Where Vaastu comes from

The Rig Veda prays to Vāstoṣpati, the lord of the dwelling (7.54–55): be a good dwelling for us, free of sickness; be a blessing to our two-footed and our four-footed. The Vedic fire altar was built by exact geometry, and the Śulba Sūtras record how: cords, pegs, squares and their transformations. That is Vaastu's root in the Veda: a place where the sacred is given its right measure.

The systematic science came later, in the shastras of building: Varāhamihira's Bṛhat Saṃhitā (6th century) with its chapter on houses, the Mayamata and Mānasāra of the southern builders, King Bhoja's Samarāṅgaṇa Sūtradhāra (11th century), and the Viśvakarma Prakāśa. Tradition counts this knowledge as Sthāpatya Veda, the upaveda of building, attached to the Atharva Veda.

So Vaastu is Vedic in its root and post-Vedic in its books, and VEDAUM says so plainly. What the texts share is one idea: a site is a living field with a centre and directions, each governed by a devata, and a building should give each its due, beginning with light, water, fire and air placed where nature already sends them.