Carpet area is the usable floor area inside your flat, measured wall to wall. Built-up area adds the thickness of the walls and the balcony. Super built-up area adds your share of lifts, lobbies, staircases and amenities. Since the RERA Act of 2016, builders must quote and sell on carpet area, though most still price internally on super built-up.
Key facts
- The Real Estate (Regulation and Development) Act, 2016 defines carpet area in Section 2(k) and requires every registered project to disclose it.
- Carpet area includes internal partition walls. It excludes external walls, service shafts, the exclusive balcony and the exclusive open terrace.
- Built-up area is typically 10–15% more than carpet area, depending on wall thickness and balcony size.
- Super built-up area is commonly 1.25 to 1.45 times carpet area. The gap is called loading.
- Loading factor = (super built-up − carpet) ÷ carpet, expressed as a percentage.
- Two flats quoted at the same rate per square foot can differ by several lakh in real cost if their loading differs.
What is carpet area?
Carpet area is the floor you could, in principle, cover with a carpet. The RERA definition is narrower than the everyday meaning, and the exact wording matters because it is what your agreement will refer to:
“Carpet area means the net usable floor area of an apartment, excluding the area covered by the external walls, areas under services shafts, exclusive balcony or verandah area and exclusive open terrace area, but includes the area covered by the internal partition walls of the apartment.” — Section 2(k), RERA 2016
Two things surprise buyers here. First, the internal walls count, so the carpet area is slightly larger than the sum of the rooms you would measure yourself. Second, the balcony does not count, even though you paid for it and will use it every evening.
What is built-up area?
Built-up area is carpet area plus the walls that enclose the flat and the balcony or verandah attached to it. Nobody sells on built-up area any more, but it still appears on approved plans and on the municipal records used to compute property tax, so you will meet it during registration.
The practical use of built-up area is as a sanity check. If the difference between the carpet and built-up figures in a cost sheet is more than about 15%, ask what is being counted. Thick external walls on a high-rise explain some of it. Anything beyond that usually means a large balcony or a measurement convention worth questioning.
What is super built-up area, and why is it still used?
Super built-up area, sometimes called saleable area, is built-up area plus your proportionate share of everything the building shares: the lift core, the staircase, the lobby on your floor, the corridors, the clubhouse, the gym, the generator room. A project with a 1 lakh sq ft clubhouse and a 40-floor tower loads more of that shared space onto each flat than a four-storey walk-up with a small lobby.
RERA stopped builders from selling on super built-up area. It did not stop them from pricing on it. So the sequence in most sales offices in Hyderabad, Chennai and Bengaluru is: a rate per square foot on super built-up, multiplied by the super built-up number, arriving at a total. That total is then expressed in the agreement against the carpet area. The money is identical. The transparency is not.
A worked example: the same flat, three ways
Take a 3 BHK quoted at ₹6,500 per sq ft on a super built-up area of 1,650 sq ft.
| Measure | Area | What it covers |
|---|---|---|
| Carpet area | 1,180 sq ft | Usable floor inside the flat, internal walls included |
| Built-up area | 1,330 sq ft | Carpet + external walls + balcony |
| Super built-up area | 1,650 sq ft | Built-up + share of lobbies, lifts, clubhouse, amenities |
The loading here is (1,650 − 1,180) ÷ 1,180, which is 39.8%. The headline price is 1,650 × ₹6,500 = ₹1.07 crore. Divide that by the carpet area and the real rate is ₹9,085 per sq ft of floor you can walk on.
Now compare it with a second flat quoted at ₹6,900 per sq ft on 1,500 sq ft super built-up, with a carpet area of 1,170 sq ft. It looks dearer per square foot. It costs ₹1.03 crore, has almost the same usable floor, and works out to ₹8,846 per carpet sq ft. The cheaper-looking flat is the more expensive one.
How do I calculate the loading factor?
- Ask for the carpet area in writing. Under RERA the builder has to give it.
- Take the super built-up or saleable figure from the cost sheet.
- Loading % = (super built-up − carpet) ÷ carpet × 100.
- Divide the all-in price by carpet area. That is the number to compare across projects.
| Loading | Typically found in | What to check |
|---|---|---|
| Under 25% | Older buildings, low-rise, few amenities | Lift capacity, parking, whether a clubhouse exists at all |
| 25–35% | Most mid-segment gated projects | Which amenities are built in phase one and which are promised later |
| 35–45% | High-rise towers with large clubhouses | Whether the amenity list justifies the load, and the maintenance per sq ft that follows it |
| Above 45% | Uncommon | Ask for the area statement. Something is being counted twice, or the amenity block is very large relative to the number of flats |
Does a high loading factor mean a bad deal?
Not by itself. Loading buys something real. A tower with two lifts per core, wide corridors, a 1 lakh sq ft clubhouse and landscaped podium will load more than a building with a single lift and a token gym, and the first building is nicer to live in. The 42-floor towers Urbanrise is building at The World of Joy in Miyapur and at Sky Habitat carry the kind of amenity footprint that shows up as loading; so does the 2,880-unit development at Siruseri on OMR. What matters is whether you are getting the clubhouse and the podium, or only paying for them.
Two questions settle it. Is the amenity area in the approved plan, or in the brochure only? And is the shared area shown in the project's area statement, the document that breaks the site down into saleable and common components? A builder who hands over the area statement without being chased is telling you something useful about the rest of the transaction.
What goes in the agreement?
Your sale agreement should state the carpet area, the balcony area and the share of common area separately, with the project's RERA registration number. If the agreement only mentions a saleable area, that is not RERA-compliant, and it is worth fixing before you pay the second instalment rather than after. The same figures should match the ones on the state RERA portal for that project, where the approved plans and area statements are published.
If the carpet area at handover is less than what the agreement promised, RERA gives you a remedy, and that is the entire reason the definition was written into the Act. Measure the flat at the time of possession. It takes an hour, and it is the only point at which the number stops being theoretical.
Frequently asked questions
Is carpet area the same as usable area?
Close, but not identical. Carpet area under RERA includes the area under internal partition walls, which you cannot use. If you measure each room yourself and add the figures, you will get a number a few square feet smaller than the carpet area on your agreement.
Can a builder still sell on super built-up area?
No. Since the RERA Act of 2016 came into force, registered projects must disclose and sell on carpet area. Builders may still quote a per-square-foot rate on super built-up area in the cost sheet, which is legal, as long as the agreement states the carpet area.
Does the balcony count in carpet area?
No. An exclusive balcony, verandah or open terrace attached to your flat is excluded from the RERA carpet area, and so is the area under service shafts. The balcony does count inside built-up area.
What is a normal loading factor in India?
Most gated mid-segment projects fall between 25% and 35%. High-rise towers with large clubhouses and wide common areas often run 35% to 45%. Anything above 45% is worth questioning with the project's area statement in front of you.
How do I compare two projects with different loading?
Divide the all-in price of each flat by its carpet area. That gives you the price per square foot of floor you can actually use, which is the only basis on which two projects are comparable.
Where do I verify the carpet area for a project?
On your state's RERA portal. Telangana uses tsrera.gov.in, Tamil Nadu uses rera.tn.gov.in and Karnataka uses rera.karnataka.gov.in. Search by the project's registration number; the approved plans and area statements are filed there.
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