Buying a property can be quite a nuanced affair. What your builder or seller tells you is the cost at which he is willing to sell the property. There are other adjunct costs that can add up to quite a bit. The registration cost is about 1% of the value of the property while the stamp duty varies by state and can add up to 2-4% depending on the state in which the property is located. Most builders impose additional costs like building fund, club fees, gymnasium membership fee, car parking charges etc. In addition, you may also have to bear additional costs like estate agent fees, land surveyor fee, notary charges, legal opinion fee etc. Add all these up to get a picture of your actual cost. More importantly, understand the difference between carpet area, built-up area and super built-up area. Most builders quote the price based on super built-up area which includes common corridors and common space. What you must understand is the carpet area which is the area you will actually get to live in. This may appear to be Greek and Latin to you but if you are able to spend some basic time understanding the basics then the task becomes a lot simpler for you.