Carpet Area vs Super Built-Up Area in Bangalore: What a Flat Buyer Pays For
Carpet area and super built-up area measure one flat in two different ways, and the distance between the two numbers decides how much home the price really buys. This guide covers the three area terms heard in Bangalore sales offices, the legal meaning of carpet area and a fair way to compare projects. It also covers what happens when the finished flat turns out smaller or larger than the agreement said.
The three area terms
Price sheets in the city usually quote a "saleable" size, which is the super built-up figure, and the registered agreement records the carpet size. Each term builds on the one before it, starting with the floor indoors and ending with a slice of the entire building.
| Term | What it counts | Where it appears |
|---|---|---|
| Carpet area | Usable floor indoors, with the partition walls between rooms | RERA registration and the registered agreement |
| Built-up area | The carpet figure with outer walls, balconies and the utility space added | Some floor plans and bank valuation reports |
| Super built-up area | The built-up figure with a slice of lobbies, corridors, lifts, stairs and the clubhouse added | Brochures, price sheets and most advertisements |
Only the first of these is defined in law. The other two are trade terms, and each developer decides which common spaces go into the saleable figure. Flats of quite different sizes can therefore carry an identical saleable number in two projects.
How RERA defines carpet area
The definition is in Section 2(k) of the Real Estate (Regulation and Development) Act, 2016. It counts the net floor that can be used within an apartment, together with the space taken by partition walls between rooms. Four things are left out of the measurement.
- External walls and the floor they cover
- Service shafts
- A balcony or verandah meant for the exclusive use of the flat
- An open terrace meant for the exclusive use of the flat
A developer applying for registration has to declare the number, type and carpet area of the apartments in the project. The same figure goes into the agreement for sale, where the total price is stated against the carpet area. Balconies and terraces are shown separately, so a large balcony adds to the price without adding to the carpet figure.
Loading and carpet efficiency
Loading is the name for whatever the saleable figure holds beyond the carpet figure. It pays for the walls, the balconies and each flat's slice of the shared spaces. The trade expresses it in two ways, and the two give different percentages for the same flat.
Consider a flat marketed as 1,300 sq ft whose carpet figure is 800 sq ft. The 500 sq ft of loading is about 38% of the saleable area, and it is about 62% when worked out on the carpet area. Ask which base a salesperson is using before comparing one figure with another.
A simpler measure is carpet efficiency: carpet size as a percentage of saleable size. In the example above it is about 62%. Anarock Research data for the first quarter of 2025 put the average loading in Bangalore at 41% of the saleable area, against 30% in 2019. That works out to carpet efficiency of about 59% for a typical new project.
Why loading has grown
Larger clubhouses, double-height lobbies, more lifts and wider corridors all add to the common area shared among the flats. A project with many amenities on a tight site will show a lower carpet efficiency than a plain building with a few flats on each floor. Higher loading is a cost of those shared spaces, and it also raises the monthly maintenance bill, which is charged on the saleable area in most projects.
Comparing flats on carpet rate
The rate per sq ft on a price sheet is a rate on the saleable area. To compare two projects, divide the total price of each flat by its carpet area. The example below takes a pair of flats that match on saleable size and quoted rate.
| Detail | Flat A | Flat B |
|---|---|---|
| Saleable area | 1,300 sq ft | 1,300 sq ft |
| Quoted rate | Rs. 9,000 per sq ft | Rs. 9,000 per sq ft |
| Price | Rs. 1.17 Crore | Rs. 1.17 Crore |
| Carpet area | 845 sq ft | 780 sq ft |
| Carpet efficiency | 65% | 60% |
| Rate on carpet area | About Rs. 13,850 per sq ft | Rs. 15,000 per sq ft |
The pair looks identical in the developer's quote, yet Flat A has 65 sq ft more usable floor, which is the size of a small study. On carpet area, Flat B costs about 8% more for each square foot. The figures are an illustration, and the same sum works for any pair of flats on a shortlist.
Karnataka RERA's portal carries the carpet size of every unit type in a registered project, under the project's details. Checking it there takes a few minutes and removes any doubt about the number quoted at the sales office. Our pages for apartments in Whitefield and other localities show the sizes that developers publish, which are saleable areas unless stated otherwise.
When the delivered area differs
The model agreement for sale under the RERA rules deals with a change in carpet area directly. The developer confirms the final carpet area after construction is complete and the occupancy certificate is granted. The total price is then worked out again at the agreement's own rate for each square foot.
The two outcomes are set out below.
- A smaller final figure: the developer refunds the excess amount within 45 days, with interest at the rate prescribed in the rules
- A larger final figure: the developer may ask for the extra amount, and the increase is capped at 3% of what was agreed
In Karnataka the prescribed interest rate is the State Bank of India's highest marginal cost of lending rate plus 2%. A buyer who suspects a shortfall should have the flat measured at handover, before signing the possession letter. Section 14 of the Act also bars changes to the sanctioned plan and the flat's layout without the buyer's written consent, apart from minor alterations.
Where each area figure is used
Different parts of a purchase run on different area figures, and mixing them up leads to wrong sums. The list below shows which figure applies where.
- Price in the agreement: stated for the flat on its carpet area, with balcony, terrace and parking shown separately
- Maintenance: usually billed per sq ft of saleable area, as set out in the agreement
- Undivided share of land: linked to the size of the flat in proportion to the whole project
- Bank valuation: the valuer measures the flat and reports the carpet and built-up areas
- Furniture and interiors: planned from the room dimensions on the floor plan
Stamp duty and the registration fee follow the property's value, with the government's guidance value as the floor. In Karnataka the duty on a home above Rs. 45 Lakhs works out to about 5.6% with cess and surcharge, and registration is 2%. The EMI calculator adds these costs to the loan sums for any price.
Checks before booking
A few questions at the sales office settle the area question early. Ask for the answers in writing, on the cost sheet or by email.
- Get three separate numbers for the exact unit: carpet, balcony and saleable
- Match the carpet number with Karnataka RERA's record for that unit type
- Divide the all-in price by the carpet number and compare that rate across the shortlist
- Read the room dimensions on the floor plan, since equal carpet figures often hide very different room sizes
- Check which area the maintenance charge and the corpus are billed on
- Confirm that the agreement carries the standard clause on a change in carpet area
A walk through the model flat helps, though model flats are often built without doors and with slim furniture. Measure a bedroom with a tape and compare it with the plan. Our team is glad to pull the carpet areas for any project on a shortlist through the contact page.
