrobe or flooring or Wall Painting or just bathroom repair – then you don need to go for a designer you can simply buy the material which you like or ask Contractor to buy one for you.