is vasthu sastra from vedas.

 is vasthu sastra from vedas.

Vasthu Sastra is from Atharva Veda.

A section called Sthapatya Veda explains everything about vasthu sastra.

here the term Sthapatya means anything related to construction or an establishment of physical structure. 

veda is knowledge. knowledge of construction is called Sthapatya Veda.