The east portion of the house is best for constructing a bathroom. The morning rays of the Sun are believed to be extremely beneficial for health, hence proper windows should be provided in the bathroom
The slope of the bathroom floor should be towards north and east so water drains to the north-east side of the bathroom
Toilets should to be in the northwest of the house/building. Avoid constructing a toilet in the center of the building and in the northeast of the building
When it has to be an attached toilet, let it be to the northwest side of the room. The second alternative is the southeast of the building or room