The main fact is the infrastructural safety is not assured by the engineers while the construction is going on. Hence building collapses have become common in the past few years.
East Delhi is prone to earthquakes due to illegal constructions and unauthorised colonies, where houses have been constructed on weak foundations.According to the civic agency officials, this illegal buildings are constructed because they are unable to get their building plans sanctioned due to strict norms, so there is a chance that government take some serious action about it.