What is residential plot in EWS?

For a family to be considered as EWS, it should have less than 5 acres of agricultural land, a plot of less than 900 sq. ft under a municipality, a 1,800 sq. ft plot outside the municipality and a flat of less than 1,000 sq. ft area. 

Further Reading:

• EWS Reservation Eligibility
• UPSC Age Limit