This is to do with specific design rules - this is the brief history :
Vastupurusa
For the basis of Hindú architecture often reference is made to Vastupurusa or “the spirit of the site”. One legend explains this as follows. There was an evil demigod (bhuta) who was born during Siva’s fight with the Asur Andhaka. This bhuta possessed a terrifying countenance and an insatiable hunger. The legend goes that having done great penance, the bhuta won a boon from Siva that allowed him to swallow the three worlds that constitute the Hindu cosmos. As this being stretched himself and began to occupy the heavens, he fell flat on the earth. The various gods and demigods seized this opportunity and pinned various parts of his body to the ground, rendering him helpless. This being came to be called Vast (or Vastupurusa) because the gods and demigods managed to lodge themselves on his body. Legends hold that the deities, in pinning him down, occupied different parts of his body and continued to reside there (Figure1). In order to satisfy his hunger, Brahma ordained that he receive offerings from people on building sites before construction.

It might be a good idea to get a local designer who is aware of Vastu laws to help with this ?! Check 'find a pro in my area'