🧱 What Is Built-up Area?

Built-up Area = Carpet Area + External walls + Balcony + Utility areas

It covers your private unit’s entire built structure, including outer walls and private additions.

👉 Usually, this is 10–20% more than carpet area.

📍Example Continued:
Carpet Area = 600 sq.ft + walls + balcony = 120 sq.ft
➡ Built-up Area = 720 sq.ft

🏢 What Is Super Built-up Area?

Super Built-up = Built-up + Share of common areas like lift, lobby, staircase, and even clubhouse or stilt parking.

⚠ This number is not regulated by RERA and varies between builders.

📍Example:
Built-up Area = 720 sq.ft + Common Area = 180 sq.ft
➡ Super Built-up Area = 900 sq.ft

📐 What Is RERA Carpet Area?

Under RERA, carpet area is clearly defined to exclude balconies and external walls, but include internal walls.

✅ Builders must mention RERA Carpet Area in all agreements.

🧱 What Is Plinth Area?

Plinth Area = Total built-up footprint of your flat measured from the outer wall to outer wall — used mostly for plan approvals and DTCP/CMDA clearance.

It includes walls, ducts, and structural space but excludes shared areas and parking.

🌍 What Is UDS – Undivided Share of Land?

UDS refers to your share in the total land that your apartment building stands on. Higher UDS = more ownership and better resale/development rights.

📌 How it’s calculated:
UDS = (Your flat’s built-up area / Total built-up area of all flats) × Total land area

📍Example:
6 flats of 800 sq.ft on 4800 sq.ft land
➡ Each flat’s UDS = 800 sq.ft

📊 Quick Comparison Table

🧮 Bonus: Stamp Duty Implications

Builders often charge based on super built-up area, but stamp duty and registration apply to carpet or built-up area.

📢 What Smart Buyers Always Ask:

• ✅ What is the RERA Carpet Area?
• ✅ What is the Super Built-up Area and Loading %?
• ✅ How much UDS will I own?
• ✅ Is the project CMDA/DTCP approved?
• ✅ Does the plinth area match approved plans?

Verified Real Estate at your service:

Before buying use these services provided by Verified Real Estate for a hassle free transaction.

Use Due Diligence to cross-verify the actual carpet area before signing any agreement.

To estimate cost based for constructing in the given carpet area try the Building Value Calculator for tiles, roof construction.

Always compare price per carpet area to avoid misleading deals. The Property Valuation tool can help you benchmark against similar listings.

Using Legal Opinion ensures you’re not misled by inflated super built-up area figures.

Estimate your total cost of purchasing a property  which will include the registration and stamp duty fees as well by using the Stamp Duty & Registration Calculator

Low UDS (e.g., 200–300 sq.ft for a 2BHK) can hurt future value. Confirm land records with services from Verified.realestate before buying.

Understanding RERA: A Comprehensive Guide for Homebuyers in Tamil Nadu

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What is RERA?

RERA was established to protect homebuyers and encourage investments in the real estate sector by creating a more transparent and fair system. The act requires all real estate projects to be registered with the Real Estate Regulatory Authority before they can be marketed or sold. This registration aims to provide transparency in project details and ensure timely delivery.

Key Provisions of RERA

Carpet Area Definition: Under RERA, carpet area is defined as the net usable floor area of an apartment, excluding the area covered by external walls, service shafts, exclusive balcony or verandah areas, and exclusive open terrace areas. It includes the area covered by internal partition walls of the apartment. This standardization ensures buyers understand the exact usable space they are purchasing.

Transparent Pricing: RERA mandates that developers must charge buyers based on the carpet area, not the super built-up area. This provision ensures that buyers are not misled by inflated figures that include common areas, bringing fairness to the pricing of residential properties.

Project Registration and Details: All real estate projects must be registered with the state’s Real Estate Regulatory Authority. This registration includes providing detailed information about the project, such as layout plans, timelines, and approvals, helping buyers make informed decisions.

Regulation of Agents: Real estate agents must also register under RERA. This regulation helps monitor their activities and ensures they adhere to ethical practices in property transactions.

Timely Delivery and Compensation: RERA includes provisions for the timely delivery of projects. If there are delays, developers are required to compensate buyers. This provision aims to reduce project delays and ensure buyers get possession of their homes as promised.

Builders’ Practice of Charging Based on Super Built-Up Area

Despite RERA’s emphasis on carpet area, many builders continue to charge based on the super built-up area, which includes the carpet area plus a proportionate share of common areas like lobbies, staircases, and amenities. Here’s why this practice persists:

1. Inclusion of Common Areas: The super built-up area accounts for shared spaces that all residents use. By charging for these areas, builders recover the cost of constructing and maintaining these communal facilities.
2. Higher Revenue: Charging based on super built-up area typically results in higher overall pricing, which increases revenue for builders. This practice, although not aligned with RERA’s principles, is still prevalent.
3. Industry Norm: The real estate industry has long followed the practice of selling properties based on the super built-up area. This norm continues despite RERA’s regulations.
4. Buyer Perception: Some buyers perceive more value in having access to extensive amenities and well-maintained common areas, making them more willing to pay for the super built-up area.

Ensuring Transparency and Fairness

RERA aims to address these issues by making it mandatory for builders to clearly state the carpet area and ensure that buyers are aware of what they are actually paying for. This transparency is crucial in promoting fair real estate transactions. Buyers should always ensure that they receive clear details from developers regarding the areas included in their property’s measurement.

Conclusion

RERA has brought significant changes to the real estate sector in Tamil Nadu, ensuring that homebuyers are protected and well-informed. By standardizing terms like carpet area and mandating transparency in pricing and project details, RERA helps buyers make better decisions. While the practice of charging based on super built-up area persists, understanding the provisions of RERA can empower buyers to demand fairness and transparency in their real estate transactions. As the real estate market continues to evolve, RERA will play a crucial role in shaping a more transparent and accountable industry, ultimately benefiting homebuyers and promoting a healthy real estate market in Tamil Nadu.