Hello Ruchi,
Very first thing a single fault will not impact the dwellers.
Remidies
1. Create openings in the stair case as much as possible.
2. Increase load in the SW zone of the Bhavan (House).
3. Create a Pit under the stair case and clad it with White marble.
Either of the about remedy should help to balance the energies. Also a plan of the house will definately help to understand more regarding your query.
Regards.
Pavan Matkar
Wastu Wimarsh