Carpet Area vs Super Area: Why Two 3 BHKs Differ by 600 sq.ft.

The most expensive mistake in Indian property buying is comparing configuration labels. Two apartments both advertised as 3 BHK, both quoted at similar prices per square foot, can differ by six hundred square feet of space you can actually stand in.

The reason is the gap between carpet area and super area, and the fact that only one of them is defined by law.

The three definitions

• Carpet area is the net usable floor area within the walls of the apartment, excluding the external walls, shaft, exclusive balcony and open terrace, but including internal partition walls. RERA defines it precisely and requires all sales to be made on it.
• Built-up area adds the thickness of the walls and the balcony. It typically runs 10-20% above carpet.
• Super area or saleable area adds a proportionate share of common areas - lobbies, staircases, lifts, clubhouse, corridors. It is not defined by any statute, and the loading factor is set by the developer.

The number to compute

Divide carpet area by super area. That is your carpet ratio, and it tells you what proportion of what you are paying for you can actually occupy.

In Delhi NCR, 66-68% is typical. Below 65% deserves an explanation. Above 72% is genuinely good and usually indicates a developer who designed for efficiency rather than for maximum saleable area.

A 6-percentage-point difference in ratio on a 2,500 sq.ft. super area purchase is 150 sq.ft. of real space - roughly a bedroom.

Worked comparison from live projects

Here are carpet and super areas from projects currently on our desk, with the ratio computed.

Why loading factors vary

A project with a very large clubhouse, wide lobbies and generous corridors genuinely has more common area to distribute, so a lower carpet ratio is not automatically a bad thing - you are paying for amenity you will use.

What is a bad thing is a low ratio without the amenity to justify it. If a project shows a 63% carpet ratio and a 26,000 sq.ft. clubhouse for 700 units, the loading is not going into anything you benefit from.

Ask for both numbers. Carpet ratio without clubhouse size is only half the picture.

What RERA changed and what it did not

Since 2016, developers must quote and sell on carpet area, and the agreement must state it. That eliminated the worst abuses.

What RERA did not do is standardise super area or ban its use in marketing. Brochures, hoardings and price lists across NCR still lead with super area because the per-square-foot number looks lower. The agreement will carry carpet; the advertisement will carry super.

When you compare, convert everything to price per carpet square foot. It is the only basis on which two projects are genuinely comparable.

A two-minute discipline

• Ask for carpet area in square feet for the exact unit, not the configuration type.
• Ask for super area for the same unit and compute the ratio.
• Divide the total price by carpet area to get your real rate per square foot.
• Compare that number across your shortlist rather than the advertised rate.
• Check the floor plan room dimensions - a 1,800 sq.ft. carpet apartment with four small bedrooms lives smaller than one with three large ones.

Doing this on a shortlist of five projects takes ten minutes and routinely reorders the list.

The projects behind the figures in this article

Each of these is on our desk today, with a live RERA registration and a price dated within the last month.

M3M Mansion Penthouse Suites sits in Golf Course Extension Road from M3M India, quoted at price on request with possession in December 2029. On 6.8 acres it carries 168 units at 83% open area. Its strongest card is that private plunge pool structurally designed into each terrace slab; its weakest is that price on request, and terrace areas charged separately from the headline rate.

Sobha International City Villas (Sobha, Dwarka Expressway) is quoted at ₹6.4 Cr to ₹11.5 Cr for a Ready to move handover, across 372 units on 46 acres with 68% left open. Worth knowing: Developer-built villas with consistent construction across the whole township. Less good: open area of 68% is lower than the apartment projects because plots consume land.

Tata Primanti Villas - Tata Housing, Golf Course Extension Road. ₹5.9 Cr to ₹9.8 Cr, possession Completed and occupied. 38 acres, 268 units, 70% open. Fully occupied, so residents can be interviewed before purchase. The trade-off: amenities shared with the tower and floor components of the township.

Emaar Emerald Hills Plots sits in Golf Course Extension Road from Emaar India, quoted at ₹3.1 Cr to ₹7.2 Cr with possession in Ready to move. On 62 acres it carries 640 units at 62% open area. Its strongest card is that full internal infrastructure delivered and handed over; its weakest is that you must fund and manage construction yourself, adding 18-30 months.

Signature Global SCO Plaza 84 (Signature Global, Sector 84) is quoted at ₹2.85 Cr to ₹6.5 Cr for a December 2027 handover, across 84 units on 4.2 acres with 55% left open. Worth knowing: Freehold SCO under the Haryana 2019 policy with no shared structural maintenance. Less good: commercial yields depend on catchment occupancy, which is still building.

Signature Global Daxin Vistas - Signature Global, Sector 84. ₹1.15 Cr to ₹1.95 Cr, possession September 2030. 8.9 acres, 712 units, 72% open. Entry at Rs 1.15 crore with Dwarka Expressway access in under ten minutes. The trade-off: possession in September 2030 is a long lock-in for a mid-segment buyer.

M3M Antalya Hills Floors sits in Sector 79 from M3M India, quoted at ₹1.65 Cr to ₹2.45 Cr with possession in June 2027. On 22 acres it carries 560 units at 66% open area. Its strongest card is that whole floor plate with only three neighbours per building; its weakest is that only 66% open area, the lowest among the residential projects listed here.

Max Estates 360 (Max Estates, Sector 44) is quoted at ₹3.2 Cr to ₹6.4 Cr for a March 2029 handover, across 620 units on 15.8 acres with 80% left open. Worth knowing: WELL Building Standard with mechanical fresh-air filtration in every apartment. Less good: 8-15% price premium over specification-matched competitors without the air systems.

Godrej Riverine - Godrej Properties, Noida Expressway. ₹2.3 Cr to ₹4.4 Cr, possession June 2029. 13.4 acres, 680 units, 78% open. Carpet-to-super ratio near 72% with efficient, corridor-free layouts. The trade-off: legacy stalled projects on the same corridor still affect buyer perception.