📏 Difference Between Carpet, Built-up & Super Built-up Area (2026 Homebuyer Guide)

When buying a flat in India, the most confusing terms are Carpet Area, Built-up Area, and Super Built-up Area.
Builders advertise one number, buyers calculate another, and the actual usable space turns out to be something else.

This simple 2026 guide will help you understand these terms clearly—so you know exactly how much space you are paying for.

🟦 1. What Is Carpet Area? (RERA Definition)

Carpet Area = Usable floor area inside your flat
This includes:

• Bedrooms

• Living room

• Kitchen

• Bathrooms

• Internal walls

It does not include:

• Balcony

• Terrace

• Common areas

• External walls

👉 Carpet Area = Actual usable space

This is the most important number for buyers.

🟩 2. What Is Built-up Area?

Built-up area is:

Carpet Area + Wall Thickness + Balcony Area

It includes:

• Carpet area

• Internal & external walls

• Balcony or terrace space

👉 Built-up area is usually 10–20% more than carpet area.

🟧 3. What Is Super Built-up Area? (The Saleable Area)

Super built-up area includes:

Built-up Area + Common Areas

Builders add a portion of:

• Lobby

• Lift area

• Staircases

• Amenities

• Clubhouse spaces

• Corridors

• Security room

👉 This is also called saleable area.

This is the number builders usually advertise to make flats look larger.

It is 30–60% more than carpet area.

📊 4. Simple Example (2026 Standard)

So a “1050 sq ft flat” often has only 650 sq ft usable space.

🏢 5. Why Builders Prefer Super Built-up Area

• Higher saleable area looks attractive

• Increases pricing without increasing actual space

• Common practice across India

But after RERA, carpet area has become the main legal area, making things more transparent.

🔎 6. Always Ask for Two Key Details (2026 Rule)

Before booking, ask the builder:

✔ “What is the RERA Carpet Area?”

✔ “What is the Loading Percentage?”

Loading % = (Super Built-up – Carpet Area) / Carpet Area × 100

Typical loading in 2026:

• Affordable projects: 20–30%

• Mid-segment: 30–45%

• Premium luxury: 45–65%

Higher loading = less usable space.

🧮 7. How to Calculate Price Correctly

Most buyers calculate:

❌ Price × super built-up area

Correct way:

✔ Price per sq ft of carpet area
✔ Price per sq ft of built-up area
✔ Compare the loading %

This helps compare projects properly.

🟢 Conclusion

Understanding these area terms is essential for every buyer.
In 2026, RERA has made pricing more transparent, but many builders still promote super built-up areas.

Always check the RERA carpet area, know the loading percentage, and calculate the price based on actual usable space.

This will help you make smarter and more confident home-buying decisions.