Carpet Area vs Super Built-Up Area
What You're Actually Paying For

Understanding the Three Area Types

When you look at any apartment listing in Hyderabad, you'll encounter three different area measurements. Each one includes progressively more space — and understanding the difference can save you from paying lakhs more than you should.

1. Carpet Area (What You Actually Use)

Carpet area is the net usable floor area inside your apartment — the space where you can literally lay a carpet. It includes:

• All rooms (bedrooms, living room, kitchen, bathrooms)
• Built-in wardrobes and storage spaces
• Internal partition walls

Does NOT include: Balconies, verandas, external walls, utility ducts, or common areas.

2. Built-Up Area (Carpet + Walls)

Built-up area = Carpet area + thickness of internal and external walls + balcony area. This is typically 10-15% more than carpet area.

3. Super Built-Up Area (The Inflated Number)

Super built-up area = Built-up area + your proportionate share of all common areas. This includes:

• Lobbies, corridors, and staircases
• Lift shafts and machine rooms
• Clubhouse, gym, and swimming pool areas
• Security cabin and maintenance rooms
• Sometimes even the garden and parking areas

The super built-up area is typically 25-40% more than carpet area, depending on how generously the developer defines "common areas."

Real Example: The Numbers That Matter

Let's say a flat is advertised as 1,800 sq. ft. (super built-up) at ₹6,500/sq. ft.:

• Super Built-Up Area: 1,800 sq. ft.
• Built-Up Area: ~1,450 sq. ft. (loading factor ~20%)
• Carpet Area: ~1,200 sq. ft. (loading factor ~33%)

Price comparison:

• Advertised rate: ₹6,500/sq. ft. on SBU = Total ₹1.17 Crore
• Effective rate on carpet area: ₹1.17 Cr ÷ 1,200 = ₹9,750/sq. ft.

That's a 50% higher effective rate than what the brochure suggests! This is why comparing on carpet area is essential.

What Does RERA Say?

Under RERA, all developers must:

• Quote prices based on carpet area only
• Clearly mention carpet area in all agreements and advertisements
• Define carpet area as per the RERA Act definition (net usable floor area excluding external walls, balconies, and common areas)

Despite this mandate, many listings still advertise SBU prominently. Always ask: "What is the RERA carpet area for this unit?"

How to Calculate & Compare

Simple formula to estimate carpet area from SBU:

• For premium projects (more amenities): Carpet ≈ SBU × 0.65
• For mid-segment projects: Carpet ≈ SBU × 0.70
• For basic projects (fewer common areas): Carpet ≈ SBU × 0.75

Pro Tips:

• Always ask for the floor plan with dimensions — measure and verify
• Compare 2-3 properties using carpet area and effective price per sq. ft.
• Check the loading factor (SBU ÷ Carpet Area) — anything above 1.4 means high common area charges
• Get the carpet area mentioned explicitly in your agreement of sale