A Gachibowli buyer sat across from a sales manager last quarter, staring at two numbers for the same flat. The brochure said 1,450 square feet. The RERA registration page said 1,040. Nothing had shrunk. The two figures were simply measuring different things, and the gap between them is the single most misunderstood number in an Indian home purchase. If you are shopping for an apartment in Hyderabad, understanding carpet area, built-up area, and super built-up area is the difference between knowing what you are buying and guessing at it.

The short answer. Under the Real Estate (Regulation and Development) Act, 2016, the area that legally matters is the carpet area, defined in Section 2(k) as the net usable floor area inside your walls. Super built-up area adds your share of common spaces such as lobbies, staircases, and lifts, so it is always larger and is a marketing figure, not the legal one. The trade off is simple. A big super built-up number looks generous on a brochure, but you live inside the carpet area, so ask for the carpet figure in writing before you compare prices or sign anything.

What exactly is carpet area under RERA?

Carpet area is the net usable floor area of your apartment, and RERA gives it a precise legal meaning. Section 2(k) of the Act defines it as the net usable floor area of an apartment, excluding the area covered by external walls, areas under service shafts, and any exclusive balcony, verandah, or 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, plus the thickness of the walls that divide your own rooms.

The reason this definition was written so carefully is history. Before RERA, developers across the country quoted whatever area figure flattered the price, and buyers had no standard to push back with. By fixing one definition in the statute, the law gave every buyer the same yardstick. When you read a project's registration on the Telangana RERA portal, the carpet area shown there is the number the promoter is legally bound to, which is why it is the figure worth trusting.

It is worth being clear about what carpet area is not. It is not the built-up area, and it is certainly not the super built-up area that dominates most brochures and price lists. A common mistake is to assume the big number on the marketing sheet is the flat's size in any legal sense. It is not. The only size the promoter has declared to the regulator is the carpet area, and if a dispute ever arises about what you were sold, that declared figure is the one that will be tested against reality.

How do built-up and super built-up area differ?

Built-up and super built-up area both sit on top of carpet area, and each adds something extra. Built-up area takes your carpet area and adds the space taken by the walls themselves and usually the balcony, so it runs larger than carpet area. Super built-up area goes further, adding your proportionate share of the building's common areas, which can include the lobby, staircases, lift shafts, corridors, and sometimes amenity spaces. Because it loads in space you share with every other resident, super built-up area is always the biggest of the three.

The extra space folded into super built-up area is often described as the loading factor. The exact percentage is not fixed by law and varies from project to project depending on how generous the common areas are, so treat any loading number a salesperson quotes as project specific rather than a rule. What does not change is the direction of the effect. The higher the loading, the more the headline size overstates the space inside your own front door.

Which number should you pay on?

You should always anchor your comparison to carpet area, because that is what RERA makes the promoter disclose. Section 4 of the Act requires the promoter to state the carpet area when applying to register the project, and the same carpet figure runs through the sanctioned disclosures and the buyer agreement. When two projects quote a price per square foot, they are only comparable if both are quoted on the same basis. A rate that looks cheap on super built-up area can be more expensive per usable foot than a rate that looks dear on carpet area.

The clean way to compare is to convert everything to a price per carpet square foot. Take the total price and divide it by the carpet area, not the super built-up area, for every option you are weighing. Do this and the flat that seemed a bargain sometimes turns out to be the pricier one once you strip out the shared corridors you were quietly paying for.

Why does the gap between the numbers matter so much?

The gap matters because it decides how much real living space your money buys. Two flats can carry the same super built-up area and the same price, yet one can give you noticeably more usable room because its loading is lower. Since you cannot put furniture in a lift shaft or a shared lobby, the carpet area is the only figure that maps to daily life, from where the sofa goes to whether the second bedroom is genuinely a bedroom.

There is a resale angle too. A buyer who later sells will find that informed purchasers increasingly ask for the carpet area first. A flat with efficient carpet area for its price is easier to explain and easier to sell, while one carrying a heavy loading can be a harder story to tell down the line.

Consider a simple illustration. Suppose two apartments both advertise 1,400 square feet of super built-up area at the same headline price. One delivers 1,050 square feet of carpet area and the other delivers only 950. On paper they look identical, yet the first gives you a hundred square feet more of real room for the same money, which is roughly the footprint of a small study or a generous utility. Nothing on the brochure tells you this. Only the carpet figure does, which is exactly why the law pushes it to the front and why a careful buyer should too.

How do you confirm the carpet area before you buy?

Confirm it from the RERA record, not the brochure. Every registered project in Telangana carries its declared details on the state RERA portal, and the carpet area listed there is the promoter's legal statement. Cross check that portal figure against the carpet area written into your agreement, and make sure the two agree before you sign. If a sales team only ever shows you the super built-up number, ask them in writing for the carpet area, and treat reluctance as a signal to slow down.

It also helps to walk the actual flat or a sample unit with the floor plan in hand. If the plan marks dimensions, a quick multiplication room by room gives you a rough sense of whether the stated carpet area is believable. You are not trying to match it to the last square foot, only to catch anything wildly off.

Your seven step area verification checklist

1. Ask for the carpet area in writing, not just the super built-up figure.
2. Open the project's Telangana RERA registration and note the declared carpet area.
3. Check that the agreement's carpet area matches the portal figure.
4. Divide the total price by carpet area to get a true price per usable foot.
5. Compare every shortlisted flat on that same per carpet foot basis.
6. Ask how balconies and common areas are treated in the quoted size.
7. Walk the unit or a sample with the floor plan to sanity check the number.

Frequently asked questions

Is a flat in Hyderabad sold on carpet area or super built-up area?

RERA makes carpet area the legally disclosed figure, defined in Section 2(k), and it is the number the promoter must state on the registration and in your agreement. Super built-up area is a marketing measure that adds shared common spaces. Always compare and pay on the carpet basis, and ask for that figure in writing.

What is included in RERA carpet area?

Carpet area is the net usable floor inside your apartment, including the internal partition walls that divide your rooms. It excludes external walls, service shafts, and any exclusive balcony, verandah, or open terrace. In short, it is the space you can actually use and furnish, which is why RERA fixed it as the standard measure.

Why is the super built-up area larger than carpet area?

Super built-up area adds your proportionate share of common spaces such as lobbies, staircases, lifts, and corridors on top of the built-up area. That extra load is why it is always the biggest of the three figures. The size of the load varies by project and is not fixed by law, so treat any quoted percentage as project specific.

How do I verify the carpet area of a project?

Open the project's registration on the Telangana RERA portal and read the declared carpet area, then check it against the carpet figure in your buyer agreement. The two should match. If a sales team only shows the super built-up number, ask in writing for the carpet area before you commit any money.

For more Hyderabad buyer reading, see our guide on how to verify a project's Telangana RERA registration, and if a builder has already broken a disclosure, our walkthrough on how to file a RERA complaint in Hyderabad. The carpet area definition referenced here comes from Section 2(k) of the Real Estate (Regulation and Development) Act, 2016.

Last updated 26 July 2026. PropNewz Team.