First entry into the newly built or bought house) is a very important aspect of Vastu Shastra and it has to be dealt accordingly. After the house is complete in all respects, living in that house is to be started at some auspicious moment determined on astrological considerations. The first entry in the house at the auspicious moment is called Griha Pravesh ceremony.
This puja is recommended and is way to bring peace and happiness in the house as well as to promote wealth and good business in your Home or Company. Three types of Griha Pravesh have been mentioned in the shastra:
(1) Apurva – First entry to live in house newly constructed on a newly selected land is called Apurva (new) Griha Pravesh.
(2) Sapurva – Entry into an already existing house to live in it after traveling abroad or migration elsewhere, is called Sapurva Griha Pravesh.
(3) Dwandwah – Entry into a house to live in it after reconstruction/renovation of the house damaged by fire, flood waters,electricity,wind etc. is termed as Dwandwah (or old) Griha Pravesh.
Griha Pravesh Puja contains: Ganesh Puja, Navagraha Puja,Griha Pravesh/Homa or Vastu Shanti/Homa worship of the Vastu Purusha . The residents of the building should then circumambulate the building. Then puja should be done to the threshold.