Carpet area vs built up area is the first thing to sort out before you compare two homes in Bangalore, because the same house can be sold as 2,844 sq ft or 4,064 sq ft depending on which number the brochure prints. Carpet area is the floor you can actually use. Built-up area adds the walls and some outdoor spaces. Super built-up area adds a share of the lobbies, lifts and clubhouse. This guide explains each one under the RERA Act, shows how they differ for flats and villas, and turns a quoted price per sq ft into the rate you’re really paying.
Key takeaways
- Carpet area is defined by law in Section 2(k) of the RERA Act, 2016. Built-up and super built-up area aren’t
- Carpet area excludes external walls, service shafts, exclusive balconies and exclusive open terraces, but includes internal partition walls
- In a typical Bangalore apartment, carpet area is roughly 70–80% of super built-up area. The gap is called loading
- In a villa, the gap between carpet area and built-up area can still be around 30%, because of walls, stairs and a lift shaft on every floor
- Carpet area vs built up area isn’t a technicality: convert every quoted rate to a price per sq ft of carpet area before comparing projects
Comparing a villa right now? Our page on NVT Oikos in Whitefield lists the official built-up and land areas for its 28 villas, which we use as the worked example below.
In this guide
A note on sources. The definition below is quoted from the RERA Act, 2016. NVT Oikos figures come from the developer’s project page and brochure, read on 21 October 2026, unless we say a portal reported them. Loading and rate conversions are our own arithmetic.
Carpet Area vs Built Up Area: The Short Answer
Carpet area vs built up area vs super built-up area: think of three boxes, one inside the other.
Carpet area is the smallest. It’s the floor inside your home’s walls that you can walk on, furnish and clean, including the space under internal partition walls.
Built-up area is the middle box. It adds the thickness of the external walls and, depending on the builder, balconies, utility areas and terraces that belong only to you.
Super built-up area is the biggest. It adds your proportionate share of common areas: corridors, staircases, lift lobbies, the clubhouse and sometimes the security cabin. Builders also call it saleable area.
So the difference between carpet area vs built up area is mostly walls and private outdoor space. The difference between carpet area and super built-up area is walls, private outdoor space and a slice of everything you share with your neighbours.
| Measure | What it includes | Defined by law? |
|---|---|---|
| Carpet area | Net usable floor inside the home, including internal partition walls | Yes, RERA Act Section 2(k) |
| Built-up area | Carpet area + external walls + (often) balconies, utility and exclusive terraces | No standard definition |
| Super built-up area | Built-up area + share of corridors, lifts, stairs, lobbies, clubhouse | No standard definition |
| Plot or land area (villas) | The land you own, measured on the ground | Recorded in the sale deed |
Only the first row has a fixed legal meaning. That’s the whole reason the carpet area vs built up area question matters.
What Carpet Area Means Under RERA
Before RERA, every Bangalore builder measured “carpet area” a little differently. Some included balconies. The Act fixed one definition for the whole country.
Section 2(k) of the Act says 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 an exclusive balcony or verandah as one “appurtenant to the net usable floor area of an apartment, meant for the exclusive use of the allottee”. An exclusive open terrace is defined the same way. You can read the background to the law on Wikipedia’s page on the RERA Act.
Carpet area vs built up area: what’s in and what’s out
| Counted in carpet area | Not counted in carpet area |
|---|---|
| Bedrooms, living and dining rooms | External walls |
| Kitchen and toilets | Service shafts (plumbing, electrical ducts) |
| Internal passages inside the home | Exclusive balconies and verandahs |
| Area under internal partition walls | Exclusive open terraces |
| Built-in wardrobe floor space | Common corridors, lifts, stairs, clubhouse |
One detail surprises people. Internal partition walls are counted, so the RERA carpet area is a little larger than the floor you could actually lay a carpet on. Before RERA, many buyers used “carpet area” to mean wall-to-wall floor only.
Section 4 of the Act requires a promoter to disclose the carpet area of the units for sale when a project registers. A builder can still print built-up or super built-up figures in a brochure, but the agreement has to state the carpet area.
Built-Up Area Explained
Built-up area has no legal definition, which is why, in any carpet area vs built up area comparison, it’s the number you need to question most.
The usual meaning is carpet area plus the thickness of the external walls, plus spaces only you can use: balconies, a utility area, sometimes an open terrace. In an apartment, built-up area tends to be 10–20% larger than carpet area. In a villa, where every floor has its own outer walls, stairs and often a lift shaft, the gap is wider.
When a brochure gives only built-up area, ask what’s inside it. Two homes of “1,500 sq ft built-up” can differ by 100 sq ft of usable floor.
Check this: ask whether the built-up figure includes balconies, terraces, the stair core and, in a villa, the basement or parking. A covered car park counted into built-up area can inflate a villa’s headline size by several hundred sq ft.
Super Built-Up Area and Loading
Super built-up area is the figure most Bangalore apartment prices used to be quoted on. It takes your built-up area and adds a share of the common areas.
The difference between carpet area and super built-up area is called loading. Builders usually express it as a percentage of carpet area. If a flat has 1,000 sq ft of carpet area and is sold as 1,300 sq ft super built-up, the loading is 30%.
In new Bangalore high-rises, loading of 25–35% is common, higher where there’s a big clubhouse or more lifts per floor. That isn’t always bad, but know what you’re paying for.
Here’s carpet area vs built up area vs super built-up for a 3 BHK flat, in our own round numbers:
| Measure | Area | As % of carpet |
|---|---|---|
| Carpet area | 1,000 sq ft | 100% |
| Built-up area (walls + 2 balconies) | 1,150 sq ft | 115% |
| Super built-up area (30% loading) | 1,300 sq ft | 130% |
If you’re choosing between flat sizes, our guide to 2 BHK vs 3 BHK in Bangalore compares the usable space you actually get at each budget.
Carpet Area vs Built Up Area in a Villa
Villas change the maths in two ways.
First, there’s very little common area to load. You don’t share a lift lobby or a corridor with anyone. The clubhouse is still shared, but most villa developers charge for it separately rather than loading it into your area. So super built-up area matters less, and the carpet area vs built up area gap becomes the one to watch.
Second, you own land. In an apartment, you get an undivided share (UDS) of the whole site, which you never see on the ground. In a villa, you should get a defined plot with fixed boundaries. That plot area is a separate number again, and for resale it’s often the most valuable one. Our guide to villa plots vs apartments explains why land holds value differently.
So for a villa you need four figures, not one: plot area, carpet area, built-up area, and whether a basement or car park is counted in any of them.
The NVT Oikos numbers: a worked carpet area vs built up area example
NVT Oikos is a 28-villa project in Pattandur Agrahara, Whitefield. Its developer, NVT Quality Lifestyle, publishes one villa type: 4,064 sq ft built-up on 1,840 sq ft of land. Each villa has a basement, a ground floor and two upper floors, with a private lift running through all four levels.
NVT doesn’t publish a carpet area on its website. One property portal lists the carpet area as 2,844 sq ft. We haven’t seen that in an NVT document, so treat it as reported. If it’s right, here’s how the numbers line up:
| Measure | Area | Source |
|---|---|---|
| Plot (land) area | 1,840 sq ft | NVT project page |
| Built-up area | 4,064 sq ft | NVT project page |
| Carpet area | 2,844 sq ft | Reported by one portal, not confirmed |
| Carpet as % of built-up | 70% | Our arithmetic |
| Built-up as multiple of plot | 2.2× | Our arithmetic |
A 30% carpet area vs built up area gap in a villa can look odd when there are no shared corridors. It isn’t, once you look at the floor plans. Each Oikos villa has external walls on four levels, a staircase that repeats on every floor, a lift shaft, light wells, two terraces on the second floor, balconies, and a double-height library nook on the first floor. Under the RERA definition, balconies and terraces don’t count as carpet area. A double-height void counts only once, on the floor where you stand.
The brochure for the project says “prices are based on carpet area” and that built-up and carpet area are computed in the sale agreement. That’s the right way round. It also means the carpet figure in your agreement is the one to check, not the 4,064 on the website. The full specification and floor-by-floor layout are on our NVT Oikos listing.
If you’re shortlisting other projects in the same area, our guide to villas in Whitefield compares what each developer publishes.
Converting the Price per Sq Ft
This is where the carpet area vs built up area difference costs real money. A low rate quoted on a big area can be more expensive than a high rate quoted on a small one.
The formula is simple: carpet rate = quoted rate × (quoted area ÷ carpet area).
Here’s what a quoted ₹10,000 per sq ft of super built-up area works out to, at different loadings:
| Loading on carpet | Super built-up for 1,000 sq ft carpet | Price at ₹10,000/sq ft | Real rate per sq ft of carpet |
|---|---|---|---|
| 20% | 1,200 sq ft | ₹1.20 Cr | ₹12,000 |
| 25% | 1,250 sq ft | ₹1.25 Cr | ₹12,500 |
| 30% | 1,300 sq ft | ₹1.30 Cr | ₹13,000 |
| 35% | 1,350 sq ft | ₹1.35 Cr | ₹13,500 |
Same quoted rate, same carpet area, and a ₹15 lakh spread. That’s the carpet area vs built up area problem in one table.
For a villa, do it three ways. Take NVT Oikos at the lowest reported price we found, ₹6.24 Cr (a portal figure, not NVT’s):
- Per sq ft of built-up area: ₹6.24 Cr ÷ 4,064 = about ₹15,350
- Per sq ft of reported carpet area: ₹6.24 Cr ÷ 2,844 = about ₹21,940
- Per sq ft of land: ₹6.24 Cr ÷ 1,840 = about ₹33,900
All three are correct. They answer different questions. Use the carpet rate to compare usable space with an apartment, and the land rate to compare with plotted developments nearby.
Location changes the rate as much as the measure does. Being a short drive from a Purple Line station is one reason Whitefield rates have held up; our guide to the Whitefield metro covers which stations are open.
Don’t forget the taxes. GST, stamp duty and registration are charged on the agreement value, whatever area it’s based on. Our post on registration charges in Karnataka sets out the current rates.
How Karnataka RERA Shows the Area
When a project registers with the Karnataka Real Estate Regulatory Authority, the promoter has to disclose the number, type and carpet area of the units for sale. That’s the figure the authority holds the builder to.
Search the project by name or registration number on the Karnataka RERA portal and open the unit-wise carpet area. Some uploads are scans, so you may need to open the attached files.
For NVT Oikos, the registration number is PRM/KA/RERA/1251/446/PR/250425/007694. If the carpet area in that record differs from the 2,844 sq ft one portal reports, go with the RERA record and ask the developer to explain the difference in writing.
The honest downside: the portal isn’t easy to use, and it won’t settle carpet area vs built up area for you, because it doesn’t explain the brochure’s built-up figure. Only the floor plans and the agreement do that.
Measuring Carpet Area Yourself
You can’t measure an under-construction home, but you can check carpet area vs built up area on the drawings. Ask for dimensioned floor plans and add up the rooms.
- List every room with its length and width from the plan, inside the walls.
- Multiply and add. Include toilets, kitchen, utility (if enclosed), passages and wardrobes.
- Leave out balconies, open terraces, shafts and the outer walls.
- Add roughly 5–8% for internal partition walls, which the RERA definition includes. That’s our rule of thumb, not a legal figure.
- Compare your total with the carpet area in the agreement. A small gap is normal. A gap above 5% needs an explanation.
At handover, repeat the exercise with a laser measure. If the area has shrunk, check the variation clause in your agreement. Many agreements allow a small tolerance and set out a refund or extra payment at the agreed rate beyond it.
If you’re paying in stages as the building rises, our guide to the construction linked payment plan explains when to raise area questions so you still have leverage.
A quick rule of thumb for apartments: carpet area is usually 70–80% of super built-up area, and built-up area is usually 10–20% above carpet. For villas, compare carpet with built-up directly; a gap of 25–30% isn’t unusual on three or four floors. Treat these as sanity checks, never as a substitute for the RERA figure.
Carpet Area vs Built Up Area: Questions to Ask Before You Sign
- What is the RERA carpet area of this exact unit? Ask for it in writing, by unit number.
- What does the built-up area include? Balconies, terraces, basement, car park, stair core.
- What is the loading percentage? For apartments, ask how the super built-up figure was calculated.
- Is the price per sq ft quoted on carpet or super built-up? Convert it to a carpet rate before comparing.
- For a villa, what is the plot area in the sale deed? And is it the same on the approved layout?
- Are balconies and terraces charged? Some builders price them separately at a lower rate.
- What does the agreement say about area variation? Find the tolerance and the refund rate.
- Are the floor plans dimensioned? You can’t check anything without room sizes.
FAQs on Carpet Area vs Built Up Area
What is the difference between carpet area vs built up area?
Carpet area is the usable floor inside your home, including internal partition walls. Built-up area adds the external walls and usually your balconies and private terraces. In an apartment the gap is often 10–20%; in a multi-storey villa it can be around 30%.
Is carpet area defined by law in India?
Yes. Section 2(k) of the RERA Act, 2016 defines it as net usable floor area, excluding external walls, service shafts, exclusive balconies and exclusive open terraces, but including internal partition walls.
What percentage of super built-up area is carpet area?
In most Bangalore apartments, carpet area is about 70–80% of super built-up area. That’s a rule of thumb. Check the actual figure in the RERA record and your agreement.
Are balconies included in carpet area?
No. Under the RERA definition, exclusive balconies, verandahs and open terraces are left out of carpet area, though builders often include them in built-up area.
Which matters more for a villa, carpet area vs built up area?
Use three: plot area for land value, carpet area for usable space, and built-up area only after you know what it includes. For NVT Oikos, NVT publishes 4,064 sq ft built-up on 1,840 sq ft of land.
Sources we checked (October 2026): the RERA Act, 2016, Section 2(k) and its explanation; NVT Quality Lifestyle’s Oikos project page and floor-plan brochure (built-up and land area, floors, lift, “prices are based on carpet area”); one property portal for the reported 2,844 sq ft carpet area and three portals for the reported prices, labelled as such above. Loading examples, rates and the partition-wall allowance are our own arithmetic.
This article is general information, not legal or financial advice. Measurement practice varies between builders and may change. Check the carpet area in the RERA record and your agreement for sale before you pay a booking amount.
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