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Carpet Area vs Built-up Area vs Super Built-up Area: What You're Actually Paying For

  • by- Zaid Eqbal
  • Jul 14, 2026
Use a carpet-to-built-up calculator as a quick planning check, but always confirm the final numbers against the RERA-registered project documents and the sale agreement before making a decision.
Carpet Area vs Built-up Area vs Super Built-up Area: What You're Actually Paying For

One of the most common surprises for the first time flat buyers in India is discovering that the 1000 sq ft apartment they bought does not actually give them 1,000 sq ft of usable space. That's because India real estate list property size in three different ways, carpet area, built up area, and super built area, and the price you pay is usually based on the largest of the three, while the space you actually live in is the smallest.


Carpet area is the actual usable floor space inside your flat, the area you could literally cover with a carpet wall-to-wall, excluding the thickness of internal and external walls. Built-up area adds the thickness of the walls and any balcony or utility area to the carpet area, typically making it about 10% to 15% larger.

 

Super built-up area goes a step further, adding a proportionate share of common areas like lobbies, staircases, lifts, and corridors shared across the building. This is often the number developers advertise, and it can be anywhere from 20% to 40% larger than the actual carpet area, depending on how the building is designed.

Understanding about these difference is most important. The relationship between these is captured by the "loading factor" — the percentage added on top of the carpet area to arrive at the super built-up area. A loading factor of 30%, for example, means that of every 1,300 sq. ft. you're paying for, only about 1,000 sq. ft. is actual carpet area you can walk around in.

Since RERA now mandates that developers disclose carpet area clearly in agreements, this figure is one of the most important numbers to check before signing anything, rather than relying only on the super built-up figure quoted in marketing material.

 

On top of all the about the tool which can make you work easy in seconds is a calculator that converts super built-up area to estimated carpet area (or vice versa, using the loading factor) takes the guesswork out of this. Grihik's this calculator will give results in seconds by just entering some figures you can see immediately how much real, usable space you're actually being offered. This is particularly useful when comparing two projects that quote size differently, or when checking whether a builder's loading factor is reasonable compared to typical industry ranges.

Ultimately, the number that matters most for day-to-day living is carpet area, not the larger figures used for pricing and marketing. Use a carpet-to-built-up calculator as a quick planning check, but always confirm the final numbers against the RERA-registered project documents and the sale agreement before making a decision.