Carpet area is the actual usable floor area within a unit's walls. Built-up area adds wall thickness and balconies to carpet area. Super area (or super built-up area) further adds a proportional share of common building spaces like lobbies and staircases.
The loading factor is the difference between super area and carpet area, expressed as a percentage — a higher loading factor means proportionally less usable space for the same quoted super area.
Since pricing is often quoted on super area, always ask for the carpet area figure specifically when comparing properties, since that is what determines actual usable living space.
