The door should not be at the corner of the walls, but a few feet away from the corner junction. The Reason - Its preferable to have more window openings towards the North and East to allow constant sunlight through the day. Since the door is opaque, it should be placed away from the N-E corner, more to the centre.
West facing door: can be located in the left half when facing the house, that is favouring the North-West. Avoid placing a door in the right half (South-West). The Reason - Its preferable to have more window openings towards the North to allow constant sunlight through the day. It is best to avoid openings in the South-West since the Sun is in the South and West at midday and in the afternoon.
If a house has a main entrance in the West it should have a corresponding door in the East also. The Reason -To allow maximum, useful UV rays found in the morning sunlight, into the house, since it is beneficial for health of the inamtes. (vitamin D synthesis)
South facing main door: must not be in the center of the building but should be in the right half when facing the house, that is more towards the South-East. Avoid placing a door in the left half (South-West). The Reason – It is always preferrable to have few openings in the South-West as explained above, since the hot infra-red rays of the afternoon sunlight are projected, maximum towards this direction.
If a house has a main entrance in the South there should be one more corresponding to it in the North direction also. The Reason – To allow the constant light from the North into the house.