11 August 2026
Carpet Area vs Built-Up vs Super Built-Up, Explained Properly
By Resset
Two flats. Both advertised as 1,200 sq ft. One has noticeably more usable space than the other. Neither developer is lying.
This is the single most useful thing to understand before you compare any two projects, and it takes about four minutes.
The three numbers
Carpet area is the space you can actually lay a carpet on. The floor area inside your walls - bedrooms, living room, kitchen, bathrooms, internal passages. It excludes the thickness of the external walls, and it excludes anything outside your front door.
This is the only number that describes the home you will live in.
Built-up area is carpet area plus the walls themselves, plus your balcony and any utility area. Typically around 10-15% more than carpet.
Super built-up area is built-up area plus your proportionate share of everything common - lobby, staircase, lift shaft, corridors, clubhouse, sometimes the security cabin and the generator room. Typically 25-40% more than carpet.
That last range is the whole problem. The percentage added is not standardised. One developer adds 25%, another adds 40%, and both call the result "super built-up".
A worked example
Two projects, both quoting 1,200 sq ft super built-up at ₹5,000 per sq ft. Both cost ₹60 lakh.
Project A loads 25%. Your carpet area is about 960 sq ft. Effective cost per usable sq ft: ₹6,250.
Project B loads 40%. Your carpet area is about 857 sq ft. Effective cost per usable sq ft: ₹7,000.
Same headline price. Project B gives you 103 sq ft less home - roughly a small bedroom - for the same money.
You cannot see this from the brochure. You can only see it by asking.
What RERA changed
This is where the law is genuinely on your side.
Under the Real Estate (Regulation and Development) Act, developers must disclose and sell on carpet area. The Act defines carpet area specifically, and it is what has to appear in your agreement.
Super built-up can still be used in marketing, and it usually is. But the number that governs your contract is carpet area, and you are entitled to it in writing.
So the question to ask at every site visit is simply:
"What is the RERA carpet area of this unit, in square feet?"
A straight answer is a good sign. Hesitation, or a redirect to super built-up, tells you something too.
How to compare two projects honestly
Get the RERA carpet area for the specific unit you are considering - not the typical unit, not the floor plan average.
Divide the all-in price by that carpet area. All-in means including floor rise, parking, club charges and any infrastructure or development charges.
Compare that number across projects.
It is the only apples-to-apples comparison available to you, and almost nobody does it.
Two things worth knowing
A high loading is not automatically bad. A project with wide corridors, a real clubhouse, generous lobbies and proper amenity space will have a higher loading than a bare-bones building - because those spaces genuinely exist and you genuinely use them. What matters is that you know what you are paying for and think it is worth it. A 40% loading with a proper amenity deck is a fair trade. A 40% loading with nothing to show for it is not.
Balconies vary in how they are counted. Ask specifically whether the balcony is inside or outside the quoted carpet area, and whether it is fully open or partly covered. On a compact home, a well-proportioned balcony changes how the whole flat feels - it is worth understanding exactly what you are getting.
The four questions to carry with you
What is the RERA carpet area of this specific unit?
What is the loading percentage between carpet and super built-up?
Is the balcony included in that carpet figure?
What is the all-in price, including every charge, before stamp duty?
Ask these at every site visit. Write the answers down. By the third project, you will know precisely who is being straight with you.
You are welcome to ask us all four. Our teams at Good Earth, The Park, Proxima and Evara will give you the carpet figure and the loading without you having to push.
Talk it through with someone who builds here
Resset has been building in Ahmedabad since 2006 - five communities across South Bopal, Shela and Telav, with 2,600+ families already living in them. If you want a straight answer about any of this against your own budget and timeline, book a site visit or call +91 99988 81927. No pressure, no scripts.