If the North of a flat or house is polluted, for example by a toilet, should we advise removing it, and is a pooja needed afterwards?
Yes, advise removing it: the North is Kuber's place, and keeping filth at the place of wealth is like putting dirt in the mouth, so wealth cannot grow. After any demolition do a Vastu pooja; even a short one is enough, offering 45 small pieces of gud to the 45 devtas or invoking the nine lords with Bho Indra Vastu Dev Vastu Shanti Kuru Kuru and so on for each direction, with Brahma at the centre.
Related questions
A relative's flat had its door at E1. After buying the adjoining flat and removing the common wall the entrance came onto N4, and soon their ancestral land was acquired for a bullet-train project and they received crores. Is this the N4 effect?
Yes, this is chhappar phaad wealth, which comes as soon as N4 opens. E3, N4 and W4 are the three vipul sampada dwar (abundant-wealth doors). Opening them virtually gives perhaps 1 percent of the actual result, so do not believe the heavy promotion of virtual doors; it is the actual opening that brings the result.
Does the tijori zone also apply inside a room, and which way should the tijori face?
Keep the tijori in the zone given for it and make it face North. A room in the SW, say 12 by 15 feet, is entirely SW, not only its corner; it has four walls, so keep the tijori against the South wall and it will face North.
If only a bathing area is in the North and the WC is removed, is that fine?
Yes, absolutely. A room used only for bathing is fine in the North or the East; the East is the ideal place for bathing.
If the plot is tilted so that a North-facing toilet seat actually faces NNE, will it work?
Yes, it will work. A slight tilt is acceptable; it is a treatment in any case.
In a three-floor building our North toilet was removed, but the upper floor's toilet is still above our North; does it affect us?
It falls under surrounding (assisting) vastu and affects you about 10 percent. Its energy can be treated and blocked if you can reach it. Do not build a temple in that North spot; at least never keep God beneath a toilet seat.
Is vastu poojan done only when construction starts?
No. Do it at bhoomi poojan or shilanyas, when the first slab is laid, when the main door frame is installed and on griha pravesh; the start of construction and griha pravesh are essential. Also do it after a renovation in which walls are broken, for a marriage, the start of a job or business and the birth of a child, and once a year on a swayam siddh muhurta such as Akha Teej or Gudi Padwa for a year of happiness and peace.