Carpet area vs super built-up area: how to compare two flats
Last updated 2 November 2026
Carpet area is the usable floor area of a flat, and super built-up area adds walls and a share of the building’s common spaces. Two flats quoted at the same super area can differ a lot in usable space. To compare them fairly, divide the total price by the carpet area and work out the loading.
What counts as carpet area under RERA?
Carpet area is the net usable floor area of the apartment, including internal partition walls. Section 2(k) of the RERA Act excludes the external walls, areas under service shafts, and any exclusive balcony, verandah or open terrace. So a balcony is real space you get, but it does not count in the carpet figure. It should be stated separately.
UP RERA has told promoters to sell units on carpet area and has said that selling on super area breaks the Act. In practice you may still hear a super area figure in conversation, so it helps to know how the two connect.
How do the three areas compare?
Each figure adds another layer on top of the space you actually use.
| Measure | What it includes | Useful for |
|---|---|---|
| Carpet area | Usable floor inside the unit, with internal partitions | Comparing flats and checking furniture fit |
| Built-up area | Carpet area plus the unit’s walls | Understanding the unit’s footprint |
| Super built-up area | Built-up area plus a share of lobbies, lifts, stairs and similar spaces | Older price quotes, and maintenance billing where used |
How do you calculate loading?
Loading is the extra area added on top of carpet area, shown as a percentage. The formula is super built-up area minus carpet area, divided by carpet area, multiplied by 100.
Hypothetical example. These are made-up round numbers, not a real project. Flat A has a super area of 1,500 sq ft and a carpet area of 1,050 sq ft. Flat B has a super area of 1,400 sq ft and the same 1,050 sq ft of carpet area. Both are priced at ₹60 Lakh.
| Hypothetical | Flat A | Flat B |
|---|---|---|
| Price | ₹60 Lakh | ₹60 Lakh |
| Rate on super area | ₹4,000 per sq ft | About ₹4,286 per sq ft |
| Loading | About 43% | About 33% |
| Rate on carpet area | About ₹5,714 per sq ft | About ₹5,714 per sq ft |
Flat A looks cheaper on the quoted rate. On usable space, they cost the same. That is why a lower super area rate proves nothing on its own.
Is low loading always better?
No. Low loading means less of your price goes to shared space, but shared space is also what you are paying to use. A wide lobby, more lifts or a larger clubhouse raises the loading and may be worth it to you. Compare what the extra loading buys. The number only starts the conversation.
What should you ask for in writing?
Three figures settle most arguments, and all of them belong in your documents.
- The carpet area of your unit, as stated in the agreement for sale.
- The balcony, verandah or terrace area, listed separately.
- The total price, so you can divide it by carpet area yourself.
Add the charges too, because the fair comparison uses the full cost. Our guide to reading a cost sheet shows which lines to include.
The carpet figure matters most on family homes, where a few square feet decide whether a room works. If you are shortlisting, run this sum across 3 BHK flats in Lucknow and compare with larger 4 BHK homes. If budget comes first, start from our page on flats under ₹1 Cr, and ask for the carpet area of every option before you visit.
Frequently asked questions
Is a balcony included in RERA carpet area?
No. The RERA Act excludes exclusive balconies, verandahs and open terraces from carpet area. They are still part of what you get, so ask for their area to be stated separately in the agreement.
Can the final carpet area differ from what was promised?
Measurements can change between plan and construction, so read the agreement's clause on area changes before signing. Check how any difference is priced, and whether a refund is due if the area falls.
Why do resale listings still quote super area?
Many older flats were sold on super area, so the old paperwork and the market habit stay with them. Ask for the carpet area, and if the papers do not show it, measure the flat yourself.