Carpet Area vs. Built-Up Area vs. Super Built-Up Area (RERA Guide & Formulas)
Explaining space calculations to homebuyers is a essential skill for real estate sales executives in India. Under the Real Estate (Regulation and Development) Act (RERA), builders are legally mandated to sell properties strictly on the basis of RERA Carpet Area rather than vague super built-up claims.
Definition & Difference Table
| Area Type | What It Includes | What It Excludes |
|---|---|---|
| RERA Carpet Area | Net usable floor area inside flat + internal partition walls. | External walls, balcony, terrace, utility duct, lift lobby. |
| Built-Up Area | Carpet area + thickness of external walls + exclusive balcony / terrace. | Common corridors, staircase, elevator shaft, clubhouse. |
| Super Built-Up Area | Built-up area + proportionate share of common areas (corridors, lobby, stairs, amenities). | Open playground / garden area. |
Calculation Formula & Numerical Example
Loading Percentage Formula:
Loading % = ((Super Built-Up Area - Carpet Area) / Carpet Area) * 100
Example Calculation:
- Carpet Area = 1,000 sq.ft
- Super Built-Up Area = 1,350 sq.ft
- Loading % = ((1350 - 1000) / 1000) * 100 = 35% Loading
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