Carpet Area vs Super Built-Up Area: What a Bengaluru Buyer Pays For

A Bengaluru buyer sees a flat advertised at 1,500 square feet for 1.8 crore rupees and does the quick mental maths: 12,000 rupees a square foot, which sounds fair for the locality. What the brochure does not say in the same large type is that the usable carpet area is closer to 1,050 square feet. On that number, the real rate is about 17,000 rupees a square foot. Nothing dishonest has happened, but the buyer has been comparing the wrong number, and that is the single most common way people misjudge value in a flat purchase.

The short answer. Carpet area is the net usable floor space you actually get, defined by the RERA Act, while super built-up area adds your share of lobbies, lifts and corridors and is the bigger number used in marketing. By law, the price in your agreement must be based on carpet area. The trade-off to understand: a flat with a lower super built-up price per square foot can be the more expensive home once you convert both to carpet area, so always compare on carpet.

What does carpet area actually mean under RERA?

Carpet area is the net usable floor area of the apartment, as defined in Section 2(k) of the RERA Act. It excludes the external walls, the area under service shafts, and the exclusive balcony, verandah and open terrace areas, but it includes the area of the internal partition walls within the flat. In plain terms, it is close to the space you could lay a carpet on, plus the internal walls. Before RERA there was no statutory definition, which let different builders include shafts, lift wells and other spaces as they pleased, so two quotes were rarely comparing the same thing. The definition is why carpet area is now the honest basis for comparison.

Common areas such as the lobby, the lift and the staircase are not part of carpet area. They reappear in the larger super built-up figure, which is where the confusion starts. The definition also settles some long-running disputes. Because the Act specifically excludes exclusive balconies and open terraces from carpet area, a builder cannot quietly fold those into the carpet number to inflate it, and because it includes internal partition walls, the carpet figure reflects the flat as actually built rather than an idealised empty box. For a buyer, the value of the definition is that it is the same across every registered project in the country, so a carpet area in one brochure means the same thing as a carpet area in another.

How do carpet, built-up and super built-up differ?

They are three concentric measures, each larger than the last. As Brigade Group's guide to these terms describes them, built-up area is the carpet area plus the walls and balcony, usually a little larger than carpet, and super built-up area, also called the saleable area, is the built-up area plus a proportionate share of common areas such as lobbies, lifts, staircases and shared amenities. Super built-up is the number you most often see on a hoarding, because it is the biggest and makes the per-square-foot price look lowest. Carpet is the number you live in. Keeping the three straight is the foundation of reading any flat quote correctly.

What is the loading factor, and how do I read it?

The loading factor is the gap between super built-up and carpet area, expressed as a percentage of carpet. The formula is the super built-up area minus the carpet area, divided by the carpet area, times 100. By Brigade's example, a flat with 1,200 square feet carpet and 1,500 square feet super built-up carries a 25 percent loading. Typical residential loading runs around 20 to 40 percent, and figures above roughly 50 to 60 percent are worth questioning, because there is no official cap and an unusually high loading means you are paying for a lot of common space relative to your own. When a builder quotes a loading factor of 1.20, that simply means 20 percent has been added to the carpet area to reach the saleable figure.

The practical use of the loading factor is conversion. Once you know it, you can turn any super built-up quote back into carpet area and compare projects on a like-for-like basis. It also tells you something about the building itself. A higher loading usually reflects more generous common areas, wider corridors, bigger lobbies and more amenities, which some buyers value and others would rather not pay for. There is no single right loading; the point is to see it clearly and decide whether the common space you are funding is worth the premium, rather than discovering the gap only after you have signed. Two flats with identical carpet areas can carry very different super built-up figures purely because one sits in an amenity-heavy tower.

Why does the pricing basis matter so much?

Because the same total price looks very different depending on which area you divide it by, and the bigger super built-up number always flatters the rate. Brigade's guide states the rule plainly: by law, the price of an apartment must be based on carpet area, not super built-up area, and builders must clearly state the carpet area. A flat advertised at a lower rate on super built-up can work out more expensive per usable foot than a flat with a higher headline rate but a lower loading. This is not a small difference; across a typical loading range it can shift the effective rate by a third or more. So the comparison that protects you is price per carpet square foot, not price per super built-up square foot. A simple discipline helps: whenever a sales team quotes a rate, ask whether it is on carpet or on super built-up, and convert everything to carpet before you compare. The builder who leads only with the super built-up figure and resists giving a carpet rate is telling you something, and it is worth insisting on the carpet number in writing.

How do I check the real numbers before I sign?

You confirm the carpet area in writing and on the RERA listing, then compare every shortlisted flat on carpet. The steps below turn that into a routine you can run on any project.

1. Ask the builder for the carpet area in square feet, in writing, for the exact unit.
2. Look up the project on your state RERA portal by its registration number and read the disclosed carpet area.
3. Confirm the RERA carpet area matches the figure the sales team gave you for that unit.
4. Calculate the loading factor from the super built-up and carpet figures to understand what you are paying for.
5. Divide the total price by the carpet area to get the true rate per usable square foot.
6. Compare that carpet rate across every shortlisted flat, not the super built-up rate.
7. Make sure the sale agreement states the price on carpet area before you sign.

How do the three measures stack up for a buyer?

The table below sets the measures side by side with a worked example on a flat with 1,200 square feet carpet and a 25 percent loading. Use it to see why the basis you compare on changes the picture.

The place this all lands is the agreement you sign, which is why the carpet area and the price basis belong on your checklist for that document. Our guide to the clauses to read in a builder-buyer agreement covers where the carpet area and pricing basis should appear and what to do if they do not. And because the carpet figure also drives the value your duty is charged on, it sits alongside the costs set out in our guide to stamp duty and registration charges in Bangalore. When you compare two projects, say a high-loading tower against a listing like Century Midtown, the carpet rate is the only number that lets you judge them on the same terms.

Frequently asked questions

What is carpet area under RERA?

Carpet area is the net usable floor area of an apartment as defined in Section 2(k) of the RERA Act. It excludes the external walls, service shafts, and exclusive balcony, verandah and open terrace areas, but includes the internal partition walls. Common areas such as the lobby, lift and staircase are not part of carpet area.

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 your proportionate share of common areas such as lobbies, lifts and staircases. Super built-up is the larger, saleable number used in marketing. The gap between them, as a percentage of carpet, is the loading factor.

Does RERA require pricing on carpet area?

Yes. By law the price of an apartment in the agreement must be based on carpet area, not super built-up area, and the builder must clearly state the carpet area. The carpet area is also disclosed on the project's RERA listing, so you can cross-check the figure the sales team gives you before you sign.

What is a normal loading factor in Bengaluru?

Residential loading typically runs around 20 to 40 percent of carpet area, with amenity-heavy luxury projects sometimes higher. There is no official cap, so a loading above roughly 50 to 60 percent is worth questioning, because it means you are paying for a large amount of common space relative to your own usable area.

The short version: compare flats on price per carpet square foot, confirm the carpet area on the RERA listing, and make sure the agreement prices on carpet. The marketing number is the one designed to look good, not the one you live in.

Last updated 2026-10-08. PropNewz Team.