This is done before ground breaking. After purchasing the land the person have to contact their astrologer to take the muhurta for ground breaking .Then on the basis of that muhurta our Pandit Panel will do Puja and Yagya in India and in the same time the person also have to do some Puja and special things on the land ( we will guide and send instruction for that). Then they will start digging the land. Then by another Muhurta they will start the construction and on that day also Pandit panel will continue the Yagya and Puja. It is the part of Bhoomi Pujan.