Carpet Area vs Super Built-up Area: RERA Rules and Real Examples (2026)

Carpet area is the floor you can actually use inside your flat, measured wall to wall with internal walls included, as defined in section 2(k) of the RERA Act, 2016. Super built-up area adds the outer walls, balconies and your share of lobbies, lifts, stairs and other common spaces, so it is always the larger number. In the listings on our site, carpet area runs at 56.6% to 69.0% of the larger figure, which means the same price can buy very different amounts of usable floor.

This guide sets out the legal definition, the three area terms you will meet in Lucknow, how loading is worked out, and how to compare a carpet-area flat with a super built-up flat without being misled by the price per square foot.

What is carpet area under the RERA Act?

Section 2(k) of the Real Estate (Regulation and Development) Act, 2016 defines carpet area as the net usable floor area of an apartment. The definition then lists what is left out and what is kept in.

The Act explains that an exclusive balcony, verandah or open terrace is one attached to the usable floor of the flat and meant only for that buyer. These are yours to use, but they are not counted in carpet area. A developer may still list them separately in the agreement, and you should check that they are listed.

Why carpet area is the figure that matters in Uttar Pradesh

The model agreement for sale under the UP RERA agreement rules of 2018 fixes the total price of an apartment on its carpet area. It also sets out what happens if the area changes during construction:

• After completion, the developer must confirm the final carpet area allotted to you.
• If the carpet area has shrunk, the developer must refund the excess money within 45 days, with interest at the rate in the rules.
• If it has grown by not more than 3%, the developer may ask for the extra amount at the next milestone of the payment plan.
• All such adjustments are made at the same rate per square foot agreed in the contract.

For example, the 858 sq ft carpet-area 2 BHK at Eldeco Skywalk could at most grow by about 25.7 sq ft, and any growth would be billed at the agreed rate per square foot of carpet area. These figures are illustrations of the rule, not a statement about that project.

Built-up and super built-up area: the industry terms

The RERA Act does not define built-up or super built-up area. They are trade terms, and developers do not all calculate them the same way. In general use:

• Built-up area is carpet area plus the external walls, the space under shafts and your exclusive balconies or terraces. It is the full footprint of your flat.
• Super built-up area, also called saleable or super area, is built-up area plus a share of common areas: entrance lobbies, corridors, lift wells, staircases and often the clubhouse or other amenity buildings.

The difference between super built-up area and carpet area is called loading. A developer that quotes super built-up area should be able to tell you the loading, and the carpet area behind the headline figure. Because the share of common areas is a calculation, two projects with the same super built-up area can give you quite different homes.

Carpet area vs super built-up area in real Lucknow listings

Some listings on our site give both figures for the same unit. They show how far apart the two numbers can be. The first two rows are new flats quoting super built-up area; the rest are resale listings that give a listed area alongside the carpet area.

Loading here is the extra area over carpet, divided by carpet area. On the Emaar Elara 3 BHK Luxury, every 100 sq ft of carpet comes with about 71 sq ft of walls, balconies and common space in the quoted figure. On the Parsvnath Planet penthouse, the extra is 45 sq ft per 100. Neither is right or wrong in itself; a large clubhouse and generous lobbies add to loading, and so do big balconies. What matters is that you know the number.

Price per square foot: carpet and super built-up give different answers

The same price divided by two different areas gives two very different rates. That is the most common reason buyers think one project is cheaper than another when it is not.

Prices are the developers' quoted base prices for new flats and the asking prices for resale listings, before stamp duty and registration. Rates are rounded to the nearest rupee.

Worked example 1: two 3 BHKs at about ₹2.8 crore

A 3 BHK at KSMB The Royal Retreat in Gomti Nagar Extension is quoted at ₹2.81 crore for 1,558 sq ft of carpet area, or ₹18,036 per sq ft of carpet. A 3 BHK at Rishita Serenity in Sushant Golf City is quoted at ₹2.79 crore for 3,050 sq ft of super built-up area, or ₹9,148 per sq ft of super built-up area.

On the face of it, the second flat is half the price per square foot. But the two rates measure different things. We do not have the carpet area of the Rishita Serenity flat, so here is what it would be across the range of ratios in our own listings:

• At a carpet share of 56.6%, the lowest we see, it would be about 1,726 sq ft of carpet, or roughly ₹16,162 per sq ft of carpet.
• At 69.0%, the highest we see, it would be about 2,105 sq ft of carpet, or roughly ₹13,257 per sq ft of carpet.

On either assumption the Rishita Serenity flat still offers more carpet per rupee, but the gap is far smaller than ₹9,148 against ₹18,036 suggests. The only way to settle it is to ask for the carpet area in writing.

Worked example 2: two 2 BHKs under ₹1 crore

The Eldeco Skywalk 2 BHK on IIM Road is quoted at ₹69.11 lakh for 858 sq ft of carpet area, which is ₹8,055 per sq ft of carpet. A ready 2 BHK at Rishita Manhattan in Gomti Nagar Extension is quoted at ₹90.06 lakh for 1,085 sq ft of super built-up area, which is ₹8,300 per sq ft of super built-up area.

The rates look close. Converted to carpet at the same 56.6% to 69.0% range, the Rishita Manhattan flat would have about 614 to 749 sq ft of carpet, at roughly ₹12,029 to ₹14,664 per sq ft of carpet. Again this is an estimate; the developer's own carpet figure is what you should compare. The two flats also differ in stage (one is ready, one is a new launch with possession listed for October 2029) and in location, so area is only one part of the decision. Our 2 BHK guide covers the rest.

How to compare per square foot honestly

1. Get the carpet area for every unit. For a RERA-registered project it appears in the registration and must appear in the agreement for sale. For resale, ask the seller for the original agreement or the builder's allotment letter.
2. Use the total price, not the base rate. Add parking, preferential location charges and any other compulsory charges the developer bills before possession. Stamp duty and registration come on top; see our stamp duty guide.
3. Divide by carpet area. The result is your real cost per usable square foot.
4. List the extras you get separately. Balconies, terraces, a servant room or a private lawn are real space even though they are not in carpet area. Note their sizes so you can weigh them.
5. Ask what the loading pays for. A higher loading may reflect a large clubhouse or wide corridors. Decide whether you value those, and whether the maintenance charge (usually billed on area) is fair.

Our property cost estimator adds stamp duty and registration to any price, so you can compare the full outlay as well as the rate.

Villas, plots and commercial units

The carpet area rule is written for apartments, and other types of property are usually quoted differently.

• Villas are often quoted on built-up area. The 2 BHK villas at Eldeco Solano Gardens list 1,193 to 1,690 sq ft of built-up area from ₹1.47 crore. Ask for the plot area as well, since the land is part of what you buy.
• Plots are sold by plot area. A Type A plot at JBBR Kanvas is 1,200 to 1,450 sq ft from ₹66 lakh. There is no loading to worry about, but check the plot's dimensions on the approved layout. Our plots guide goes further.
• Shops and offices in Lucknow's commercial projects are commonly quoted on super built-up area. Retail shops at Marigold Kailasha Awadh list 176 to 450 sq ft of super built-up area. For a shop, the carpet area is what sets how much display space you get, so ask for it.

Common mistakes with carpet and super built-up area

• Comparing a carpet rate with a super built-up rate. As the examples show, the gap can be close to double.
• Assuming balconies are in carpet area. Under section 2(k) they are not, even when they are exclusive to your flat.
• Taking a resale seller's area at face value. Resale listings usually quote the larger figure. Ask for the carpet area from the original agreement.
• Ignoring loading on maintenance. If the society bills maintenance on super built-up area, a high loading raises your monthly charge for the same usable space.
• Not checking the final area at possession. Under the UP agreement rules the developer must confirm the final carpet area, and a reduction should be refunded within 45 days.

For a broader view of what a flat costs across the city, see property rates in Lucknow, and for checking a project's registration before you rely on its areas, our guide on how to check UP RERA registration.

How we can help you compare areas

For every shortlisted flat we prepare a side-by-side sheet with the carpet area, the quoted area, the loading and the true price per square foot of carpet, using the developer's own figures. If you are weighing two or three homes, send us the units and we will put the numbers on one page, or read more about our advisory service.