Homam or havan is the offering of different types of poojas to various deities for fulfillment of wishes by welcoming the power of Agni, The Fire of God. These are performed to bring peace, prosperity and success in homes or offices. The Vastu Homam is one such sacrifice performed, usually before shifting into a new home or office. This is a ritual dedicated to the direction gods. They are namely, Indra (east), Agni (south-east), Yama (south), Pitru (south-west), Varuna (west), Vayu (north-west), Kuber (North) and Brahma (center). Each god is a symbol of some elements such as fire, thunder, peace, prosperity, etc.
The Vastu Puja originated long back
Vastu is the modern science of construction. This is a term used in Hindu architecture where it is believed that alignment, directions and designs play a great role in bringing the good energy inside a building. The foundation of this pooja is said to have been done by a mythical sage named Mamuni Mayan. The Legend of Vastu Purusha says that once a formless was blocked by Brahma and other gods, and this is graphically depicted in the Vastu Purusha Mandala. From this diagram, the positions of various elements of Earth were distributed in a concentric pattern. In this pattern, Lord Brahma gained the central position.