When you compare flats in Bangalore, one might quote ₹6,000 per sq ft and another ₹8,000 per sq ft — but if the first price is on super built-up area and the second on carpet area, the cheaper-looking flat may actually cost more. RERA changed how developers must measure and price flats, but many advertisements still show inflated areas and lower per-sq-ft rates to make deals look better than they are. Understanding the three area types and what the law actually requires helps you compare prices honestly and avoid paying for space you will never use.
The Three Area Measurements Explained
Carpet area is the actual usable floor space inside your flat, measured wall-to-wall where you can lay a carpet. It includes bedrooms, living room, kitchen and bathrooms, but excludes the thickness of inner walls. This is the space you actually live in. Built-up area adds the area occupied by internal walls and, in some cases, a proportionate share of the balcony to the carpet area — it is typically 10-15% larger than carpet area. Super built-up area adds your share of common areas like lobbies, staircases, lifts, clubhouse, and the building’s external walls to the built-up area. Super built-up area can be 20-30% more than carpet area, sometimes even 40% in projects with large common facilities.
For example, a flat advertised as 1,200 sq ft super built-up might have only 900 sq ft of carpet area — the area you actually use. If the developer quotes ₹6,500 per sq ft on super built-up area, the real price per sq ft of usable space is ₹8,667. The ratio of super built-up to carpet area is called the loading factor. A loading of 1.33 means you are paying for 33% more area than you can use.
What RERA Requires Developers to Disclose
Under the Real Estate (Regulation and Development) Act 2016, every developer in Karnataka must define the flat price based on carpet area, not super built-up area. The agreement for sale must state the carpet area clearly, and the developer must hand over at least that much usable space. The developer is allowed to charge for other components — parking, club membership, external development — but those charges must be listed separately and cannot be hidden inside an inflated area figure. RERA also requires the developer to explain the loading factor in the sale agreement, so the buyer knows exactly how much common area they are paying for.
In practice, many developers still advertise on super built-up area because the per-sq-ft rate looks lower and the flat size looks bigger. The sale agreement will comply with RERA by stating carpet area, but the brochure and website may not. This is why comparing two projects by their advertised per-sq-ft rates is often misleading. Always ask for the carpet area and calculate the price per sq ft of carpet area before comparing.
What This Means for Buyers in Bangalore
When you evaluate a flat, ask the sales team for the carpet area in writing and divide the total flat cost (including everything except GST and registration) by that carpet area. That is your real per-sq-ft cost. Compare that figure across projects, not the headline per-sq-ft rate on super built-up area. Also ask what the loading factor is — if it is above 1.30, you are paying for a lot of common area, which may or may not add value depending on the amenities provided. A project with a gym, pool, and large landscaped areas will have higher loading than a simple building, and that is acceptable if you value those facilities. But if the loading is high and the amenities are ordinary, you are overpaying.
Before you sign, check that the sale agreement defines carpet area as per RERA (usable floor area, excluding walls) and states the exact carpet area in square feet or square metres. If there is any ambiguity, ask the developer to clarify in writing. The agreement should also state separately any charges for parking, preferential location, club membership, and external development charges, so you know what you are paying for. If the developer refuses to break down the pricing or will not confirm carpet area in writing, that is a warning sign.
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Frequently Asked Questions
Is price charged on carpet area under RERA?
Yes, RERA requires the sale agreement to define the flat price on the basis of carpet area and to state that carpet area clearly in the agreement. Developers may still advertise on super built-up area, but the legally binding agreement must price and measure the flat by carpet area, which is the actual usable floor space inside the flat.
What is the loading factor in a Bangalore flat?
The loading factor is the ratio of super built-up area to carpet area — it tells you how much common area you are paying for on top of your usable space. A loading of 1.25 means the super built-up area is 25% more than carpet area; 1.33 means 33% more. Higher loading is acceptable if the project has substantial common amenities, but if loading exceeds 1.30 without significant facilities, you may be overpaying.
How do I compare price per sq ft of carpet area across projects?
Ask each developer for the carpet area in writing, then divide the total flat cost (including all charges except GST and registration) by that carpet area to get the true price per sq ft. Do not rely on the advertised per-sq-ft rate on super built-up area, because developers use different loading factors and that makes headline rates incomparable.
Can a developer in Bangalore still sell on super built-up area?
Developers can advertise on super built-up area, and many still do, but the sale agreement registered under RERA must define and price the flat on carpet area. The agreement must also disclose the super built-up area and explain the loading, so the buyer knows exactly what they are paying for beyond the usable space.
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