Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 9 · Vastu, Griha Pravesha
वास्तु गृहप्रवेशश्च
पांचालमानं सर्वेषां साधारणमतः परम् ।अवंतिमानं विप्राणां गांधारं क्षत्रियस्य च ॥ ५९७ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 597.
The Panchala measure is common to all. After that, the Avanti measure is for Brahmins and the Gandhara for Kshatriyas.
Simple meaning: Panchala is for all. Avanti is for Brahmins and Gandhara for Kshatriyas.
कौजन्यमानं वैश्यानां विप्रादीनां यथोत्तरम् ।
Kaujanya is for Vaishyas. Houses of two or three floors take the roof slope as told.
उष्ट्रकुंजरशालानां ध्वजायेप्यथ वा गजे ।
For elephant, camel and cattle halls, use the banner or elephant point.
माघफाल्गुनवैशाखज्येष्ठमासेषु शोभनम् ।
Moving in is good in Magha, Phalguna, Vaishakha and Jyeshtha, and middling in Margashirsha and Kartika.