Carpet Area vs Built-up vs Super Built-up: A Hyderabad Buyer's Guide
Carpet area is the usable floor space RERA makes developers sell on. Here is how it differs from built-up and super built-up area, and how Hyderabad buyers verify it.
In September 2026, a couple comparing two apartments in Kokapet found both advertised at 1,500 square feet. One was priced a little higher, so they almost dismissed it. Then they read the fine print. The cheaper flat quoted 1,500 square feet of super built-up area, while the dearer one quoted 1,500 square feet of carpet area. In usable living space the second flat was close to 20 percent larger. The same number meant two very different homes, and only the label in small type told them apart.
The short answer. Carpet area is the net usable floor area inside your flat, and under the Real Estate (Regulation and Development) Act of 2016 it is the figure a developer must disclose and sell on. Built-up area adds the thickness of your walls and balcony, and super built-up area adds a share of common spaces such as lobbies and staircases through a loading factor that has no legal cap. The trade off is clarity against comparison: carpet area tells you exactly what you can live in, while super built-up area makes a flat look larger and lets two projects quote the same headline number for very different homes.
What does carpet area mean under RERA?
Carpet area under RERA is defined precisely, which is what makes it the one measurement a buyer can rely on. Section 2(k) of the Act describes carpet area as the net usable floor area of an apartment, excluding the area covered by the external walls, areas under services shafts, the exclusive balcony or verandah area and the exclusive open terrace area, but including the area covered by the internal partition walls of the apartment. In plain terms, it is the floor you could actually cover with a carpet, counting the space taken by the walls that divide your own rooms but not the outer walls or the shafts that run through the building.
The importance of this definition is that it is uniform. Before RERA, a developer could describe area almost any way they liked, and two brochures were rarely comparing the same thing. By fixing carpet area in statute and requiring it to appear in the agreement for sale, the law gave buyers a common yardstick. When you read a project on your state RERA register, the carpet area shown there is the figure the developer is legally bound to, so it is the number to anchor every comparison and every price calculation to.
How is built-up area different from carpet area?
Built-up area is larger than carpet area because it adds the parts of your unit that carpet area leaves out, chiefly the footprint of the walls and the balcony. A rough way to picture it is that built-up area is your carpet area plus the thickness of the external walls and the balcony or verandah space that is yours alone. Because wall thickness and balcony size vary from design to design, there is no single fixed percentage by which built-up area exceeds carpet area, though a gap of roughly 10 to 15 percent is common.
Built-up area sits in the middle of the three measures, more generous than carpet area but still confined to your own unit. It is a useful figure for understanding the physical envelope of your flat, but it is not the figure RERA asks developers to price on, and it is not where the biggest surprises hide. One point worth remembering is that built-up area is rarely the number a salesperson leads with, precisely because it is less flattering than the loaded figure that follows. Those surprises belong to the third measure.
What is super built-up area and the loading factor?
Super built-up area is built-up area plus a share of the building's common spaces, and it is the figure that makes a flat sound bigger than the home you will actually live in. The common spaces loaded onto your unit can include the lobby, staircases, the lift shaft, corridors, the clubhouse and other shared amenities. The extra percentage added is called the loading factor, and it is applied to your carpet area to arrive at the super built-up area that older advertisements loved to quote.
The catch is that the loading factor has no statutory ceiling. A project with generous amenities and wide corridors carries a higher loading, so a 30 percent loading turns 1,000 square feet of carpet area into 1,300 square feet of super built-up area, while a 40 percent loading turns the same flat into 1,400. Neither is illegal, but the higher the loading, the smaller the home behind a given headline number. This is also where the idea of your undivided share of common land becomes relevant, a subject we cover in our guide to the undivided share of land in an apartment.
How do carpet, built-up and super built-up compare?
Seeing the three measures side by side is the quickest way to stop them blurring together. The table below sets out what each one covers and how a buyer should treat it.
| Measure | What it covers | How a buyer should treat it |
|---|---|---|
| Carpet area | Net usable floor area inside the flat, including internal partition walls | The RERA figure to price and compare on |
| Built-up area | Carpet area plus external walls and exclusive balcony or verandah | Useful context, not the pricing basis |
| Super built-up area | Built-up area plus a loaded share of common spaces | Inflated headline number, check the loading |
| Loading factor | The extra percentage added to carpet area to reach super built-up | Ask for it in writing, there is no legal cap |
Read from top to bottom, the table shows why the same quoted size can describe homes that differ by a fifth or more in real living space. The only line that is fixed by law is carpet area, so it is the line every other figure should be checked against.
Can a developer still price a flat on super built-up area?
After RERA, a developer is required to disclose and deal on carpet area, which means the agreement for sale and the RERA registration must state the carpet area, and the price must be tied to it rather than to a notional loaded figure. The Act was written specifically to end the practice of selling on an inflated area that buyers could not verify. In practice, you may still see super built-up area mentioned in marketing material, but it cannot be the legal basis of your purchase, and the figure that governs your agreement is the carpet area.
This is why your first stop should be the official state RERA register rather than the brochure. You can confirm the registered carpet area for a Telangana project on the Telangana RERA portal, and our walkthrough on how to verify a Telangana RERA project registration shows the exact steps. If the carpet area on the register does not match what a salesperson told you, trust the register.
How should a buyer verify area before paying?
Verifying area is a short exercise that protects you from paying premium money for common corridors. Treat the carpet area as the spine of your due diligence and work outward from it, using the checklist below before you commit any significant payment.
- Ask for the carpet area in both square feet and square metres as stated in the RERA registration and the agreement for sale.
- Cross-check that carpet area on the official state RERA project page against the figure in the builder's brochure.
- Confirm the price and the payment schedule are calculated on carpet area and not on super built-up area.
- Ask the developer to state the loading factor and how the super built-up figure was derived, in writing.
- Check that the balcony, open terrace and common amenities are described separately and not folded into carpet area.
- Match the carpet area in the agreement for sale against the figure that will appear in the final sale deed.
- For a ready flat, measure the usable floor and compare it with the stated carpet area before closing.
If you are shortlisting newer launches while you run these checks, a project listing such as Trump Towers in Kokapet is the kind of page where you should look for the registered carpet area rather than the headline size.
Frequently asked questions
What is carpet area under RERA?
Carpet area under RERA is the net usable floor area of an apartment. Section 2(k) of the Act excludes external walls, service shafts, the exclusive balcony or verandah and the exclusive open terrace, but includes the internal partition walls within your flat. It is the figure a developer must legally disclose and sell on.
What is the difference between carpet area and super built-up area?
Carpet area is the usable floor space inside your flat, while super built-up area adds the thickness of your walls, the balcony and a loaded share of common spaces such as lobbies and staircases. Because the loading factor has no legal cap, super built-up area can be 25 to 40 percent larger than the carpet area you actually live in.
Can a builder price a flat on super built-up area after RERA?
No. RERA requires a developer to disclose carpet area and tie the price and agreement to it, not to a notional super built-up figure. Super built-up area may still appear in marketing, but it cannot form the legal basis of your purchase. Always confirm the registered carpet area on your official state RERA portal.
How do I verify the carpet area of a flat before buying?
Look up the project on your official state RERA register and read the registered carpet area, then compare it with the brochure and the agreement for sale. Confirm the price is calculated on carpet area, ask for the loading factor in writing, and for a ready flat, measure the usable floor space before you close.
The lesson of the two Kokapet flats is that the number on a hoarding means nothing until you know which area it describes. Anchor every comparison to the RERA carpet area, read the loading factor with open eyes, and verify the figure on the official register, and you will buy the home you think you are buying rather than a share of its corridors.
Last updated 2026-10-05. PropNewz Team.
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