Carpet Area vs Super Area - What Can a Builder Charge?

Many families who bought flats in the NCR before 2017 had the same unpleasant surprise at possession: the "1,650 square foot" flat they'd paid for felt much smaller once they walked in. And then came a letter saying the area had "increased" to 1,720 square feet, with a demand for several lakh rupees more. The flat hadn't grown. What had changed was a number called super area.

This guide explains the different ways builders measure flats, how RERA changed the rules, what a builder can and can't charge for, and how to check whether you're paying for what you actually get.

Three different areas

Carpet area

The space you can actually use inside your flat. RERA defines it in Section 2(k) as the net usable floor area of an apartment, excluding the area covered by the external walls, areas under service shafts, exclusive balcony or verandah area and exclusive open terrace area, but including the area covered by the internal partition walls. In simple terms: measure the floor inside your flat, wall to wall, including the space under internal walls between rooms, but not the outer walls, the balcony or the shafts.

Built-up area

Carpet area plus the thickness of the external walls, and often the balcony and other areas belonging only to your flat. There's no single statutory definition, so different builders have calculated it differently.

Super area (or super built-up area, or saleable area)

Built-up area plus a proportionate share of the common areas of the building or project: lobbies, staircases, lift wells, corridors, the clubhouse, sometimes even the guardroom and the sewage treatment plant. Again, no statutory definition, and every builder had its own method.

The ratio between super area and carpet area is often called the loading factor. In many older NCR projects, super area was 25% to 45% higher than carpet area, and sometimes more. So a flat with 1,200 square feet of carpet area could be sold as a 1,650 square foot flat.

Why super area pricing caused so many disputes

• You couldn't check it. Super area depends on how the builder allocates common areas across all flats, which buyers have no way to verify.
• It could change. Agreements typically said the super area was "tentative" and could change on completion, with a price adjustment. Increases at possession were common; decreases were rare.
• It hid the real size. Two flats advertised at the same super area could have very different carpet areas if the builders used different loading factors.
• It made price comparisons misleading. A lower price per square foot of super area could actually mean a higher price per square foot of usable space.

What RERA changed

The Real Estate (Regulation and Development) Act, 2016 tackled this directly:

• A statutory definition of carpet area, in Section 2(k), so there's one standard everyone uses.
• Disclosure of carpet area of each unit at registration, on the project's public page.
• Sale on carpet area. The agreement for sale, in the form prescribed by each state's rules, states the carpet area of the unit and the price is based on it. The super area method of pricing has, in effect, been replaced.
• Common areas belong to everyone. Section 2(n) defines common areas, and the promoter must convey the undivided share in them to the association. They aren't something the builder can sell to you again as "area".

Many state model agreements also deal with changes in carpet area at completion. In broad terms, if the final carpet area is less than what was agreed, the builder must refund the excess paid, with interest; if it's more, the builder can charge for a limited increase, commonly up to about 3% of the carpet area, at the same rate, and anything beyond that needs your agreement. Check the exact clause in your agreement and your state's model form.

What about older agreements on super area?

If you signed an agreement before RERA priced on super area, and your project was ongoing in 2017, the Act still applies to it, as the Supreme Court confirmed in Newtech (2021). But your agreement may still describe the price in terms of super area. How do authorities deal with increases in such cases?

Broadly, they've asked whether the increase is real and justified:

• Has the carpet area of your flat actually increased? If not, an increase in "super area" is just a reallocation of common areas on paper, and buyers have successfully challenged such demands.
• Has the builder shown how the increase was calculated, with reference to the approved plans and the revised layout?
• Did the increase come from extra common facilities that were actually built, and that the agreement allowed to be charged for?
• Was the increase within any limit the agreement set?

A builder that can't answer these questions with documents is on weak ground. Authorities have often directed builders to justify super area increases with the approved plans, and disallowed them where they couldn't. See extra charges.

How to check your flat's real size

1. Find the carpet area stated in your agreement, allotment letter, or on the project's RERA page.
2. Measure your flat, room by room, wall to wall, including the space under internal walls. Exclude the external walls, the balcony and any shaft areas. Add it up.
3. Compare. Small differences are normal; construction isn't precise to the inch, and different measuring methods give slightly different answers. A difference of several percent, especially a shortfall, is worth raising.
4. Ask for the approved plan of your floor and flat, which shows the dimensions.
5. For a precise answer, have an architect or surveyor measure the flat and certify the carpet area. Associations sometimes do this for a sample of flats.

What a builder can legitimately charge

Apart from the price of the flat based on carpet area, an agreement can provide for certain other charges, if they're clearly stated. Common ones:

• Exclusive balcony and terrace areas, which are excluded from carpet area but belong to your flat, are often listed separately in the agreement, and their pricing is set out there.
• Covered parking (garages), which can be allotted and charged for. Open parking areas, by contrast, are common areas under Section 2(n) and generally can't be sold separately. The Supreme Court took a similar view of open and stilt parking under Maharashtra's older flat law in Nahalchand Laloochand v. Panchali Co-operative Housing Society (2010).
• Preferential location charges for corner units, park-facing units or higher floors, if the agreement provides for them and the location benefit is real.
• External and infrastructure development charges (EDC and IDC in Haryana), if the agreement passes them on and the amounts are as levied by the government.
• Club membership, if agreed.
• Power backup and electricity connection charges, if agreed, and reasonable.
• Maintenance deposits and advance maintenance, as the agreement allows.
• Taxes as applicable by law, and stamp duty and registration charges at the time of conveyance.

The test is always: is it in the agreement, is it clearly stated, and is the amount justified?

What a builder usually can't charge

• An increase in "super area" without a real increase in carpet area or a clear, justified basis in the agreement and approved plans.
• Open parking as a separately sold item.
• Charges not in the agreement, such as new "development charges" or "infrastructure charges" introduced at possession.
• The builder's own costs or penalties passed on to buyers, such as interest the builder owes the development authority on its own unpaid land dues, or penalties for its own delays.
• Interest on your instalments at a higher rate than the prescribed rate, or for periods when the builder itself was in default.
• Holding charges for a period when the builder hadn't made a valid offer of possession.
• Maintenance for periods before a valid offer of possession.

If you're facing such demands, pay what's clearly due, object in writing to the rest, and take advice. Authorities can direct the builder to hand over possession on payment of the undisputed amount. See maintenance disputes.

An example

Here's a made-up example. Rakesh bought a flat in Noida in 2012, under an agreement describing it as 1,650 square feet of super area at Rs 4,000 per square foot, or Rs 66 lakh. The agreement mentioned the carpet area only in a schedule: 1,180 square feet. At possession in 2022, the builder says the super area is now 1,725 square feet and demands Rs 3 lakh more.

Rakesh measures the flat: about 1,175 square feet of carpet area, consistent with the schedule. He writes to the builder asking how the 75 square foot increase was calculated and for the approved plans. The builder replies vaguely about "additional common areas". He files a UP RERA complaint, along with his delay interest claim. The authority directs the builder to justify the increase with the approved plans; when it can't show any additional common facility beyond the original layout, the authority disallows the demand.

The lesson: an increase in super area, without an increase in your carpet area or a real, documented reason, is worth challenging.

Comparing prices properly

If you're buying now, always compare prices on carpet area. If a seller quotes per square foot of super area, ask for the carpet area and work out the real price:

Price per square foot of carpet area = total price ÷ carpet area

Two flats priced at Rs 8,000 per square foot of super area can differ widely in real cost if one has a loading of 25% and the other 45%. On carpet area, the first works out to Rs 10,000 per square foot; the second to Rs 11,600. Resale flats in older projects are still often quoted on super area; ask for the carpet area every time.

Balconies, terraces and other extras

Because RERA's carpet area excludes exclusive balconies and terraces, agreements now usually list them separately, with their own area figures. That's fine, as long as you know what you're paying for. Some points to check:

• Is the balcony area stated, and is it priced at the same rate as the carpet area or differently?
• Is a "terrace" really exclusive to your flat, or part of the common roof? A top-floor buyer sold "terrace rights" over a common roof may face disputes with the association later.
• Are "service areas", such as a utility balcony or a dry balcony, included or listed separately?
• Does the floor plan in the agreement match the flat you're shown?

Plots and commercial units

For plots, the equivalent question is the plot area in the approved layout. Measure it on the ground at possession. A plot smaller than allotted entitles you to a proportionate refund with interest; a demand to pay for a larger plot should be checked against the layout and your agreement. For shops and offices, commercial agreements sometimes still use super area or "covered area"; ask for the carpet area as defined by RERA and compare. Food court and retail units in malls often carry very high loading, which affects both price and future rental value. See plot and commercial buyers.

Maintenance is often charged on super area

Even after RERA, maintenance charges are frequently levied per square foot of super area, because they pay for the common areas. That's not necessarily wrong, but it means a super area figure still matters to you after possession. If the builder has inflated your super area, you may pay more maintenance for years. Associations taking over maintenance can revisit how charges are calculated, and some have moved to carpet area-based or flat-type-based charging.

The common areas you're already paying for

Super area pricing worked by charging each buyer for a share of the common areas. RERA takes a different view: the common areas belong collectively to the buyers, and the promoter must convey the undivided share in them to the association of allottees under Section 17. Section 2(n) lists what counts, which includes, among other things:

• the entire land of the project, or of the phase;
• staircases, lifts, staircase and lift lobbies, fire escapes, and common entrances and exits;
• common basements, terraces, parks, play areas, open parking areas and common storage spaces;
• premises for the lodging of persons employed for the management of the property, including security staff;
• installations for central services such as electricity, gas, water and sanitation, air-conditioning and incinerators, and systems for water conservation and renewable energy;
• water tanks, sumps, motors, fans, compressors, ducts and all apparatus connected with installations for common use; and
• all community and commercial facilities as provided in the real estate project.

Two consequences follow. First, a builder can't take back or separately sell what the Act treats as common areas, such as open parking or a terrace that's part of the common roof. Second, any change to common areas after units are sold needs the consent of at least two-thirds of the allottees under Section 14(2). An extra tower in the park, a clubhouse reduced to a gym, or a basement converted to shops are all changes that need that consent. See plan changes.

Before you sign: questions to ask

• What is the RERA carpet area of the unit, and where is it stated in the agreement?
• What other areas belong exclusively to the unit, such as balconies or a terrace, and how are they priced?
• What's the total price, and what does it include?
• What other charges will be payable, and when? Are they fixed or "as applicable"?
• Is parking a covered garage allotted to me, or an open space?
• What happens if the final carpet area is more or less than agreed?
• How will maintenance be charged, and on what area?

If the answers aren't in the agreement, ask for them in writing before paying more than the booking amount. See agreement review.

Resale buyers and older flats

If you're buying a resale flat in an older project, the seller and the broker will almost always quote the super area, because that's what's in the original documents. Ask for the carpet area too, and if the original agreement doesn't show it clearly, measure. Compare prices on carpet area with other flats you're considering. Also check whether the seller paid any super area increase at possession, and whether that's in dispute, because an unresolved demand can follow the flat.

For conveyance, the sale deed in older projects often describes the flat by super area. That's not unusual, but your deed should also describe the carpet area if possible, and your share in the common areas should be stated or follow from the declaration filed for the building.

For developers

Developers sometimes see the carpet area rule as a marketing problem: carpet area numbers look smaller than the super area numbers buyers were used to. In practice, transparency on carpet area reduces disputes at possession, which are expensive to fight and damaging to reputation. Developers with older agreements on super area should be ready to justify any area increase with the approved plans and a clear calculation, and should consider whether demanding it is worth the dispute. Authorities have been sceptical of unexplained increases. See builder defence.

Area and stamp duty

At registration of the conveyance deed, stamp duty is calculated on the value of the property, which in most states is the higher of the agreed price and the government's circle or ready-reckoner rate applied to the area. If the circle rate is applied to an inflated super area, you may pay more stamp duty than necessary. Check how the area is described in the deed and how the value has been worked out before you sign.

The short version

Carpet area is the space you use. Super area is a number that includes a share of the common areas, which you'll own collectively anyway. RERA requires sale on carpet area. If your builder asks for more money because the super area "increased" while your flat stayed the same size, ask for the basis, check the plans, and challenge it if there isn't one.

What to do if you think you've been overcharged

1. Collect the documents: the agreement, the allotment letter, the floor plan, the final demand, and any letters explaining the area change.
2. Measure the flat, or have it measured.
3. Write to the builder asking for the calculation of any area increase, with reference to the approved plans, and for a copy of the plans.
4. Pay the undisputed amount, if you want possession, and record in writing that you're paying the disputed amount under protest, or not paying it.
5. Complain to RERA if the builder doesn't justify the charge. Include the area dispute in a wider complaint about delay interest or other charges, if you have one.
6. Act with other buyers if the same increase has been applied across the project. It usually has, and a group complaint is more effective.

Where you've already paid an unjustified area increase, you can ask for a refund with interest. See extra charges.

Frequently asked questions

What is carpet area under RERA?

The net usable floor area inside your flat, excluding external walls, service shafts, and exclusive balconies and terraces, but including internal partition walls, as defined in Section 2(k).

What is super area?

Built-up area plus a share of common areas such as lobbies, stairs and lifts. It has no statutory definition and was widely used for pricing before RERA.

Can a builder still sell on super area?

Under RERA, units are sold on carpet area. Older agreements may still use super area, but increases must be justified.

The builder says my super area has increased. Do I have to pay?

Only if the increase is real, justified by the approved plans, and allowed by your agreement. An increase without any change in carpet area is often challengeable.

What if my carpet area is less than agreed?

You're generally entitled to a proportionate refund, with interest under many state model agreements.

Can the builder charge for open parking?

Generally not. Open parking areas are common areas. Covered garages can be allotted and charged for.

How do I measure carpet area?

Measure the floor wall to wall inside the flat, including under internal walls but excluding external walls, balconies and shafts. For precision, use an architect or surveyor.

What is a loading factor?

The ratio of super area to carpet area. A loading of 35% means super area is 35% more than carpet area.

A general guide to carpet area, super area and builder charges under the Real Estate (Regulation and Development) Act, 2016. State model agreements and authority practice on area variations differ. This article isn't legal advice for your specific situation.