When should the vastu of the whole house be checked, and when only that of a room?
Check the whole house when the whole house is being built, and the room when only its interior is being done. Just as a person is first seen as a whole and then limb by limb, first assess the whole house and then each portion, and try to make every part good.
Related questions
For a house on the ground floor, does the energy that circulates in it come in through the ground level?
Energy behaves like materials of different specific gravity: the densest settles at the bottom, as dirt does, and the lighter the energy, the better it is. That is why ground-floor flats sell cheapest and higher flats cost more. People living on the topmost floors face the fewest vastu doshas, because the winds ventilate the space and keep the energy flowing.
Is element-based vastu applied to small homes of 70 to 90 gaj?
Small homes of 70, 80 or 90 gaj are not treated with element-based directional vastu; aay vastu is applied to them instead. Under mathematical vastu, studied later, vastu applies to homes from about 100 gaj upward.
Who is the originator (janak) of interior vastu?
Adi Brahma (Adi Prabhu) gave each son a different knowledge: Bharat received arthashastra, Bahubali kaam neeti and Ayurveda, Vrishabhsen gandharva shastra (music and instruments), and Anant Vijay all the arts of painting, colour, brushwork and artefacts. Anant Vijay is therefore the source of interior knowledge, which he spread further, and Vishwakarma received the knowledge of vastu.
About 11 or 12 of the 45 devtas are asuras. Whose energy should be increased and whose kept low to stay balanced?
This was to be explained in detail later, as there is a big confusion about it. Asura devtas are also needed: the day there are no asuras in your house, your work will not run, so the aim is balance, not removing them.
Apart from gridding the house, should the kitchen be gridded separately?
Yes. Interior vastu means zoning each room separately with its own grid and then designing its interior accordingly.
Are the quartz trees sold today good to keep?
Yes. They mostly carry natural quartz of different colours, and they are far better than plastic decor, so they can be kept as showpieces in the interior.