Carpet, built-up and super area: what you actually pay for

Walk into any sales gallery in NCR and you will hear three numbers for the same flat: a carpet area, a built-up area and a super area. They can differ by 40% or more, and the price per square foot quoted to you almost always uses the largest of the three. Understanding what each number measures is the single cheapest piece of due diligence a buyer can do.

The three areas, defined

Carpet area is the net usable floor area inside your walls — the space a carpet could physically cover. It includes internal partition walls of the unit but excludes external walls, service shafts, the balcony and the common lobby. Built-up area adds the external walls of your unit and, in most builder definitions, the balcony and terrace. Super area (or saleable area) then adds your proportionate share of common areas: lobbies, staircases, the clubhouse, sometimes even the guard room.

Nothing in the third addition is inside your home. That does not make it illegitimate — the corridor and the lift core genuinely cost money to build — but it does mean the super-area rate understates the true cost of the space you occupy.

What RERA changed

The Real Estate (Regulation and Development) Act, 2016 requires developers to disclose the carpet area of every unit, using a single statutory definition, in the agreement for sale. A registered project cannot sell you an area figure that has no defined basis. What RERA did not do is ban super-area pricing: builders may still quote a rate on saleable area, provided the carpet area sits in the agreement alongside it. So the disclosure exists; you just have to read it.

The loading factor, worked out

The gap between carpet and super area is the loading. If a 2 BHK has a carpet area of 750 sq.ft and is sold as 1,125 sq.ft of super area, the loading is 50%. At a quoted ₹8,000 per sq.ft of super area, your effective carpet rate is ₹12,000 per sq.ft — that is the number to compare across projects. In NCR, loading typically runs 25–35% in low-rise floors, 35–45% in group housing, and can cross 50% in amenity-heavy towers with large club footprints.

High loading is not automatically bad. A project with a 45% load and a genuinely large clubhouse, wide corridors and multiple lifts per core may serve you better than a 30% load with a cramped lobby. The point is to price the difference knowingly.

One trap to avoid: two builders can quote different carpet areas for the same physical flat. The RERA definition includes internal partition walls; some older brochures used a "net usable" figure that excluded them, which flattered the loading ratio. When a listing and an agreement disagree, the agreement figure — which must follow the statutory definition — is the one with legal force, and it is the one we display when the developer has disclosed it.

What else sits outside every area figure

None of the three areas includes the items that move your final cheque: car parking (sold separately, typically ₹2–6 lakh per slot in NCR), preferential location charges for a park-facing or corner unit, club membership, power backup per KVA, and the interest-free maintenance security collected at possession. A flat quoted at ₹1.2 crore on super area routinely closes at ₹1.32–1.38 crore all-in. Ask for the full cost sheet — not the rate card — before you compare anything, and check whether GST applies (it does on under-construction sales, not on ready units with a completion certificate).

How to compare two projects fairly

First, get the carpet area of the exact unit from the RERA disclosure or the draft agreement — not from the brochure. Second, divide the all-in price (including PLC, parking and mandatory charges) by that carpet area. Third, compare effective carpet rates and ask what the extra loading buys you in each case. On Crestwoods listings we show the carpet, built-up and super areas of every configuration where the developer has disclosed them, so this arithmetic takes seconds rather than a site visit.

The one-line summary: the carpet area is what you live in, the super area is what you pay on, and the loading factor is the bridge — insist on knowing all three before you compare prices anywhere.