📐 Planning & Design📍 Kolkata, West Bengal
What is the difference between carpet area, built-up area and super built-up area? in Kolkata
🤖 AI Answer by Biddaro⏱ 3 min read📅 Updated November 2024
📍 Kolkata Construction Costs (2024)
₹1,500
Basic/sqft
₹2,000
Standard/sqft
₹3,200
Premium/sqft
🧱 Cement: ₹380/bag⚙️ Steel: ₹68/kg👷 Mason: ₹720/day
⚡ Quick Answer
Carpet area is the actual usable floor space inside an apartment. Built-up area includes carpet area plus wall thickness (~10–15% extra). Super built-up area includes common areas like lobby, lift, staircase shared proportionally (~25–30% extra). Under RERA, all transactions must be based on carpet area.
Area Definitions with Example
| Area Type | What's Included | Typical Addition | Example (2 BHK) |
|---|---|---|---|
| Carpet Area | Usable rooms + bathrooms + balcony (RERA definition) | Base | 650 sqft |
| Built-Up Area | Carpet area + wall thickness + duct shafts | ~10–15% extra | 720–750 sqft |
| Super Built-Up Area | Built-up + proportional share of lobby, lift, staircase, gym, etc. | ~25–35% extra | 850–950 sqft |
Key RERA Rule
Post-RERA (2016), all property sales MUST quote price on carpet area. Always ask the developer for RERA carpet area, not super built-up area, when comparing flats.
📍 Kolkata-Specific Tips for This Topic
💡
Kolkata's soft alluvial soil requires pile foundation for G+2 and above — adds ₹5-8L to foundation cost
💡
Very high humidity means external walls need anti-fungal, moisture-resistant paint every 3-4 years
Related topics:
carpet areabuilt-up areasuper built-upRERAKolkataWest Bengal