Should all the rooms of a house, apart from the bathroom, be at the same level?
Yes, all rooms should be at one level. A slope toward the North-East causes no problem, because the earth itself is tilted about 23.4 degrees toward the North-East and following nature counts as level; a slope in any other direction causes trouble.
Related questions
Many people build the North-East part of the floor about a foot lower. Is that right?
Yes, lowering the floor level in the North-East causes no problem.
Don't termites attack mud walls?
Not because they are mud: termites attack wood and cement walls as well. Termites come wherever negativity settles, and injecting mercury into the ground keeps them away. Mud is the strongest adhesive, and a room built with mud in place of cement mortar, especially in the North-East, holds the most energy and removes many North-East doshas.
How is the shape of a plot or building determined?
From the foundation: the outline of the foundation and plinth beam of the outermost walls, joining all the corners into a square, rectangle or other form. The geopathic current under the ground runs in that shape, so projections above ground do not change it, while an irregular foundation stays irregular even if right angles are built above it.
If the slope should go to the North-East, should it run from the West toward the North-East?
Yes. Everywhere, the slope should run from the West toward the North-East, the East or the North.
Is a nahar mukhi (lion-faced) plot auspicious if it extends toward the South so that its South-East grows?
No. A South-East or South-West extension is not auspicious, because a plot needs its North-East extended. Even in an East-facing gaumukhi plot with a narrow front where the South-East is a right angle, the North-East gets cut, so it is not auspicious. A nahar mukhi plot gives results only when its North-East is extended.
Some people deliberately build the house with the North-East extended. Does that increase the energy?
Yes. Extending the North-East of the land from the foundation enlarges the place of its devta, who is pleased just as a person is with a bigger room, and it does not bring a South-East negative. But what truly counts as an extended North-East is taught later, because many people extend it the wrong way, for example from the East toward the North-East, and harm themselves.