Kautilya's Arthashastra 3.8.5

3.8.5

abhūtaṃ vā parakuḍyād apakramya dvāv aratnī tripadīṃ vā deśabandhaṃ kārayet //

The fastening of the roof of a house to the transverse beam by means of iron bolts is called setu (karna-kílaya- sabandho’ nugriham setuh). In conformity to the stability of the setu, houses shall be constructed. Not encroaching upon what belongs to others, new houses may be constructed.

Foundation (pade bandhah) shall be 2 aratnis by 3 padas. Except in the case of temporary structures for the confinement of women for ten days, all permanent houses shall be provided with a dunghill (avaskara), water course (bhrama), and a well (udapánum). Violation of this rule shall be punished with the first amercement.