Due to the increase in population and lack of land available buildings have to be constructed on small plots, and in such a situation it may be necessary to build a room underground i.e. a basement.

The north, east and north-east are ideal for basements and cellars.

Avoid basements and cellars in the south-west. A height equal to or less than the ground floor height is generally recommended. If there is the need for a cellar, the best place is the north and east of the site. Of course,  the basement is not meant for residing.

Avoid basements and cellars in the south-west. It may render the master or the eldest son weak physically and financially. Accidents are likely to occur in the family. If a basement is required for the entire space of the building, see that the floor level of the basement is uniform.  A height equal to or less than the ground floor height is generally recommended.

As per principles of vastu it is necessary to keep the level higher in the south and west than in north and east. Keeping this in view, a basement (i.e. lower portion) will be auspicious and beneficial only in the north or east portion of the plot as shown in the diagram above.

Basement should not be constructed in the central portion or in the south or west portion of the plot, because a low in these portion is harmful, causing adverse effects according to the Vaastu Shastra.

For proper light and flow of air, ventilators should be provided towards north side in the basement. Stairs or ramp leading into the basement from outside has to be from the north or east. The slope in such cases will be from north to south or from east towards west, which is, possible the passage may be given from south or west side sloping down towards north or east.