Need suggestions for sinking a domestic borewell

Hi,

I am going to start my house construction but before that I am planning to sink a borewell. Water usage is for 2 houses. Can you please guide me on

1. What are the things that need to be checked before starting the work on site as well as with the contractor

2. Which methods of drilling borewell is efficient.

3. What pipes are to be used and how?

4. Cost calculations.

7. Specifications of motor to be used. 

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