I own property in chennai worth 1.5 crores. I wanted to build a commercial area in the ground floor and my residence in the first floor. I have been trying to get some type of loan for 40 laks to cover this construction... I don't know why banks are not willing to give a loan against property or housing loan in this case(I tried icici, hdfc etc). I am a salaried individual. Plz advice.

You could approach nationalised or private banks like Bank of Baroda, ICICI, HDFC. You will need to check if the reason for not offering you the loan is your profile or your income or the property details. It is only on that basis can you plan your next step.