How much houseing loan available from bank

First of all Housing loan is not available over plot/land, unless you submit construction plan of any residential unit over it.

Secondly, loan is sanctioned about 75% if the aggregate value of plot along with construction cost (FMV needs to be evaluated)

Thirdly, it is subject to your earnings of last 3 years' average; and not over turnover.

According to everyone, does each bank have a different interest rate or are they all the same?

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Marginally different for each product.

It differs widely with different loan category.