Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 9 · Vastu, Griha Pravesha
वास्तु गृहप्रवेशश्च
चराह्वयो वास्तुपुमान् चरत्येवं महोदरः ।यद्दिङ्मुखो वास्तुपुमान् कुर्यात्तद्दिङ्मुखं गृहम् ॥ ५६९ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 569.
The Vastu man, called Chara, moves in this way. He is Mahodara. Whichever way the Vastu man faces, one should make the house face that way.
Simple meaning: Make the house face the same way as the Vastu man faces.
प्रतिकूलमुखं गेहं रोगशोकभयप्रदम् ।
A house facing against the Vastu man can bring illness, sorrow and fear.
वृत्येटिका स्वर्णरेणुधान्यशैवलसंयुतम् ।
Place a brick with gold dust, grain and moss in a pit in the middle of the house.
वस्त्वायामदलं नाभिस्तस्मादध्यंगुलत्रयम् ।
Fix the peg at the belly point of the plot. It makes sons and grandsons grow.