How much would it cost to take up Bachelor degree in interior designing and is it a good option?

In Amity University in Noida campus, it will cost you around INR. 90k per annum and for more details you can visit this link: http://www.amity.edu/course-list.aspx?fd=Design&Programs=Graduate.

Well go for it. Bachelor of design is available in SRM University, Chennai which is of 4 years duration. The application portal is still open. Visit SRM website.