Real Estate Formula • Published on July 30, 2026 • Last updated August 09, 2026
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The saleable area quoted by developers, including proportionate common areas
Share of the super built-up area allocated to shared amenities like lobby, elevator, and parking (typically 10-45%)
Share of the built-up area occupied by walls and balconies (typically 5-20%)
Carpet Area, Built-Up Area, and Super Built-Up Area are the three RERA-defined area measures used across Indian real estate listings.
Carpet Area is the actual usable floor space within the walls of a unit, while Super Built-Up Area — the figure most often quoted in pricing — adds walls, balconies, and a proportionate share of shared building amenities.
This formula lets a buyer work backward from the quoted saleable area to the real usable space.
Super Built-Up Area includes a share of common amenities that all residents use, so builders use it to fairly distribute the cost of shared spaces like lobbies and elevators across all units — though it makes per-sq-ft comparisons harder for buyers.
Yes, under India's Real Estate (Regulation and Development) Act, developers are legally required to quote and sell based on Carpet Area in the agreement, even if marketing materials reference Super Built-Up Area.
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