Stairs represent Mercury and Mercury lives in the North, so why should stairs not be built in the North?
Every structure represents a planet, the roof Rahu and the stairs Mercury, but a heavy staircase in the North suppresses the North and with it Mercury. Stairs in the North cause loss of career and of magnetic attraction and end opportunities, so they are not built there.
Related questions
Are stairs made of mixed iron and plywood acceptable in the North?
Stairs should not be built in the North at all; if they must be, use wood. Many showrooms with wooden double-height staircases are found to do very well, because wood represents Mercury just as stairs and business do, so wooden stairs boost intelligence and keep business running.
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 a planet's colour (for example Mercury's) cannot be used in its zone, can the colours of its friends or of the zone element's friends be used?
First see what Mercury is in your chart (exalted, bhagyesh or lagnesh, which supports health) and where it sits. If its own colour cannot be used in that zone, use the colours of Mercury's friends, and the colours of the friends of that zone's element must also be taken.
If stairs have to be built in the North out of compulsion, how should they be made?
Leave some space in the North and build the stairs of wood, since wood also represents Mercury and is light. If a cement structure is unavoidable, leave even more space. Never make them anticlockwise or spiral: anticlockwise and rounded stairs should not be built anywhere in the house.
If the chart has Gajkesari yoga, which direction should be in good order?
The ishaan (North-East) should be correct, along with the North and the East.
My Jupiter is exalted and my door is on N6-N7, towards the North-East, yet we have had no problems. Why?
The Ishaan (North-East) corner belongs to Jupiter, so people whose Jupiter is exalted can keep their door there. This shows how the birth chart decides which door suits a person.