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All You Need to Know about Carpet Area, Built up Area and Super Built up

August 7, 2023


How often were you puzzled when a developer quoted terms like RERA carpet area and built-up area calculation, among others? Getting to know these terms may seem like a pain just when you have crossed the milestones of selecting the right location, builder and budget. In reality, having proper knowledge of the jargon significantly impacts the success of your investment in an apartment.

We offer you a comprehensive guide to understanding the difference between carpet area vs built-up area vs super built-up area. A proper understanding is conducive to a more informed house-buying process.

What is a Carpet Area?

To put it in simple terms, the carpet area of an apartment denotes the space that a carpet can cover. The carpet area encompasses the spaces covered by the dining hall, kitchen, living room and balcony inside the apartment and toilets.

Understanding the carpet area is vital for homebuyers to precisely measure the apartment unit and know which portion of the property is included. Additionally, with a clear definition of the carpet space, buyers can now ascertain the accurate measurement of the usable area.

How to Calculate the Carpet Area?

Buyers must take heed that the price of an apartment is based on the carpet area and not the super built-up area. It warrants a proper calculation of the site. Builders use the below formula:

Carpet area = area of bedroom + living room + balconies + toilets - the thickness of the inner walls.

What is the RERA Carpet Area?

The Real Estate Regulatory Authority (RERA) Act specifies that carpet area is a house's net usable floor space and the distance between the inner partition walls. It excludes the space covered by the external walls, under service shafts, private balconies and exclusive terrace area.

Prior to the implementation of the RERA Act, most builders used to mention only the built-up or super-built area instead of the carpet area while pitching for a property. 

Buyers must note that they are eligible to get a refund if the promised carpet area differs from the actual value after the completion of the construction project. In case of an increase in the space, they will be charged accordingly. However, as per RERA's limitations, the increase in the carpet area cannot exceed 3%.

How to Calculate the RERA Carpet Area?

The RERA carpet area calculator is an easy process of measuring the carpet area, which is 70% of the total built-up area.

What is a Built-up Area?

The built-up or plinth area comprises the carpet space and additional individual spaces enclosed by the apartment's walls. These extra spaces consist of balconies, terraces, mezzanine floors and the utility area. Typically, the built-up area is approximately 10-15% larger than the carpet area.

As a buyer, you must know that 50% of partition walls shared by other flat units are considered. In contrast, the entirety of other divisions is calculated while determining the build-up area.

The built-up area value is the main component determining the actual area used.

How to Calculate the Built-Up Area?

Use the formula below to arrive at your built-up area value:

Built-up area = Carpet area + area of walls + area of the balcony

Let's assume that dry balconies and terraces collectively cover 10% of the total built-up area while the actual usable space constitutes only 70%. If the built-up area measures 1,000 sq ft, it implies that 30%, equivalent to 300 sq ft, is non-usable, leaving behind 700 sq ft as the functional space that can be utilised.

What is a Super Built Up Area?

Also termed the saleable area, the super built-up area is the sum of the total built-up area and a specific portion of common spaces termed the loading factor, such as the lobby, lift, corridors, etc. The value of the part generally ranges between 25% to 60% of the carpet area.

The value increases with the portion of the amenities, such as a swimming pool, clubhouse and garden, among others provided within the apartment complex. 

However, the super built-up area does not encompass spaces like open-air swimming pools, compound walls, driveways, parks, play areas, outdoor sports facilities, inaccessible garden spots, water tanks, septic tanks and underground sinks.

As a homebuyer, you must know that a super built-up area does not hint at a more expansive usable space inside the apartment. It is vital to ensure that the loading factor for a luxury apartment is below 60%. A value higher than that means you have a larger super built-up area but a smaller carpet area, resulting in settling for homes with smaller spaces.

How to Calculate a Super Built-Up Area?

Here is the formula to determine the super built-up area:

Super built-up area = Built-up area + common areas (stairs, lobbies, lift, pool, etc.)

The loading factor can be calculated using the following formula:

Super built-up area = Carpet area * (1 – loading factor)

For instance, when the loading factor is 1.6 times, it indicates that the developer has increased the carpet area by 60%. In this specific scenario, the built area measures 1000 sq ft, and the super built-up area is 1600 sq ft. The loading factor itself amounts to 600 sq ft.

Common Mistakes During Carpet Area, Super Built-Up and Built-Up Area Calculations

Considering the most specific areas within the carpet, super built-up and built-up areas are often significant pain points for homebuyers. Some builders may mention only the built-up area, leading buyers to believe they are getting more space than they actually are. Always ask for the carpet area specifically or look for projects that disclose both carpet and built-up areas.

The super built-up area includes common spaces like lobbies, staircases and corridors, which are proportionately divided among all the apartment units. Often, buyers forget to factor in these areas while comparing properties, leading to discrepancies in perceived value. Buyers must consider the efficiency of the common areas and their impact on the usable space.

Builders may follow different calculation methods to determine built-up and super built-up areas. Some use the outer dimensions of the walls, while others consider centerline measurements. The lack of standardisation creates confusion. Buyers must enquire about the method used for calculation and, if possible, consult a professional to verify the accuracy.

The price of amenities and common facilities is divided among all the units for super built-up areas. This can lead to discrepancies in the property ownership cost compared to the actual space you get. While considering a property, assess the amenities' value to ensure you are comfortable with the cost distribution.

Wall thickness can vary depending on the construction style and materials used. Overlooking this aspect can lead to inaccuracies in the built-up area calculation. While it may not make a significant difference for individual properties, it can impact comparisons between properties with varying wall thicknesses.

Difference between Carpet Area and Built-up Area and Super Built-up Area

The carpet area vs built-up area vs super built-up area difference is best understood by knowing the kind of spaces considered while determining each entity's value. 

Here is a look at it in a tabular format:

Space Built-up Area Super built-up Area Carpet Area
Living room Yes Yes Yes
Bedroom Yes Yes Yes
Kitchen Yes Yes Yes
Washroom Yes Yes Yes
Dining hall Yes Yes Yes
Kid’s room Yes Yes Yes
Study room Yes Yes Yes
Guest room Yes Yes Yes
Balcony Yes Yes No
Lobby No Yes No
Terrace Yes Yes No
Lift Yes Yes No
External staircase Yes Yes No
Internal staircase Yes Yes Yes
Pooja room Yes Yes Yes
Garden No Yes No
Verandah Yes Yes No


When considering a property, it is essential to know the difference between carpet area, built-up area and super built-up area. Always ask the developer or seller to clarify the area specifications to avoid confusion or potential disputes later. Get clarity on whether you value actual usable space over shared amenities and focus on the carpet area. Consider the super built-up area if you desire a well-equipped residential property with various facilities.

In conclusion, being aware of these terminologies empowers you to make informed decisions that align with your preferences and budget. Purchasing a property is a significant investment, and understanding the nuances of carpet, built-up, and super built-up areas ensures that you get the best value for your hard-earned money.


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