When we go to purchase a flat and meet builders and real estate agents we come across some new terminology. This includes words such as carpet area, built-up area, super built-up area, etc. Every builder calculates the area of a property in a different way. So while buying a property there is a lot of disconnection between what we pay and what we actually get. If we see the complaints registered in Consumer court, the maximum number of complaints is against the builders. Almost all these complaints are in the matter of fraud regarding the area of the flat purchased.

However, the central government passed the latest real estate act RERA (Real Estate Regulation and Development Act) in the year 2016. It has now made it mandatory to sell flats on the basis of carpet area only. Because the area of a flat is the main concern where a lot of people get cheated upon. So in this article, we will help you distinguish between these three.

Carpet Area

The carpet area is also the net usable floor area. It is the space where one can spread a carpet. According to RERA, a carpet area is the net usable floor area of an apartment which includes spaces such as kitchen, toilet, bathroom, and internal partition walls. Now this brings clarity which was not there before the introduction of RERA. For better clarity, we are listing the inclusions and exclusions of the carpet area.


It covers the area included by partition walls of an apartment, all rooms of a flat, kitchens, toilets, bathrooms, cupboard spaces and staircases withing the property unit


Carpet area excludes area covered by the external walls, service shafts, balconies, utility area, open terrace area, lift, lift lobby, staircases, verandahs, flower bed and clubhouse.


While buying a property look at the carpet area and then make a decision. Because that is what will give you the exact idea of actual usable space.

Built-Up Area

The built-up area is the total area measured on the outer line of your flat, including carpet area, balconies, external walls, etc. It refers to the usable or carpet area of your flat plus the area occupied by the walls and columns of your flat plus a little more. In other words, the built-up area will normally also include a percentage of:

  • Balcony
  • Service shafts
  • Mezzanine floor
  • Detached habitable areas such as servant’s room, etc.
  • Columns and Walls

Now that you know that the built-up area of your flat includes these additional areas, you will be able to calculate the actual usable or carpet area of your flat.


The built-up area excludes open terrace area, lift and lift lobby, staircase, clubhouse, swimming pool, etc.


Roughy built-up area is approximately 10% to 15% more than the carpet area.

Super Built-Up Area

If you have already bought a house or a flat you must be aware of the super built-up area. To make it clear let us discuss the super built-up area through an example.

In the year 2015, Mr.X was searching for a flat, he came across a difficult situation. There was a huge difference between the area of a flat which was constructed 10 years ago and the area of a recently constructed flat.

Option 1: Flat that was constructed 10 years back had an area of 800 square feet. Its value was Rs 60 lakh. It’s per square feet rate came up to Rs 7500.

Option 2: A recently constructed flat that had an area of 1100 square feet. Its price was Rs 65 Lakh. It’s per square feet rate came up to Rs 5909.

Now one can say that option two is better than option one. Since the area is more and the rate per square feet is less. But when Mr.X went to see both the flats physically he found that area of flat in option 1 looks bigger than the one in option two. The reason was in option one 800 square was the built-up area. Whereas in option two, 1100 square feet was the super built-up area. When Mr. X asked the real estate agent he explained about a loading factor. The loading for the newly constructed flat was more. Loading is the difference between the super built-up area and the carpet area.

When a builder constructs a building, he constructs common areas like clubhouse, lift lobby, staircases, etc., which will be used by all the people in the building. So while deciding the price of a flat, he adds the area of these common amenities in individual flats. This area is called the super built-up area.

A Super built-up area is the total built-up area of your flat plus proportionate share of the common amenities in your building complex. It is also called the saleable area. Proportionate share here refers to the sum total of all common areas divided by the total number of flats in your building complex.


Common areas such as lobbies, staircases, lift shafts, clubhouses, air ducts, pipe ducts/shafts, and other covered common facilities.


Open areas such as playgrounds, gardens, parks, driveways and roof terrace. If you find that your builder has included any of these areas in the super built-up area, you should immediately bring it to his notice – and renegotiate your buying price.


The Super built-up area is approximately 20% to 40% more than the carpet area. After RERA it has become mandatory to all the builders and developers to sell the flats on the basis of carpet area and not on the basis of super built-up area.

Before the year 2016, builders use to sell flats on the basis of super built-up area. Because of this builders were getting more money and the Government was also getting higher taxes in the form of stamp duty charges. But the pain of the buyer was not limited only to this. He also had to pay the maintenance charges for a lifetime on the basis of this built-up area. Earlier there was no definition of the carpet area on which a builder calculates the price of a property. Every builder or developer had his own method of calculation of the carpet area.

Before RERA the builders used to inflate carpet area. As a result of which the cost of the property will also shoot up. However, now RERA has clearly defined the method of calculation of the carpet area. Therefore the developers cannot manipulate any calculations in order to increase the price. This is all the information needed to know about the carpet area, built-up area, and super built-up area. Hope this article is useful to you.