Quick answer: carpet area is the usable floor area inside your home – the space where you can actually lay a carpet. Built-up area adds the walls (and often balconies). Super built-up area also adds a share of lobbies, lifts and amenities. Under RERA, homes must be sold on carpet area, so that is the number to compare. At Godrej Bandra Bay, 4 BHK homes are approx. 2,900–3,500 sq ft* carpet area.
Last updated: 29 October 2026. This guide explains general RERA definitions. Final areas for any project are those in its MahaRERA registration and agreement for sale. Details marked * are indicative.
When you compare luxury homes in Mumbai, the same flat can be described with three very different numbers. Older listings and resale brokers often quote super built-up area, while RERA-registered projects quote carpet area. Mixing them up can make one home look larger – or cheaper per sq ft – than it really is.
Carpet Area, Built-Up Area and Super Built-Up Area at a Glance
| Term | What it includes | Use it for |
|---|---|---|
| Carpet area (RERA) | Usable floor area inside the home, including internal partition walls; excludes external walls, service shafts, exclusive balcony and terrace | Comparing homes and price per sq ft |
| Built-up area | Carpet area + wall thickness + often balconies | Rough idea of the footprint |
| Super built-up area | Built-up area + a share of common areas (lobby, lifts, stairs, amenities) | Older listings – treat with care |
What Is Carpet Area Under RERA?
RERA defines carpet area as the net usable floor area of an apartment. It:
- Includes the area under internal partition walls of the apartment.
- Excludes external walls, service shafts, exclusive balcony or verandah, and exclusive open terrace.
Developers of RERA-registered projects must state carpet area in the registration and in the agreement for sale. Balconies and terraces, if any, should be shown separately. You can see the filed details on the MahaRERA website – our guide to the Godrej Bandra Bay RERA number explains how to search.
This definition comes from Section 2(k) of the Real Estate (Regulation and Development) Act, 2016. Because it is set by law, carpet area is the only one of the three numbers that means the same thing in every registered project.
Built-Up and Super Built-Up Area
Built-Up Area
Built-up area adds the thickness of the walls (and, in many listings, balconies) to the carpet area. There is no single fixed rule, so different sellers calculate it differently.
Super Built-Up Area
Super built-up area adds a proportionate share of common spaces – entrance lobby, lift lobbies, staircases, clubhouse and other amenities. It is a pricing number, not a living-space number. Two flats with the same super built-up area can have very different carpet areas.
What Is the Loading Factor?
Loading is how much bigger the super built-up area is than the carpet area, usually shown as a percentage. High loading means you pay for more common area per sq ft of usable home. Because RERA requires sale on carpet area, the simplest way to avoid confusion is to:
- Ask for the RERA carpet area of every home you compare.
- Ask separately for balcony, deck or terrace area.
- Work out the price per sq ft of carpet area.
Worked example: converting super built-up area to carpet area
| Step | Example |
|---|---|
| Resale flat advertised as | 4,000 sq ft super built-up |
| Loading assumed (example only) | 35% |
| Approx. carpet area = 4,000 ÷ 1.35 | About 2,960 sq ft |
| If the asking price is ₹30 Cr | ₹75,000 per sq ft super built-up, but about ₹1,01,000 per sq ft of carpet |
So a resale flat advertised as “4,000 sq ft” may have about the same usable space as a new home of approx. 2,900–3,000 sq ft carpet. Real loading varies a lot between buildings, so do not rely on an assumed figure. Ask for the carpet area in the original agreement and measure the rooms.
Illustration only. These numbers are not for any specific project.
How to Read a 4 BHK Size in Bandra West
In Bandra West, you will see a mix of new RERA projects quoting carpet area and older resale flats quoting built-up or super built-up area. So a resale 4 BHK listed at a large number may have noticeably less usable space than a new 4 BHK with a smaller headline figure. Always convert to carpet area before comparing.
Godrej Bandra Bay’s 4 BHK homes are approx. 2,900–3,500 sq ft* carpet area. See how the rooms could be laid out in our Godrej Bandra Reclamation floor plan and size guide, and compare with other options in our guide to 4 BHK flats in Bandra West.
What Carpet Area Means for Price
Godrej Bandra Bay 4 BHK homes start from ₹29 Cr* (base price). The official price list and unit-wise carpet areas are not yet published, so wait for them before working out a price per sq ft. Stamp duty, registration and GST are added on top – see our guide to the total cost of a ₹29 Cr* home. For how prices are set in this micro-market, read Bandra Reclamation property prices.
Checklist: Verify the Area Before You Sign
- Carpet area in the agreement for sale matches the MahaRERA filing.
- Balcony, deck and terrace areas are listed separately.
- The floor plan in the agreement matches the unit you chose.
- The agreement explains what happens if the delivered carpet area differs from the agreed area.
- For a resale flat: ask for the carpet area in the original agreement, and measure the rooms.
Where Godrej Bandra Bay Fits In
Godrej Bandra Bay offers 4 BHK homes only, approx. 2,900–3,500 sq ft*, from ₹29 Cr*, in one tower of approx. 26 storeys* at Bandra Reclamation. MahaRERA registration is awaited, so final carpet areas will be confirmed when the project is registered. Follow the latest Godrej Bandra Reclamation update.
Comparing large homes nearby? Buyers also look at Adani Bandra Reclamation, and another summary of this project is on the Godrej Bandra Reclamation property page.
Sources and Official References
- MahaRERA (Maharashtra Real Estate Regulatory Authority): carpet areas filed for each registered project.
- The Real Estate (Regulation and Development) Act, 2016 – Section 2(k), definition of carpet area.
- IGR Maharashtra – stamp duty and registration: search registered documents to check the area in an earlier agreement.
We link to official sources for rules. Rates and rules can change – check the current position before you pay.
Carpet Area Explained: Key Takeaways
- Carpet area = usable floor area inside the home; it is the number RERA uses.
- Built-up adds walls; super built-up adds a share of common areas.
- Balconies and terraces are not part of RERA carpet area.
- Compare homes by price per sq ft of carpet area.
- Godrej Bandra Bay 4 BHK: approx. 2,900–3,500 sq ft* carpet area, from ₹29 Cr*.
For every project detail in one place, start at the Godrej Bandra Bay home page, read the complete Godrej Bandra Reclamation guide or visit the Godrej Bandra Reclamation project page.
Want exact unit sizes when they are released? Send an enquiry for verified details on Godrej Bandra Bay.
Frequently Asked Questions
What is carpet area under RERA?
Under RERA, carpet area is the net usable floor area of an apartment. It excludes the area covered by external walls, service shafts, exclusive balcony or verandah and exclusive open terrace, but includes the area covered by internal partition walls of the apartment.
What is the difference between carpet area, built-up area and super built-up area?
Carpet area is the usable floor area inside the home. Built-up area adds the thickness of walls and, often, balconies. Super built-up area adds a share of common areas such as lobbies, lifts, staircases and amenities. Under RERA, homes must be sold on carpet area.
Is a balcony included in RERA carpet area?
No. An exclusive balcony, verandah or open terrace is not part of RERA carpet area. It should be shown separately in the agreement for sale.
What is the carpet area of Godrej Bandra Bay 4 BHK homes?
Godrej Bandra Bay offers 4 BHK homes of approx. 2,900–3,500 sq ft carpet area (indicative). Final carpet areas will be confirmed in the MahaRERA registration and the agreement for sale.
What is the loading factor?
Loading is the difference between the super built-up area and the carpet area, usually shown as a percentage. It reflects common areas and walls. Since RERA requires sale on carpet area, compare projects by price per sq ft of carpet area, not super built-up area.
How do I check the carpet area of a flat?
Read the carpet area stated in the agreement for sale and in the project details on MahaRERA. For a ready flat, you can also measure the rooms. RERA lets buyers seek remedies if the delivered carpet area is less than agreed beyond the allowed limit set in the agreement.
*Prices, sizes and other details are indicative and subject to change. Please verify all details with the developer and on the MahaRERA website before making any decision.
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