The designer costs roughly Rs 10 per sq ft, depending on the size of the property, and this might go up to Rs 100 if you're only looking for style. However, when items, carpentry, i.e., modular kitchens and closets, flooring, and ceiling are included, this price might rise to Rs 2,000-3,000. You should also take into account any additional expenses, such as furniture, decor, and color schemes. The total cost of an interior design project depends on many factors, such as size, shape, and existing conditions of the space, amount of work required, any special materials used, etc. The designer's fee is based on these factors as well as the owner's budget. In general, an interior design project can range from Rs 20,000 to 500,000 or more. There are several ways to estimate the cost of an interior design project. One way is to ask for a proposal, which is a detailed document that includes all the information needed to give an idea of the cost. This document may not be binding but it gives you an idea of how much things might cost. Another way is to look at other projects similar to yours. Find out what they cost and add them up. This will give you an idea of the overall cost without being bound by anything specific. Of course, you could always spend more or less than what others have done, but this is likely not going to change the overall feeling of your space very much.