Mayamatam 19.20

19.20

sārdhadaṇḍaṃdvidaṇḍaṃvā kṣudranāsyā viśālakam
pādotsedhe paṅktinandāṣṭabhāge dvārotsedhaṃ tattadekāṃśahīnam
vistāraṃ syāt tattaduccārdhamānaṃ dvāraṃ kuryāddharmyamadhye nṛpāṇām

One and a half or two measuring rods is the width of the small dormer. / When the pillar height is divided into ten, nine, or eight parts, the height of the door is less by one of those parts; / the width should be half of that respective height: one should make the door in the middle of the mansion for kings.