Carpet Area vs. Super Built-up Area: What Every Homebuyer Must Know
- RERA Carpet Area includes the net usable floor area bounded by internal walls.
- Balconies, terraces, and external walls are calculated separately under RERA rules.
- Super built-up area adds proportional common areas like lobbies, lifts, and staircases.
- Always compute the effective price per square foot on RERA Carpet Area for true comparison.
1. The Official Definition of RERA Carpet Area
Under Section 2(k) of the Real Estate (Regulation and Development) Act, 2016 (RERA), 'Carpet Area' is defined as the net usable floor area of an apartment, excluding the area covered by external walls, areas under services shafts, exclusive balcony or verandah area, and exclusive open terrace area.
However, it explicitly includes the area covered by internal partition walls of the apartment. Before RERA, developers used ambiguous formulas for super built-up area that often loaded 35% to 45% of invisible common space onto the buyer's cost sheet.
2. Breaking Down the Area Hierarchy
To avoid confusion during your property evaluation, remember this hierarchy of floor space measurement:
| Measurement Term | What It Includes | Where It Is Used |
|---|---|---|
| RERA Carpet Area | Internal usable floor space + internal partition walls | Mandatory legal sale agreement baseline |
| Exclusive Balcony Area | Usable area of balconies attached directly to the unit | Separately disclosed under RERA guidelines |
| Built-up Area | Carpet area + balcony area + thickness of external walls | Used in structural and municipal approvals |
| Super Built-up Area | Built-up area + proportionate share of common lobbies, lifts, stairs | Traditional developer marketing metric |
3. How Efficiency Ratio Impacts Your Total Cost
The efficiency ratio is calculated by dividing the RERA Carpet Area by the Super Built-up Area. In well-planned low-density developments, efficiency ratios hover between 70% and 75%. Beware of projects claiming low headline per-square-foot rates if their loading factor exceeds 35%, as you will pay for non-usable corridor space.
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Frequently Asked Questions on this Topic
Are balconies included in RERA carpet area?
No. RERA mandates that balcony area and private terrace area must be declared separately from internal carpet area in all allotment letters and agreements.
How can I verify the exact carpet area of a flat?
Check the approved sanction drawings and the UP-RERA registered project dossier, which lists exact carpet dimensions in square meters for every unit type.
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