The usable floor area inside a flat's walls: rooms, kitchen and bathrooms, without outer walls, shafts, balconies or terraces.
Guide
Three numbers describe the same flat and only one of them is floor you can stand on. How they differ, and which to ask for first.
It is the one area figure with a legal definition, in the RERA Act, so it is the number to compare between flats. Ask for it in writing and check it against the project's RERA registration.