Built-up square foot (BUA) refers to the total area of a property, including both the carpet area (usable space inside the walls) and additional spaces such as walls, balconies, terraces, and sometimes even corridors or utility areas. It is typically 10-25% larger than the carpet area.
Formula:
Breakdown of Different Areas:
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Carpet Area – The actual usable area inside the house.
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Wall Thickness – Includes internal and external walls.
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Balcony & Terrace – Typically included in built-up area calculations.
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Utility Areas – Sometimes included, depending on the builder.
Comparison with Other Measurements:
| Area Type | Description |
|---|---|
| Carpet Area | The actual usable area inside the walls. |
| Built-up Area | Carpet area + walls + balcony/terrace. |
| Super Built-up Area | Built-up area + proportionate share of common areas (e.g., lobbies, lifts, staircases, clubhouses). |
If you’re buying or renting a property, always clarify whether the quoted price is based on carpet, built-up, or super built-up area, as it affects the actual usable space you get.