Carpet area vs super area: why the difference matters
"2,690 sqft" looks like a simple number. It is not. Depending on which definition the developer uses, "2,690 sqft" can mean anywhere from 1,200 to 2,200 sqft of actual usable floor inside your apartment. The gap is not a typo or a marketing exaggeration — it is the difference between carpet area, built-up area and super area, three legally different concepts that are often used interchangeably by buyers and deliberately blurred by marketing brochures.
This guide lays out exactly what each term means, how the Real Estate (Regulation and Development) Act standardised them, why the "loading factor" matters, and how to read the area callout on any brochure without being misled.
The three-layer definition
Carpet area
Carpet area is the internal usable floor area of your apartment, measured wall-to-wall inside the unit. It excludes the thickness of the external walls, but includes internal partitions. Bathrooms, kitchens and utility balconies are included. Open balconies and external shafts are generally excluded, though RERA permits "exclusive balcony area" to be reported separately. This is the usable area — the number you should be comparing between units.
Built-up area
Built-up area = carpet area + thickness of the external walls of your unit + area of your private balconies. It is typically 10-15% more than carpet area. Built-up area is a construction concept rather than a usability concept — it tells you how much plinth you occupy on the floor, including the masonry that encloses you. For a buyer, built-up area is less useful than either carpet or super area.
Super area (also called "super built-up area")
Super area = built-up area + your proportionate share of common areas in the tower. Common areas include the lobby, staircase, lift shafts, corridor, service shafts, pump room, fire refuge floor, and sometimes the amenity block. Super area is always the largest of the three numbers. The "loading factor" — the percentage increase from carpet to super — ranges from 20-25% in well-planned luxury projects to 40-50% in older, less efficient projects.
What RERA changed
Before RERA (Real Estate Regulation Act 2016), developers in India had wide latitude in how they defined and reported area. Different projects used different definitions; some super area calculations included the pool deck and the clubhouse garden. RERA standardised this:
- Every RERA-registered project must publish carpet area for every unit type
- Price in the RERA-mandated agreement to sell must be linked to carpet area, not super
- RERA defines carpet area precisely — the net usable floor area excluding external walls, service shafts, balconies and open terraces
- Developers must disclose all area types on their RERA filing — any discrepancy is a compensable offence
- Buyers have legal standing to demand verification measurements at possession; if actual carpet is less than RERA-declared, proportional refund is payable
In practice, most developers continue to quote super area in marketing brochures and price per sqft on super area — but the legal contract is anchored on carpet. Always ask for both numbers before booking. See our glossary entry on the RERA Act.
Loading factor — the single most important ratio
Loading factor = (Super Area − Carpet Area) / Carpet Area × 100%. It tells you how much of what you are paying for is not inside your apartment. A low loading factor means a more "efficient" floor plate; a high loading factor means a larger share of common area — which can be good (grander lobbies, wider corridors) or bad (wasted circulation you did not ask for).
| Loading factor | What it signals |
|---|---|
| Under 20% | Very efficient — typically older buildings or affordable stock with minimal amenity |
| 20-30% | Well-planned mid-to-premium — balanced common areas, functional corridors |
| 30-40% | Luxury range — grand lobbies, clubhouse inclusion, AQI-managed zones, fire refuge floors |
| Over 45% | Suspicious — either very amenity-heavy (fair) or aggressive super-area accounting (unfair). Investigate. |
Price per sqft — super vs carpet
The same unit's price looks very different depending on which area you divide by. An apartment with a super area of 2,690 sqft and a carpet area of 1,700 sqft has a loading factor of 58%. If the price is (hypothetical) ₹2.7 crore, the price "per super sqft" is ₹10,037. The price "per carpet sqft" is ₹15,882. Same apartment, same money, two very different-looking numbers.
Both numbers are valid. Super-area-based pricing is how most of the Indian luxury market quotes. Carpet-area-based pricing is how RERA agreements are structured. To compare two projects fairly, convert both to the same basis. The rule: always compare carpet-to-carpet, not super-to-super, because super-area definitions drift between developers while carpet is standardised.
Why super area is not "wasted"
Buyers sometimes react to a high loading factor by saying they are "paying for something they do not use." This is only partially true. The common areas covered in super area include things you do use every day: the lift, the lobby, the power back-up, the fire safety system, the amenity block, the landscape corridor. In a luxury project, these common areas are often the difference between a building that feels premium and one that does not. The point is not to avoid super-area loading — it is to understand what you are paying for.
- Grand lobby with double-height ceiling and concierge — adds 3-5% to loading factor, improves every entry and exit to the building
- Wide corridors on each floor — adds 1-2%, every move-in and every piece of furniture that ever enters the unit benefits
- Fire refuge floors as mandated by code — non-negotiable, adds a couple of percent, genuine safety value
- Clubhouse share — adds 5-8%, used a few times a week or rented to guests — this is the most debated inclusion
- Amenity block share — pool, gym, games room — usually 3-5% of loading, pro-rated across all residents
The Forbes Fab Luxe area disclosure
At Forbes Fab Luxe Residences, the 3BHK+Study is disclosed at 2,690 sqft super area and the 4BHK+Study at 3,307 sqft super area. RERA-declared carpet area for each type is published separately. The loading factor sits in the luxury-segment range, reflecting the grand lobby, the AQI-managed circulation zones, the clubhouse block, and the fire refuge floors built into the G+35 tower design. For exact numbers, see the floor plans page.
Five practical checks before booking
- Get carpet, built-up and super for the specific unit in writing. Not the "type" — the specific unit, because corner units and dual-aspect units can have slightly different numbers.
- Calculate the loading factor yourself. Compare to the project's peer set.
- Walk the common areas the loading factor is paying for. The lobby, the clubhouse, the amenity block. You should feel they justify the loading.
- Ask what counts as "exclusive balcony area" vs carpet. Some developers fold balconies into carpet; most do not. This affects the reported number.
- Cross-check the RERA filing on the state RERA portal. The filing is the source of truth.
Three red flags to walk away from
- Developer will not disclose carpet area separately. Mandatory under RERA; refusal is a material red flag.
- Loading factor above 50% with no clear justification. Either you are being sold common areas you will not use, or the super-area calculation is aggressive.
- The agreement to sell references "super area" as the basis, not carpet. Non-compliant with RERA; the agreement should be re-drafted.
Want the carpet, built-up and super for a specific unit?
We can pull the RERA-filed numbers for any Fab Luxe configuration.
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