What is the legal definition of Carpet Area under RERA?

Under Section 2(k) of the Real Estate (Regulation and Development) Act (RERA), 2016, 'Carpet Area' means the net usable floor area of an apartment, excluding the area covered by the external walls, areas under services shafts, exclusive balcony or verandah area and exclusive open terrace area, but includes the area covered by the internal partition walls of the apartment.

What is the difference between Carpet Area, Built-up Area, and Super Built-up Area?

Carpet Area is the actual space enclosed within internal walls where a carpet can be laid. Built-up Area (Plinth Area) equals Carpet Area plus the thickness of internal and external walls plus exclusive balconies/utility ducts. Super Built-up Area (Saleable Area) equals Built-up Area plus your proportionate share of common areas like corridors, lift lobbies, staircases, and clubhouse.

What is considered a fair or normal loading percentage?

In modern Indian real estate, a loading factor between 15% and 25% is considered very good and efficient (typical for low-rise and standalone buildings). For high-rise residential towers with multiple lifts and extensive amenities, 25% to 33% is standard. Any loading above 35% indicates you are paying significantly for phantom common areas.

Carpet Area, Built-Up & RERA Loading Calculator

Q: How is the Loading Percentage calculated in Indian real estate?

Loading is calculated as: Loading % = [(Super Built-Up Area - Carpet Area) / Carpet Area] × 100. For example, if an apartment has a 1,000 sq ft carpet area and a 1,300 sq ft super built-up area, the loading is [(1300 - 1000) / 1000] × 100 = 30%.

Measure room dimensions in feet & inches to compute legal RERA Carpet Area. Unmask builder loading factor percentage, calculate built-up area, and uncover the real cost per usable square foot.

Room Dimensions (Usable Internal Space)

Feet & Inches

Room Name Length Width Area

External Walls & Shaft Allowance Usually 10% to 12%

% of Carpet

Builder Common Area Loading Factor Lobbies, lifts, stairs

% Loading

Net Usable RERA Carpet Area

1,050 sq ft

97.55 m² (116.7 Gaj / Sq Yards)

Built-Up Area: 1,155 sq ft Super Built-Up: 1,478 sq ft Loading: 28%

Floor Area Allocation Carpet: 71% | Walls: 7% | Common: 22%

■ Usable Carpet ■ Outer Walls ■ Lobbies / Lifts / Stairs

True Cost per Usable Square Foot

Advertised Base Rate	₹7,500 / sq ft
Total Property Flat Cost	₹1,10,85,000 (₹1.11 Cr)
True Cost per Usable Carpet Sq Ft	₹10,557 / sq ft
Cost Paid for Common / Phantom Space	₹32,10,000

Equivalent Regional Land & Area Units

Square Yards / Gaj

116.7 Gaj

Delhi / Punjab (1 Gaj = 9 sq ft)

Square Meters

97.55 m²

1 m² = 10.764 sq ft

Ankanam

14.6 Ank

AP / Telangana (1 Ank = 72 sq ft)

Cent / Guntha

2.41 Cent

1 Cent = 435.6 sq ft | 1 Guntha = 1089 sq ft

Understanding Indian Real Estate: Carpet Area, Built-Up & RERA Rules

Before the enactment of the Real Estate (Regulation and Development) Act (RERA), 2016, Indian builders routinely charged buyers based on arbitrary "Super Built-Up Areas" with loading factors as high as 40% to 50%. RERA fundamentally overhauled consumer rights by mandating that properties be quoted and sold strictly on the basis of Net Usable Carpet Area.

1. The Three Layers of Apartment Area Explained

Carpet Area (RERA Carpet): The net floor area inside the apartment where you can literally lay down a carpet. Under RERA Section 2(k), it includes all rooms (living, bed, kitchen, bathrooms) and internal partition walls. It strictly excludes external walls, common areas, and exclusive balconies.
Built-Up Area (Plinth Area): Carpet area plus the thickness of outer perimeter walls and the area of private balconies, verandas, and utility wash areas. Typically 10% to 15% greater than carpet area.
Super Built-Up Area (Saleable Area): Built-up area plus your proportionate share of all common building infrastructure (staircases, lift shafts, entrance lobbies, generator rooms, and security offices).

2. How to Detect Builder "Loading"

Loading is the percentage surcharge added over the carpet area to cover shared construction. The formula is:

Loading % = [(Super Built-Up Area − Carpet Area) ÷ Carpet Area] × 100

For example, if an apartment has a 1,000 sq ft carpet area and a 1,300 sq ft super built-up area, the loading is $[(1300 - 1000) / 1000] \times 100 = \mathbf{30\%}$.

3. The True Cost Trap

A builder may advertise an enticing rate of ₹7,500/sq ft on a 1,500 sq ft super built-up flat (Total price = ₹1.125 Crore). But if the actual usable carpet area is only 1,050 sq ft, your true effective rate is ₹10,714 per usable square foot. Always calculate the true carpet cost before comparing competing real estate projects.