Garudapurana 1.46.29

1.46.29

yaccheṣaṃ tadbhavejjīvaṃ maraṇaṃ bhatahāritam /
vāstukroḍe gṛhaṃ kuryānna pṛṣṭhe mānavaḥ sadā //

whatever the remainder, that will be life; death is [determined] by dividing by the asterisms.
A person should always build a house in the lap of the site[-deity], never on his back;