Steps to Follow for constucting new house

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Hello,

I would like to know from start to end what things I need to do to start constructing a house on a 30/40 SOUTH FACING site.

My intention is to build a house with a carpark and 2bhk on ground floor for rental and first and second floor for own use a 3/4 bhk duplex house.

Let me know what would the approximate budget I need to have for this many squares of construction.

Regards,
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