Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 9 · Vastu, Griha Pravesha
वास्तु गृहप्रवेशश्च
पित्तवाग्रजदेहस्यात्पश्चिमे दक्षिणे तया ।गृहपादागृहस्तंभाः समाः शस्ताश्च नासमाः ॥ ५९२ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 592.
Posts and pillars of the house are praised when even in number, not odd. (Our text is unclear here: the first half of the verse, which names the west and the south.)
Simple meaning: Houses should have an even number of posts and pillars.
नात्युच्छ्रितं नातिनीचं कुड्योत्सेधं यथारुचि ।
Make walls neither too tall nor too low. Use the same thinking for upper floors.
गृहादीनां गृहश्रावं क्रमशोऽष्टविधं स्मृतम् ।
Roof slopes come in eight kinds, named after lands. Four are named here.
मागधं शूरसेनं च गांधारावतिका स्मृतम् ।
The other four measures are named. The first has a rise of a quarter of the breadth.