Carpet is the usable floor area, built-up adds walls, super built-up adds a share of common areas. Buyers are sensitive because the same flat can be quoted three ways. Quote carpet first, show the others alongside, and never let loading surface only at agreement stage. General background, not legal advice.
Section 2(k) of the Real Estate (Regulation and Development) Act, 2016 defines carpet area as the net usable floor area of an apartment, excluding external walls, service shafts, exclusive balcony or verandah area and exclusive open terrace area, but including internal partition walls. Section 4(2)(h) requires it to be disclosed at registration. The affirmative rule that units be sold on a carpet-area basis is state-level — Haryana RERA imposed it by regulation dated 7 May 2021, UP RERA by direction in January 2024. Source: Real Estate (Regulation and Development) Act, 2016 (Act No. 16 of 2016), India Code.
This article is general background for developers and is not legal advice. RERA is implemented state by state, with different rules and authorities, and the position changes. Confirm anything specific with your legal adviser and your state authority before acting.
Nothing erodes buyer trust faster than discovering that the “1,200 sq ft” flat has meaningfully less usable space than they assumed. Even when everything you said was technically accurate, the buyer’s experience is of having been managed.
The terms
Carpet area is defined in the Real Estate (Regulation and Development) Act, 2016, and the definition includes and excludes specific spaces. The Act’s definition is the one that governs disclosure obligations; the exact application to your project’s spaces should be confirmed with your legal adviser.
Built-up area conventionally adds the thickness of walls and certain other areas to carpet area. It is a market convention rather than a single fixed definition, and usage varies.
Super built-up area conventionally adds a share of common areas — lobbies, staircases, lifts and similar. The loading applied varies by developer and project, which is precisely why buyers distrust it.
Because the last two are conventions rather than uniform definitions, two projects quoting the same super built-up figure can deliver very different usable space.
Why buyers are sensitive about this
They have been told by friends, family and the internet that area figures are where developers are least straightforward. They arrive already suspicious.
That means the moment of area disclosure is not a technicality. It is a trust test, and you either pass it in the first two minutes or you spend the rest of the conversation being doubted on everything else.
How to present it well
Lead with carpet area. State it plainly, in the same units and language across every surface — site, brochure, website, portal, broker material.
Show the other figures alongside, labelled. If you quote super built-up, show carpet next to it. A buyer who has to work out the relationship assumes you did not want them to.
State the loading openly if you use one. A developer who says the loading factor out loud is immediately more credible than one who leaves it to be calculated.
Give a unit-wise area statement. Not a range for the typology — the actual numbers for the actual flat, in writing, at the visit.
Make the site experience match the paper. A buyer standing in the flat should recognise the number they were given. If it feels smaller than the figure implied, the figure was the problem.
The most common failure
Different figures circulating from different sources. The portal shows one number, the brochure another, the broker quotes a third, and the site executive gives a fourth.
Each may be a different measure — but the buyer sees inconsistency, not nuance. Publish one sheet, distribute it to everyone who speaks to a buyer, and update it centrally.
The sales upside
Developers who are unusually clear about area often find it converts. Buyers arriving suspicious of the whole category encounter straightforward numbers and relax — and a buyer who has stopped looking for the trick starts evaluating the flat.
That is a real competitive advantage in a market where the default assumption is that the number is being managed.
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Frequently asked questions
What is carpet area under RERA?
It is defined in the Real Estate (Regulation and Development) Act, 2016, with specific inclusions and exclusions. Confirm how the definition applies to your project’s spaces with your legal adviser.
Why do buyers distrust super built-up area?
Because the loading applied varies between developers and projects, so the same figure can mean very different usable space.
How should area be presented to buyers?
Carpet area first, other figures labelled alongside, one consistent sheet across site, brochure, website, portals and brokers, and a unit-wise statement in writing at the visit.