Carpet Area vs Super Built-Up: What RERA Actually Requires

What is carpet area under RERA?

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 the area covered by the external walls, areas under services shafts, exclusive balcony or verandah area and exclusive open terrace area, but including the area covered by the internal partition walls of the apartment.

That is a precise definition, and its precision is the point. Before it, every developer used its own basis, and comparing two projects meant comparing two different things.

The Act also requires a promoter applying for registration to disclose the number, type and carpet area of apartments for sale in the project (Section 4). The agreement for sale formats prescribed under State RERA rules generally state the price by reference to carpet area. So when a builder quotes only super built-up area, it is working against the structure the Act sets up.

What was super built-up area?

Super built-up area typically took the carpet area, added the thickness of walls, added the balcony, and then added a proportionate share of common areas such as lobbies, staircases, lifts and sometimes amenities like a clubhouse. The proportion added, often called the loading, varied between developers and was rarely disclosed.

The practical effect was that a flat sold as 1,200 square feet might have perhaps 800 square feet of usable space, and the buyer had no way to know without asking a question most did not know to ask. Two projects quoting the same rate per square foot could differ substantially in what you actually got.

The figure has not disappeared. Many listings, resale portals and sales conversations still use super built-up area because it produces a bigger number and a lower-looking rate. There is nothing wrong with knowing it, provided you never compare projects, or agree a price, on that basis alone.

What is the difference between carpet, built-up and super built-up area?

A worked example: the real price per square foot

Suppose two projects in Pune both quote ₹10,000 per sq ft.

Project A sells a flat as 1,200 sq ft super built-up. On asking, the carpet area is 840 sq ft. The total price is ₹1.2 crore, which works out to about ₹14,286 per sq ft of carpet area. The loading is 360 sq ft, or roughly 43 per cent of carpet area.

Project B sells a flat as 1,100 sq ft super built-up with a carpet area of 880 sq ft. The total price is ₹1.1 crore, or ₹12,500 per sq ft of carpet area.

Project B looks smaller on the brochure, costs ₹10 lakh less, and gives you 40 sq ft more usable space. That is the comparison the super built-up figure hides. Do the same arithmetic for every project on your shortlist, using the carpet area stated in the agreement or on the State RERA record, not the figure in the sales presentation.

What to check in your agreement

• Whether carpet area is stated as a specific figure, in the agreement rather than only in a brochure.
• Whether that figure matches the carpet area disclosed for the unit type on the State RERA project page.
• Whether the price is expressed by reference to carpet area or to some other basis.
• Whether balcony, terrace and parking are dealt with separately and priced separately, and whether the parking is identified.
• Whether the agreement states the common areas and your undivided share in them.
• Whether there is a variation clause permitting the area to change, and by how much, with what price adjustment.

Common areas, parking and what you actually own

Super built-up pricing blurred a second question: what you own outside the flat. Under RERA, common areas are defined separately in Section 2(n), and the agreement should describe your undivided proportionate share in them. Lobbies, staircases, lifts, open spaces and community facilities are meant to pass to the association of allottees, not to remain with the builder.

That matters for two reasons. First, if you are paying a loading charge for common areas through a super built-up rate, and separately paying for amenities or a clubhouse membership, you may be paying twice. Second, a list of common areas in the agreement is what lets the association later insist that a promised garden or gym is handed over rather than quietly converted.

Parking deserves its own line in the agreement: covered or open, the specific slot if allotted, and whether any charge is made. A vague promise of parking in the brochure is not the same as an identified slot in the agreement.

Questions to ask before you book

• What is the carpet area of this exact unit, as defined in Section 2(k) of RERA, and where is it stated on the State RERA record?
• What are the balcony and terrace areas, and are they charged separately?
• What is the total price divided by the carpet area?
• What does the price include: parking, clubhouse, power backup, maintenance deposit, and which taxes?
• What variation in carpet area does the agreement allow, and how is a shortfall refunded?
• Can I see the draft agreement for sale before paying the booking amount?

The variation clause

Most agreements permit some tolerance between the stated carpet area and the area on completion, because construction is not exact. A small permitted variation with a corresponding price adjustment in both directions is reasonable. The model agreement for sale annexed to many States' RERA rules generally lets the builder charge for an increase in carpet area of up to about three per cent, and requires a refund, with interest, if the area delivered is smaller. The details differ between States, so check the format your State prescribes.

What is worth examining is a wide tolerance, a tolerance that operates only in the builder's favour, or a clause permitting a reduction in area without a refund. Those are the versions where an ostensibly technical clause carries real money. On the Pune example, a five per cent reduction in an 840 sq ft flat is 42 sq ft, worth about ₹6 lakh at the carpet area rate.

Sample wording to propose: "If the carpet area delivered is less than the carpet area stated in this Agreement, the Promoter shall refund the price of the shortfall at the rate per square foot of carpet area under this Agreement, with interest at the prescribed rate, within 45 days. Any increase shall not exceed three per cent and shall be payable only on the Allottee's written consent."

How do you check carpet area at possession?

Ask for the as-built carpet area figure in writing before you take possession, along with the occupancy certificate. Then measure. A laser distance meter or a surveyor engaged for a few thousand rupees can measure room by room, adding the internal partition walls and excluding the balcony and any exclusive terrace.

Small differences are normal. A shortfall beyond the tolerance in your agreement is worth raising in writing before you sign the possession letter, because some possession letters include a declaration that you have accepted the area and are satisfied. Do not sign that declaration if your measurement shows a material shortfall; record the difference instead.

If the brochure and the agreement differ

Brochures, sample flats and sales conversations frequently describe a larger number than the agreement. Section 12 of RERA addresses the position where a person makes an advance or deposit on the basis of information contained in an advertisement or prospectus that proves to be incorrect, providing for compensation and, if the allottee withdraws, a refund with interest.

The practical advice is simpler than the legal question: keep the brochure, keep the price sheet, keep the emails and screenshots of online listings. Where what you were shown differs from what you signed, contemporaneous material is what makes the difference between an assertion and a case. Complaints go to the State RERA authority under the Act.

If you are buying with a home loan, share the agreement and the carpet area figure with your lender early. Banks value the flat independently, and a valuation report that records a smaller usable area than the agreement is an early warning worth investigating before you sign, not after the first disbursement.