As per Vastu Shastra expert Acharya Indu Prakash, the south-west direction wall is best for the stairs in the shop. Therefore, the stairs should be constructed along the south-west wall, that is, adjacent to the wall, but keep in mind that toilets or the place of worship should not be made under the stairs.
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Many times the beam has to be made in the shop for the base. It is important to note a few things here. Keep in mind that the shopkeeper should never sit under that beam, it leads to loss of both money and intelligence. But if for some reason you have to sit under the beam, then tie a red cloth or ribbon on both sides of the beam and hang a flute on it. Apart from this, you can also cover it by installing tiles on the beam. This will help you avoid all kinds of trouble.