If the planet of profit sits in the 11th house in its own sign, will a South-East entrance for the office be good?
Yes, it will suit, because the lord of the house of gains is swagrahi there.
Related questions
My house entry is in the SSW and my 10th house has Sun, Mercury, Moon and Ketu with an exalted Venus; can I move the entry to the South-East?
If you open the South, open it in the good South pada (S4 as heard), and if you open the West, in the good West pada (W4 as heard). The present South-West entry should be corrected with door power.
A bungalow has a good North entry but a semi-basement in SE, SSE and the South, with its entrance from inside. What will happen?
Even with good doors, if the basement is wrong, the house gets the results of that wrong basement.
A house has its entry in the Agni kon (South-East), an underground water tank in the South-East with the stairs over it, and the slope running to the South. The family fights constantly. What is the remedy?
Either leave the house or treat it: close the South-East underground water tank immediately and correct the slope. The staircase can stay. An overhead tank in the South-East is acceptable.
Can doors be opened anywhere by vastu, or must the birth chart be checked?
Check the birth chart. If the Sun in the chart is debilitated and you forcibly open an E3 or E4 door, it will be wrong and not appropriate at all.
If a house has four members, whose kundli should be used for its vastu?
Primarily the grih swami's, the person whose money is going into the house, because the house affects the owner and his next three generations; do not go by the name the property is registered in, such as a daughter. The facing and main door are chosen from the grih swami's chart, for example North if his Mercury is exalted or his North-side planets are strong. Where a child sleeps or studies is decided from the child's own chart: if the child's Mercury is weak, seat him in the South instead of the North, following the 180-degree rule for a weak planet.
If the Ambani kitchen uses white in the South-East, why should others use ivory?
In that horoscope the Moon is exalted and forms a strong Gaj Kesari yoga, so white does not harm them; you should use ivory. A white platform alone does not make anyone rich, nor does a platform alone make anyone a pauper: vastu is not everything and nothing is greater than karma. Vastu supports those whose karma is good, and its four controlling factors are dravya, kshetra, kaal and bhaav (substance, place, time and intention).