Carpet Area Under RERA: What Bengaluru Buyers Actually Pay For, and How to Compare Flats
RERA Section 2(k) defines carpet area as the net usable floor area of a flat, including internal walls but excluding external walls, shafts, exclusive balconies and terraces. Section 4(2)(h) makes promoters disclose it at registration. Here is how a Bengaluru buyer uses it to compare flats.
Picture two Bengaluru flats advertised at the same headline size, 1,250 square feet, a few kilometres apart. Walk through both with a tape measure and one feels noticeably roomier. The difference usually sits in a word that the brochure prints in small type, or not at all: carpet. The Real Estate (Regulation and Development) Act, 2016 gave that word a precise legal meaning, and it is the single most useful number on a Bengaluru buyer's comparison sheet.
The short answer. Section 2(k) of the RERA Act defines carpet area as the net usable floor area of an apartment, excluding external walls, service shafts, the exclusive balcony or verandah and the exclusive open terrace, but including internal partition walls. Section 4(2)(h) requires the promoter's registration application to state the number, type and carpet area of apartments for sale, with balcony, verandah and terrace areas listed separately, and Section 11(1) puts those details on the Authority's website for public viewing. The trade-off: carpet area makes flats comparable, but it is a smaller number than any super built-up figure a seller may quote, so the price per square foot on a carpet basis will look higher.
What does carpet area mean under RERA?
The Gazette of India text of the RERA Act defines it in Section 2(k): "carpet area" means 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 includes the area covered by the internal partition walls of the apartment.
The Explanation to that clause defines the two exclusions buyers argue about most. "Exclusive balcony or verandah area" means the area of the balcony or verandah appurtenant to the net usable floor area of an apartment and meant for the exclusive use of the allottee. "Exclusive open terrace area" means the area of open terrace appurtenant to the net usable floor area and meant for the exclusive use of the allottee.
The Act applies across states, so the same definition governs a flat in Whitefield, Hebbal or Electronic City.
What is inside and outside the carpet area?
The definition is short, but it sorts every part of a flat into one of two buckets. The table lays out the five components the Act names.
| Part of the flat | In carpet area? | What Section 2(k) says | Where it is disclosed | What to check |
|---|---|---|---|---|
| Internal partition walls | Included | Includes the area covered by internal partition walls | Within the carpet area figure | Room layout matches the sanctioned plan |
| External walls | Excluded | Excludes the area covered by external walls | Not part of carpet area | Whether a seller's quoted area adds them back |
| Service shafts | Excluded | Excludes areas under services shafts | Not part of carpet area | Whether a seller's quoted area adds them back |
| Exclusive balcony or verandah | Excluded | Excludes exclusive balcony or verandah area | Listed separately under Section 4(2)(h) | Separate balcony figure in the agreement |
| Exclusive open terrace | Excluded | Excludes exclusive open terrace area | Listed separately under Section 4(2)(h) | Separate terrace figure in the agreement |
Two practical points follow. First, an internal wall you plan to knock down later is already counted in the carpet area, so removing it does not add to your carpet figure. Second, a large private balcony does not inflate the carpet area. It appears as a separate number, and you should see that number written down rather than folded into a bigger total.
Where does the builder have to disclose it?
At registration. Section 4(2) lists what a promoter must enclose with an application to register a project, and clause (h) requires the number, type and carpet area of apartments for sale in the project, along with the area of the exclusive balcony or verandah areas and the exclusive open terrace areas with the apartment, if any. Clause (i) separately requires the number and areas of garages for sale.
That information does not stay in a file. Section 11(1) says the promoter, on receiving login credentials, shall create a web page on the Authority's website and enter all details of the proposed project as provided under Section 4(2), in all the fields provided, for public viewing. Section 34(b) makes it a function of the Authority to publish and maintain a website of records for public viewing, including information provided in the application for which registration has been granted. We walked through how to read those records in our guide to checking a Bengaluru project's RERA records.
How do you compare prices on a carpet basis?
Convert every quote to the same unit before you compare. Here is an illustration with round, hypothetical numbers, not market data.
Flat A is quoted at Rs 90 lakh for 1,250 square feet of super built-up area, which is about Rs 7,200 per square foot on that basis. Its registration disclosure shows a carpet area of 850 square feet. On a carpet basis, the same Rs 90 lakh works out to about Rs 10,588 per square foot. Flat B is quoted at Rs 92 lakh for 1,200 square feet, about Rs 7,667 per square foot, with a carpet area of 900 square feet, or about Rs 10,222 per square foot of carpet.
On the headline figure, Flat A looks cheaper per square foot. On carpet area, Flat B gives you 50 more square feet of usable floor for Rs 2 lakh more, and costs less per usable square foot. The gap between 1,250 and 850 in Flat A is 400 square feet, which is about 47 percent of its carpet area. That ratio, sometimes called loading, is worth computing for every shortlist.
Note that the RERA definition only fixes what carpet area means. It does not, by itself, tell you how maintenance or other charges will be split. In Karnataka, how maintenance is shared under the 2026 apartment ownership law is a separate question, which we covered in our explainer on maintenance charges on super built-up area under the Karnataka Apartment Act, 2026.
What rights do you have to see the plans?
Carpet area on paper is only useful if you can test it against the drawings. Section 19(1) says the allottee shall be entitled to obtain information relating to sanctioned plans and layout plans along with the specifications approved by the competent authority, and other information under the Act, the rules and regulations, or the agreement for sale. Section 4(2)(d) separately requires the sanctioned plan, layout plan and specifications to be part of the registration application.
After handover, Section 19(5) entitles the allottee to have the necessary documents and plans, including those of common areas, once the promoter hands over physical possession. Keep the plan that shows your unit, and measure against it at possession.
Shortlisting in the east? Our page on Brigade Granada in Whitefield shows the kind of project detail worth cross-checking against the registration record.
What if the flat you get is smaller than promised?
Measure at possession, and compare against two documents: the carpet area in your agreement for sale and the sanctioned plan for your unit. If they do not match, the Act gives you several hooks to hang a complaint on.
Section 14(1) says the proposed project shall be developed and completed by the promoter in accordance with the sanctioned plans, layout plans and specifications as approved by the competent authorities. A unit that comes out smaller than the sanctioned plan raises a question under that provision. Section 18(3) adds that if the promoter fails to discharge any other obligation under the Act, the rules or regulations, or the terms and conditions of the agreement for sale, he shall be liable to pay compensation to the allottees in the manner provided under the Act.
If a smaller figure came from a brochure or a model flat, Section 12 may also apply, because it covers loss caused by an incorrect or false statement in an advertisement or prospectus, or on the basis of a model apartment. The exact remedy depends on the facts and on what the Authority or adjudicating officer decides. The point for a buyer is simpler: the number written in your agreement is the one you can enforce, so make sure it is the carpet area and not a looser measure.
What should you check before you sign?
Do this for every flat on your shortlist, not just the favourite.
- Ask the seller for the carpet area in writing, using the Section 2(k) definition, not just a saleable or super built-up figure.
- Find the same unit type on the project's RERA web page and match the carpet area to the figure you were given.
- Note the exclusive balcony, verandah and open terrace areas as separate numbers, as Section 4(2)(h) requires them to be disclosed.
- Recalculate the price per square foot on carpet area for every option, using the same method for each.
- Compute the ratio of the quoted area to carpet area, so you can see how much non-usable area is in the headline number.
- Get the sanctioned plan for your unit under Section 19(1) and check that the room layout matches what you were shown.
- Make sure the agreement for sale states the carpet area of your unit, so the figure you paid for is on record.
Frequently asked questions
What is carpet area under RERA?
Section 2(k) of the RERA Act, 2016 defines carpet area as the net usable floor area of an apartment, excluding the area covered by 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.
Is the balcony included in carpet area?
No. Section 2(k) excludes the exclusive balcony or verandah area, defined as the balcony or verandah appurtenant to the net usable floor area and meant for the allottee's exclusive use. Section 4(2)(h) requires the promoter to disclose those balcony or verandah areas separately alongside the carpet area of each apartment.
Where can I see a project's carpet area disclosures?
Section 4(2)(h) requires the registration application to state the number, type and carpet area of apartments for sale. Section 11(1) requires the promoter to enter all Section 4(2) details on its web page on the Authority's website for public viewing, and Section 34(b) requires the Authority to maintain that website of records.
How do I compare two flats fairly?
Convert both prices to rupees per square foot of carpet area. In our hypothetical example, Rs 90 lakh for 850 square feet of carpet is about Rs 10,588 per square foot, while Rs 92 lakh for 900 square feet is about Rs 10,222, so the second flat is cheaper per usable square foot.
Last updated 2026-11-14. PropNewz Team.
Contact Us
Stay updated with latest news and new projects!
Tell us what you want, We'll do the rest.
Share your budget and where you're looking. An advisor who has actually walked the sites will shortlist a handful of RERA-registered projects and tell you which to skip.