Super Built-Up Area vs Carpet Area vs Saleable Area in Bangalore: What You Actually Pay For

Published: 10 September 2026 | Updated on: 10 September 2026 | By L K Monu Borkala, CEO & Founder, OneCity Property — 15 years of property consultancy experience and over 20 years in marketing and management at OneCity Technologies Pvt. Ltd.

What Is Carpet Area?

Carpet area is defined under Section 2(k) of the Real Estate (Regulation and Development) Act, 2016 (RERA) as the net usable floor area of an apartment, excluding the area covered by external walls, areas under service shafts, exclusive balcony or verandah area, and exclusive open terrace area. In plain terms, it is the area within your apartment walls where you can physically lay a carpet.

Carpet area includes: all bedrooms, the living room and dining room, the kitchen, bathrooms and toilets, store rooms, and the thickness of internal partition walls between these rooms. It does not include: external walls (the thick outer walls of the building), balconies (open or enclosed), terraces, flower beds, and service ducts or shafts for plumbing and electrical conduits.

This is the number that matters most when you are comparing apartments. Two builders may both advertise a "1,200 sq ft 2BHK," but if one is quoting carpet area and the other is quoting super built-up area, the actual living space could differ by 300-400 sq ft. Under Karnataka RERA rules, the carpet area figure in a registered project can be verified on the K-RERA portal against the approved floor plan.

What Is Built-Up Area?

Built-up area is the carpet area plus the thickness of the external walls and the area of the balcony or verandah attached to that apartment. There is no standardised legal definition of built-up area under RERA, which means different builders may calculate it slightly differently depending on how they treat balconies, utility ledges, and wall projections.

A rough rule of thumb used across the Indian real estate industry: built-up area is approximately 10-20% more than carpet area. If your carpet area is 1,000 sq ft, the built-up area is likely somewhere between 1,100 and 1,200 sq ft. The exact percentage depends on the wall thickness (6-inch vs 9-inch external walls make a difference) and the size of balconies in the design.

What Is Super Built-Up Area (Saleable Area)?

Super built-up area, also called saleable area, is the built-up area of your apartment plus your proportionate share of all common areas in the building. These common areas include: entrance lobbies, lift wells and lift lobbies on each floor, staircases, corridors and passages, club house area (in some calculations), generator room, water pump room, security cabin, common toilets, and any other area not exclusively assigned to a specific apartment.

This is the number that was historically used by builders to price apartments in Bangalore and across India before RERA. Because the super built-up area is always substantially larger than the carpet area, quoting a price per sq ft on super built-up area made the per-sq-ft rate look lower, even though the total cost remained the same.

For example: a builder advertising Rs 6,000 per sq ft on 1,300 sq ft super built-up area charges Rs 78 lakh total. The same apartment has 1,000 sq ft carpet area. On carpet area, the effective rate is Rs 7,800 per sq ft. The total price is identical, but the per-sq-ft number looks very different. This is why RERA mandated that all sales must be conducted on carpet area.

The Loading Factor: How Much Extra Are You Paying For?

The loading factor is the percentage by which the super built-up area exceeds the carpet area. It represents the proportion of common areas allocated to your apartment.

Formula: Loading Factor (%) = ((Super Built-Up Area - Carpet Area) / Carpet Area) x 100

Alternatively: Super Built-Up Area = Carpet Area x (1 + Loading Factor)

Bangalore loading factors by project type:

Budget and mid-segment apartments: 25-30% loading. These projects typically have fewer amenities and simpler common area designs.

Premium apartments with club house and multiple amenities: 30-38% loading. Larger lobbies, dedicated gym floors, and swimming pool areas increase the common area share.

Luxury and ultra-luxury projects: 35-45% loading. Double-height lobbies, concierge areas, multiple lifts per tower, and extensive landscaped common areas push loading higher.

A lower loading factor means better value for the buyer, because you are getting more usable space per rupee. When comparing two projects at similar price points, the project with the lower loading factor gives you more carpet area for the same total cost. Always ask the builder for the exact loading factor and verify it against the RERA registration documents which include approved floor plans with area breakdowns.

RERA Karnataka: Carpet Area Pricing Is Mandatory

The Real Estate (Regulation and Development) Act, 2016 brought a fundamental change to how apartments are sold in India. Under Sections 4 and 13 of the Act, all property sales in Karnataka must be based on carpet area, not super built-up area. This applies to all RERA-registered projects (those with more than 8 apartments or land area exceeding 500 square metres).

What this means in practice:

Every advertisement, brochure, and marketing material must disclose the carpet area of each apartment type.

The allotment letter and agreement for sale must specify the price per square foot based on carpet area.

The stamp duty and registration charges are calculated on the total sale consideration, which is derived from carpet area pricing.

If the actual carpet area at the time of possession is less than what was promised in the agreement, the builder must refund the difference with interest.

The 3% variation rule in Karnataka: Under Karnataka RERA Rule 8A (Annexure-A, Clause 1.7), the builder can charge extra only if the carpet area increases by up to 3% from the agreed figure. Any reduction in carpet area, regardless of the percentage, must be refunded to the buyer. This rule specifically caps the builder's ability to charge more but places no cap on refunds for shortfall.

Despite RERA mandating carpet area pricing, some builders in Bangalore still display super built-up area prominently in their marketing alongside the RERA-compliant carpet area figure. This is not technically a RERA violation as long as the carpet area is also clearly disclosed and the pricing is based on carpet area. But it can confuse buyers who are not paying close attention to which number they are comparing.

How to Compare Two Bangalore Apartments Correctly

Here is the only correct way to compare the value of two apartments:

Project A: Rs 95 lakh total, carpet area 1,050 sq ft, super built-up 1,380 sq ft
Price per sq ft on carpet area: Rs 9,048
Loading factor: 31.4%

Project B: Rs 90 lakh total, carpet area 950 sq ft, super built-up 1,330 sq ft
Price per sq ft on carpet area: Rs 9,474
Loading factor: 40%

Project A looks more expensive at Rs 95 lakh total, but per sq ft of carpet area it is actually cheaper (Rs 9,048 vs Rs 9,474), and it gives you 100 sq ft more usable living space. Project B has a higher loading factor (40% vs 31.4%), meaning a larger share of your money goes toward common areas you do not exclusively use. The EMI impact of the Rs 5 lakh difference may be modest, but the 100 sq ft of extra living space is permanently yours.

Always anchor your comparison to carpet area. Ignore super built-up numbers when choosing between projects.

Parking Area: Is It Part of Super Built-Up?

This is one of the most common areas of confusion in Bangalore property purchases. The answer depends on the type of parking:

Covered car parking in a multi-level parking structure or stilt parking: This is typically not included in the super built-up area and is charged separately. The parking space is a distinct allocation, not part of the apartment area calculation.

Open parking: Usually not included in any area calculation and may be charged separately or included in the base price depending on the project.

Basement parking: Generally excluded from super built-up area, but builders may include the ramp area or common parking circulation in the common area share. Always verify this with the builder's area breakup sheet.

Under RERA, parking cannot be included in the carpet area of the apartment. If a builder is adding parking area to inflate the carpet area figure, that is a violation. Check the approved floor plans on the K-RERA portal to verify what is and is not included in the declared carpet area for your unit.

Balcony and Utility Area Treatment

RERA explicitly excludes exclusive balcony and verandah area from carpet area. However, balconies are part of the built-up area (and by extension, the super built-up area). This creates a situation where two apartments with identical carpet area but different balcony sizes will have different built-up areas.

Utility areas (also called service balconies or wash areas) attached to the kitchen are treated differently across projects. If the utility area is enclosed with walls, it may be included in the carpet area. If it is open or partially open (like a washing machine balcony with a low parapet wall), it is treated as a balcony and excluded from carpet area. Verify the classification for your specific unit with the builder's architect.

Flower beds, air conditioning unit ledges, and other projections outside the main wall line are never part of carpet area or built-up area, though some older pre-RERA projects attempted to include these. For ongoing Bangalore projects, check the area statement in the approved building plan filed with BBMP to see exactly what is counted.

What to Verify in Your Sale Agreement

Before signing the agreement for sale of any apartment in Bangalore, verify these specific area-related details:

1. Carpet area in the agreement matches the RERA-registered carpet area. Cross-check against the project details on the K-RERA portal. Any discrepancy should be flagged before signing.

2. Price per sq ft is stated on carpet area basis. The agreement must clearly show the rate per sq ft applied to the carpet area to arrive at the base price. If only the total price is mentioned without the per-sq-ft rate, ask for the breakup.

3. Area variation clause specifies the 3% cap and refund obligation. The agreement should state that the builder will refund on a pro-rata basis if the actual carpet area at possession is less than the agreed area. For increases, the builder can charge extra only up to 3% increase in area.

4. Common area allocation methodology is disclosed. Ask how the common area share is calculated for your unit. Is it proportionate to carpet area, or to some other metric? This affects your super built-up area and potentially your maintenance charges, since many societies calculate property tax and maintenance on super built-up area.

5. Parking is separately identified and priced. Confirm the parking allocation is not bundled into the apartment area calculation. If parking is included in the total price, it should be a line item, not absorbed into a higher per-sq-ft rate on carpet area.

Why Some Builders Still Quote Super Built-Up Area

Despite RERA mandating carpet area pricing, you will still encounter super built-up area numbers prominently displayed in Bangalore property marketing. There are three common reasons:

Larger number psychology: A "1,350 sq ft apartment" sounds bigger than a "1,000 sq ft apartment" even though they are the same physical unit. First-time buyers who do not understand the distinction may be drawn to the larger number.

Lower per-sq-ft rate perception: Quoting Rs 6,500/sq ft on super built-up looks cheaper than Rs 8,775/sq ft on carpet area. Both yield the same total price, but the lower number attracts attention in advertisements and online property listings.

Comparison with older projects: Pre-RERA projects were always quoted on super built-up area. When a buyer is comparing a new RERA project (carpet area pricing) with resale flats from older projects (super built-up area pricing), the RERA project appears more expensive per sq ft unless the buyer converts both to the same basis. For resale flat purchases, review the guidance value for the specific locality and calculate on carpet area to get a fair comparison.

As long as the builder also discloses carpet area and prices the agreement on carpet area, displaying super built-up area in marketing is not a RERA violation. But you as the buyer should mentally discard the super built-up number for all comparison and budgeting purposes.

Impact on Property Tax and Maintenance Charges

In Bangalore, BBMP property tax is calculated based on the built-up area of the apartment (not carpet area, and not super built-up area). The built-up area for tax purposes is determined by BBMP based on the approved building plan. This is a separate calculation from the builder's area statements and may not match exactly.

Apartment maintenance charges, on the other hand, are usually calculated on the super built-up area by the residents' welfare association or apartment owners' association. This means apartments with the same carpet area but different loading factors will pay different maintenance charges. A flat with a 40% loading factor pays more maintenance per month than a flat with a 30% loading factor, even if both have the same carpet area and the same maintenance rate per sq ft.

When budgeting for the total cost of ownership (not just the purchase price), factor in these ongoing costs. The Karnataka stamp duty calculator can help estimate registration costs, and the property tax transfer process should be completed promptly after possession to avoid arrears.

Practical Tips for Bangalore Apartment Buyers

1. Ask every builder for the carpet area, not the super built-up area. If they lead with super built-up, ask for the carpet area figure and the loading factor in writing.

2. Visit the K-RERA portal and look up the project registration. The registered details include unit-wise carpet area breakdowns for the approved floor plans. If the builder's brochure says 1,050 sq ft carpet but the RERA filing says 980 sq ft, question the discrepancy.

3. For resale purchases (where RERA may not apply if the original project is old), hire a qualified architect to measure the actual carpet area before agreeing on a price. Resale transactions involving properties where both buyer and seller need to understand TDS obligations and capital gains tax implications should factor in the correct area for price-per-sq-ft comparisons.

4. Compare at least 3-4 projects in the same locality on price per sq ft of carpet area. This is the only metric that gives a fair value comparison across projects with different loading factors.

5. Check if the builder charges separately for parking, club house membership, maintenance deposit, and other items. These are not part of the carpet area price but add to your total outgo.

Frequently Asked Questions

What is the difference between carpet area and super built-up area?

Carpet area is the actual usable floor space inside your apartment, measured from the inner surfaces of the walls. Super built-up area is the carpet area plus wall thickness plus your proportionate share of common building spaces like lobbies, lifts, staircases, and corridors. In Bangalore, the super built-up area is typically 30-40% larger than the carpet area depending on the project's amenity level and design.

What does RERA say about carpet area pricing?

Under Sections 4 and 13 of the RERA Act, 2016, all property sales must be priced based on carpet area, not super built-up area. This applies to all RERA-registered projects in Karnataka. The builder must disclose carpet area in all advertisements, allotment letters, and sale agreements. K-RERA enforces this through its complaint mechanism at rera.karnataka.gov.in.

What is a good loading factor for apartments in Bangalore?

A loading factor of 25-30% is considered efficient for mid-segment Bangalore apartments. Premium projects typically have 30-38% loading, and luxury projects can go up to 45%. Anything above 40% for a non-luxury project should be questioned, as it means less than 60% of the area you are paying for is your personal living space.

How do I calculate carpet area from super built-up area?

Carpet Area = Super Built-Up Area / (1 + Loading Factor). If the super built-up area is 1,300 sq ft and the loading factor is 30%, carpet area = 1,300 / 1.30 = 1,000 sq ft. Always ask the builder for the exact loading factor rather than using estimates, as it varies significantly between projects.

Is parking included in the super built-up area?

Covered or basement parking is generally not included in the super built-up area and is priced separately. However, common parking circulation areas (ramps, driveways) may be included in the common area share that forms part of the super built-up calculation. Open parking is excluded entirely. Verify the specific treatment with the builder's area breakup sheet and the approved building plan.

Are balconies included in carpet area?

No. Under the RERA definition, exclusive balconies, verandahs, and open terraces are excluded from carpet area. They are part of the built-up area. Enclosed utility balconies (with full walls) may sometimes be included in carpet area depending on the building plan classification. Check the approved plan for your specific unit.

What happens if the actual carpet area is less than the agreement?

Under Karnataka RERA Rule 8A, the builder must refund the proportionate amount with interest for any shortfall in carpet area. There is no minimum threshold for this refund. For increases, the builder can charge extra only up to a 3% increase in carpet area. Buyers can file a complaint with K-RERA (Form N, Rs 1,000 fee) if the builder refuses to refund for a carpet area shortfall.

Should I compare properties on carpet area or super built-up area?

Always compare on carpet area. Price per square foot of carpet area is the only honest metric for comparing value across different projects. Super built-up area varies wildly depending on the loading factor, so a flat quoted at Rs 6,000/sq ft on super built-up may be more expensive per sq ft of actual living space than a flat quoted at Rs 8,500/sq ft on carpet area. Calculate the carpet area price for every project before making a decision.