The cost of interior design services in Chennai varies greatly, depending on the complexity of the project and the type of services required.The cost of a professional interior designer's services for a single room can vary greatly, ranging from Rs. 10,000 to Rs. 1 lakh, depending on the size, type, and complexity of the project. Some designers may also charge an hourly rate, ranging from Rs. 500 to Rs. 2,000 per hour.