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.
Related questions
My main door is in the South; how should it be treated?
In interior vastu a wrong door is treated only with symbols and similar items, since the full door treatment alone would take about five classes. For South door defects the class gives bandhanwars of stone or gems, a toran of copper and wood, and a red triangular swastik bandhanwar hung on a Saturday or Tuesday. In the South only S4 is a good pada, and it suits those with Kark, Makar or Kanya rashi, mulank 9, or an exalted or own-sign Mars.
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 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 all the doors and windows of the house be made of steel?
Yes, if Saturn is exalted in your chart. The same thing that harms one person can benefit another.
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.
Can yellow mustard and gomti chakra be put at a South-West main boundary gate?
Yes, it will benefit. These two items are not limited to any direction and can be used anywhere. Put the yellow mustard in properly dug pits, because if it meets moisture and sprouts it does no good. The specific South-West gate remedy is taught separately.