When to Perform Vastu Poojan of the 45 Devtas
Vastu poojan is done not only at the start of construction but at several stages and family events; at griha arambh and griha pravesh it is essential.
What it does
Keeps the Vastu Purush and devtas honoured, preventing the defects that arise when they are forgotten.
When
Bhoomi poojan, threshold installation, slab casting, griha pravesh, after renovation, before a marriage and after sutak-patak
Cautions
Explanation and notes
In the full Vastu pooja the lord of the East is named first and arghya is offered to him in the East, with the words Bho Indra Vastu Dev Vastu Shanti Kuru Kuru. Any pooja is an offering of feelings (bhav); what matters is the bhav offered, not whether paan or gud could be offered.
During the battle with Andhakasur a drop of sweat fell to the earth and produced a being whose rampage made the earth shake. Brahma had him lie face down and promised that he would be worshipped with offerings and that not an inch of land would be built on without remembering him.
Every house, however small, carries the Vastu Purush's eyes, nose, ears, hands, feet, heart, navel and other parts, including the marma and ati-marma (vital) points. A column, pit or stud on these points harms the occupants, just as a speck of dust in the eye or an injury to a vital organ harms the body.
In the Jain account, during the bhog bhoomi of the third era kalpavriksha trees granted every wish, until rising sin made them stop giving. Adi Prabhu then taught the six means of livelihood, asi, masi, krishi, vidya, vanijya and shilpa, and gave the complete knowledge of Vastu to his fourth son Vishwakarma.
Vastu knowledge passed by memory until it was written down in texts such as Samarangana Sutradhara, Mayamatam, the Skanda, Agni, Vayu and Garuda Puranas, Vishwakarma Prakash, Aparajita Prichha, Praman Manjari, Vastu Rajvallabh, Prasad Mandan, Vastu Mandan and Shilpa Ratna, each with its own focus.
Start with Vishwakarma Prakash, the simplest, available in Hindi with the Sanskrit shlokas and their meaning (translated by Krishna Kumar Jugnu of Udaipur). Then read Mayamatam, both parts of Samarangana Sutradhara, Manasara and Raj Vallabh.
Raj Vallabh states that a temple with a large river flowing to its South becomes not merely a tirth but a mahatirth, because for a temple the water element stands for peace. Rules made for homes must not be applied mechanically to temples.
Vastu results depend equally on four factors: dravya (the money used), kshetra (the land), kaal (the muhurta) and bhav (the feelings of the builders and residents). A perfectly planned house still fails if any one of them is wrong.
Before construction of a house or factory begins, the muhurta for the shilanyas or start of work is fixed from the rashi of the owner. If the Moon falls 4th, 8th or 12th from his rashi, money stays short however good the Vastu and the door.