Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 9 · Vastu, Griha Pravesha
वास्तु गृहप्रवेशश्च
मागधं शूरसेनं च गांधारावतिका स्मृतम् ।सचतुर्भागविस्तारमुत्सेधं यत्तदुच्यते ॥ ५९५ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 595.
Then the Magadha, the Shurasena, the Gandhara and the Avantika are remembered. The rise that goes with a quarter of the breadth is called that first, the Panchala.
Simple meaning: The other four measures are named. The first has a rise of a quarter of the breadth.
पांचालमातुलानां च ह्युत्तरोत्तरवृद्धितः ।
Each roof measure rises higher than the one before it.
पांचालमानं सर्वेषां साधारणमतः परम् ।
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.