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.
Related questions
Must the house be at 0 degrees for a sarvatobhadra dwar?
By definition it is at 0 degrees with doors in all four directions, but it can be made otherwise too: build the doors on whichever pads fall on Pushpdant, Grihakshat, Bhallat and E4.
Our small house has an iron door outside and a wooden door inside. Which is the main door, and what if the inner door is on a wrong pada?
The wooden door is the main door. Iron is acceptable in the West, and an iron door in the boundary wall is acceptable. If the inner main door is on an unfavourable pada, correct it with the direction-wise bandhanwars and symbols taught in this class plus some door power. Moving it to S4 suits only if the male head of the house has Kark, Makar or Kanya rashi, because Vedic vastu judges this from the male head of the house alone, not from anyone else such as the wife.
Which planet is behind a South-South-West entrance?
If Rahu is bad, you will automatically get an SSW entrance. It has to be closed.
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 shop shutter often spans four padas, such as S3, S4, S5 and S6. Which pada decides the results?
Do not worry that S3 and S6 are also open: if the good pada, S4, is open within the shutter, the shop gives the results of S4, because when energy enters from every part, positive and negative, the result follows the positive. Trouble comes only when the good part is closed and the bad parts are open; then keep the shutter closed and open a small door on the good pada instead. In combination doors for business, always keep the favourable pada fully open.
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.