Understanding Carpet Area, Built-Up Area & Super Built-Up Area
When purchasing an apartment or commercial property, real estate developers quote prices based on Super Built-Up Area, but the actual usable living space is the Carpet Area. Understanding how these measurements differ prevents overpaying for shared amenities.
1. RERA Carpet Area (Net Usable Area)
Under real estate regulatory acts (such as RERA), carpet area is defined as the net usable floor area of an apartment, excluding external walls, service shafts, and common balconies, but including internal partition walls. Think of it as the area that can literally be covered by a carpet.
2. Built-Up Area (Plinth Area)
Built-up area includes the carpet area plus the thickness of inner and outer perimeter walls, exclusive utility ducts, and private balconies or verandahs. It is typically 10% to 15% larger than carpet area.
3. Super Built-Up Area (Saleable Area)
Super built-up area is the total area for which buyers are billed. It encompasses the built-up area plus a proportionate share of all common building facilities, including:
- Elevator shafts and lift lobbies
- Main entrance corridors and staircases
- Clubhouse, gymnasium, and indoor recreation halls
- Security kiosks and generator rooms
What is Loading Factor?
Loading Factor represents the percentage of common area added on top of the carpet area to derive the super built-up area:
In standard high-rise residential towers, a loading factor between 25% and 32% is considered standard. Anything above 35% indicates high common area allocation.
Frequently Asked Questions
How do I calculate true cost per square foot?
Divide the total property agreement value by the actual RERA carpet area. If a 1,150 sq ft flat at $120/sq ft ($138,000) has an 885 sq ft carpet area, your true usable rate is $138,000 / 885 = $155.93 / sq ft.
Are balconies included in RERA carpet area?
Under standard RERA guidelines, exclusive open balconies and terraces are excluded from carpet area calculations and must be listed as separate line items in sales agreements.
How do I convert square feet to square meters?
Multiply square feet by 0.092903 to get square meters, or divide square meters by 0.092903 (multiply by 10.7639) to get square feet.
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