What Is Carpet Area?
Carpet area is the net usable area within the walls of your apartment — the area on which you can actually lay a carpet. It includes all rooms (bedrooms, living room, kitchen, bathrooms, toilets, and store rooms) and the area of internal partition walls. It does NOT include the thickness of external walls, balconies, verandas, terraces, or any common areas such as corridors, lobbies, staircases, and lift shafts.
Under the Real Estate (Regulation and Development) Act, 2016, the definition of carpet area is codified in Section 2(k). RERA makes it mandatory for all builders to disclose and sell on the basis of carpet area. If a builder quotes prices based on super built-up area, they are required to also clearly state the equivalent carpet area and the price per square foot of carpet area.
A typical carpet area is approximately 70% to 75% of the super built-up area for a well-designed apartment building. This ratio can be as low as 60% in buildings with oversized lobbies, wide corridors, or large amenity blocks.
What Is Built-up Area?
Built-up area is the carpet area plus the thickness of external walls and the area of balconies and verandas attached to your flat. It represents the total footprint of your individual unit, including its boundary walls. Balconies and terraces are typically counted at 100% of their area in Karnataka, though some older agreements counted them at 50%.
Built-up area is generally 10% to 15% more than carpet area. For example, if a 2BHK flat has a carpet area of 900 sq ft, its built-up area is likely to be between 990 and 1,035 sq ft. Before RERA came into force, many builders in Bangalore quoted prices on built-up area, which was a common source of buyer confusion.
What Is Super Built-up Area?
Super built-up area (also called saleable area) is the built-up area of your flat plus your proportionate share of all common areas in the building. Common areas include corridors, lobbies, staircases, lifts and lift machine rooms, security cabin, electrical rooms, the gym, swimming pool areas, club house, and any other shared amenity space. The builder calculates a loading factor — often 20% to 45% on top of built-up area — and adds it to arrive at the super built-up area.
This is where home buyers have historically been most vulnerable. A builder might advertise a 3BHK at ₹75 lakh based on a super built-up area of 1,500 sq ft at ₹5,000 per sq ft. However, the actual carpet area could be just 1,000 sq ft, meaning the effective cost is ₹7,500 per sq ft of usable space — 50% more than what the advertisement implies.
RERA Karnataka prohibits builders from quoting prices solely on super built-up area in registered projects. All RERA-registered project advertisements and agreements must prominently mention the carpet area and the price per sq ft of carpet area.
How RERA 2016 Protects Buyers on Area Definitions
The Real Estate (Regulation and Development) Act, 2016 brought landmark changes to how area is measured and disclosed in residential transactions. Section 12 of RERA makes it an offence for a promoter to make any false or misleading representation regarding the area of a real estate project. Section 18 entitles buyers to a refund with interest if the builder fails to deliver the carpet area stated in the agreement.
The agreement for sale must specify the exact carpet area of the apartment, the exact carpet area of the exclusive balcony/veranda, and the price payable for each. If the actual carpet area delivered differs from what was agreed, the buyer can claim a proportionate price adjustment. RERA Karnataka enforces this actively — buyers have received refunds and compensation orders where builders delivered fewer square feet of carpet area than promised.
When reviewing any sale agreement, look for a clause specifying carpet area as defined under RERA. If the agreement uses super built-up area as the basis for the total price, ask the builder to insert an addendum confirming the carpet area and its price per sq ft. A reputable builder will have no objection to this.
Practical Tips for Karnataka Home Buyers
Always ask the builder for the carpet area certificate or the RERA-registered floor plan showing carpet area. Cross-check the carpet area on the RERA Karnataka portal (rera.karnataka.gov.in) under the project's registered documents — all RERA-registered projects must upload floor plans with carpet area clearly marked. If the project is not registered with RERA and is above the threshold (more than 8 apartments or more than 500 sq mt of land), treat this as a serious red flag.
When comparing two projects, always compare on carpet area. A project offering 1,100 sq ft super built-up at ₹6,000 per sq ft (total ₹66 lakh) may have only 770 sq ft carpet area, while another project offering 850 sq ft carpet area at ₹7,500 per sq ft (total ₹63.75 lakh) is actually giving you more usable space at a lower effective per-sq-ft rate. The habit of mentally converting every quote to "price per sq ft of carpet area" protects you from misleading comparisons.
✅ Key Takeaways
🔗 Official Portal: rera.karnataka.gov.in
📅 Published: September 1, 2026 | This blog is a public awareness initiative. Verify all information with official sources before making financial decisions.
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