Carpet Area vs Built-Up vs Super Area Under RERA: A Buyer’s Guide

Updated October 18, 2026

Two flats can both be advertised as “1,650 sq ft” and offer very different amounts of usable space. The gap comes from how the area is measured. This guide explains the three common terms, how RERA treats them, and how to compare prices without being misled.

The three area terms in plain English

Carpet area

This is the only one of the three that the RERA Act defines. Section 2(k) calls it the net usable floor area of an apartment. It excludes external walls, service shafts, exclusive balcony or verandah area and exclusive open terrace area, but includes the area covered by internal partition walls.

In short, it is the floor space inside your front door, including the thickness of your internal walls. Balconies and terraces are not part of it, even when they are exclusively yours.

Built-up area

The Act does not define built-up area. In everyday use it means carpet area plus wall thickness and balconies or utility spaces. It does not include a share of lobbies, stairs or corridors. Contracts word it differently. Some builders count only half of a shared wall, for example. Check how your agreement defines it before relying on any number.

Super area (super built-up area)

This is built-up area plus your proportionate share of common spaces. Those spaces can include lobbies, staircases, lift wells, a clubhouse and gardens. It is also called saleable area. It is always the largest of the three numbers, which is why it was popular in brochures.

What regulators in NCR have said about super area

Haryana and Uttar Pradesh have both spoken on this. HRERA said on 27 April 2021 that apartments can be sold only on carpet area. Its notification says an agreement for sale on any other basis amounts to an unfair or fraudulent practice.

On 3 January 2024, UP RERA directed developers in the state to sell units on carpet area only. It said there is no justification for “super area”. It also noted that the RERA Act has no definition of super area.

In practice, super area has not vanished from advertising. One explainer notes it may still appear in marketing material but is not the legally binding figure. So treat any super-area number as a marketing figure, and ask for the carpet area in writing. I did not check Delhi’s own RERA directions for this article, so verify them if you are buying inside Delhi.

Typical loading: what is known and what is not

Loading is the extra area added to carpet area to reach the super area. There is no official “standard” figure. The numbers below come from broker and advisory sites, not from any regulator, so treat them as rough guides.

Be careful with the formula, because sources use two. One common version divides the gap by carpet area, so 1,300 sq ft super against 1,000 sq ft carpet is 30% loading. Dividing the gap by super area gives a smaller percentage for the same flat. Always ask which method is being used.

One Gurugram explainer lists loading of 30–40% on Dwarka Expressway, 25–35% in New Gurgaon and 35–45% on Golf Course Extension. That is one site’s estimate. It is not an official benchmark, and individual projects vary widely. I could not find reliable figures for Noida, Greater Noida or Ghaziabad. Ask the developer for each project’s actual numbers.

Another point on conversions. Rules of thumb for converting built-up to carpet vary between sources, so do not use them for a purchase decision. Use the carpet area given in the project’s RERA registration and your agreement.

How to compare price per sq ft fairly

Get the RERA carpet area for the exact unit. Do not accept “approx” figures from a sales call. Check it against the state RERA portal listing for the project.
Divide the total price by carpet area. Use the full agreement value, not the headline rate.
Make the totals comparable. Confirm whether parking, club membership, preferential location charges, taxes and maintenance deposits are inside or outside the quoted price.
Treat balconies separately. They are outside carpet area, so check whether you are being charged for them and at what rate.
Compare like with like. Under-construction and ready flats, and different floors or views, are not directly comparable on rate alone.

Worked example

The figures below are invented to show the arithmetic. They are not real projects or market rates.

	Flat A	Flat B
All-in price	₹1,15,50,000	₹1,12,00,000
Super area	1,650 sq ft	1,500 sq ft
RERA carpet area	1,100 sq ft	1,200 sq ft
Price per sq ft of super area	₹7,000	about ₹7,467
Price per sq ft of carpet area	₹10,500	about ₹9,333
Loading (gap ÷ carpet)	50%	25%
Carpet as share of super	about 67%	80%

On super area, Flat A looks cheaper at ₹7,000 against about ₹7,467. On carpet area, Flat A costs ₹10,500 per sq ft against about ₹9,333 for Flat B. That is roughly 12.5% more for each usable foot.

For 1,200 sq ft of usable space at Flat A’s rate, you would pay ₹1.26 crore. Flat B delivers that space for ₹1.12 crore. The lower headline rate hid a higher loading.

What the builder-buyer agreement must state

Under Section 13, a promoter cannot take more than 10% of the cost as an advance or application fee without first entering into a written agreement for sale and registering it. That agreement must set out the project and apartment particulars, specifications, payment dates and manner, the possession date, and the interest each side pays on default.

Beyond that, check these points against your draft:

Carpet area, stated as the RERA definition. Standard RERA-style agreements make carpet area mandatory and tie it to the RERA definition.
Price linked to carpet area. The total price should be recalculated if the final carpet area changes.
An area-variation clause. In the model clause, the price is recalculated after the promoter confirms the final area. A reduction means a refund with interest. The timeline and any percentage cap depend on the state’s version of the agreement. One source notes the widely quoted 3% figure is not in the Act itself. It sits in the agreement for sale. I could not confirm the exact wording in the UP or Haryana model agreements, so read your own clause line by line.
No unilateral plan changes. Section 14 limits changes to sanctioned plans. Minor changes need the allottee’s consent and structural changes need two-thirds consent.
Defect liability. Under Section 14(3), defects reported within five years of possession must be fixed free of charge within 30 days.
Balcony, terrace and parking areas listed separately, with their own measurements and charges.

A short checklist before you sign

Ask for the unit’s carpet area, balcony area and floor plan in writing.
Match the figures in the brochure, the allotment letter and the draft agreement.
Compute price per carpet sq ft yourself.
Ask what is included in the price and what is charged on top.
Have a lawyer read the area-variation and possession clauses.
Measure the flat at handover and compare it with the agreed carpet area.

Where to go next

If you are shortlisting flats, you can search all properties on ADiHomes and apply the carpet-area comparison above to each shortlist. For area-specific context, see our guides to Dwarka Expressway, New Gurgaon and Greater Noida West.

This article is general information, not legal advice. Rules and state-level model agreements can change, so confirm current requirements with your state RERA and a property lawyer before paying a booking amount.

Sources

Updated 18 October 2026. This article is general information, not legal or financial advice; check current rules and project details before you decide.