What is Carpet Area? RERA Definition, Calculation & Complete Guide
📅 Updated June 2026
⏱ 8 min read
✅ Fact-checked
📖 Quick Definition
Carpet Area is the actual usable floor space inside your apartment — the area where you can literally lay a carpet. Under RERA 2016, all property pricing must be based exclusively on carpet area, making it the most important measurement in Indian real estate.
Defined under: RERA Section 2(k) | Includes: Internal walls, usable floor space | Excludes: External walls, common areas, balcony
⚡ At a Glance
RERA Definition
Net usable floor area of apartment, including internal partition wall area
Includes
All rooms, kitchen, bathrooms, internal walls, utility areas
Excludes
External walls, balconies, terraces, common areas, lift shafts
Pricing Standard
RERA mandates all sales pricing be based on carpet area only
vs Built-Up Area
Carpet area + external walls = Built-up area (5–10% more)
vs Super Built-Up
Carpet area is typically 65–75% of super built-up area
Mandatory Disclosure
Builder must state carpet area in all RERA filings and sale agreements
What is Carpet Area?
Carpet area is the net usable floor space within the walls of your apartment. It is the area you experience every day — your bedroom, living room, kitchen, bathrooms, and internal passages. The term comes from the literal idea: it is the area on which you can lay a carpet wall to wall inside your home.
Before RERA 2016, most builders priced apartments on super built-up area, which included shared spaces like lobbies, staircases, and lift shafts — areas you never actually use. This inflated the effective price per square foot significantly. RERA put an end to this by mandating carpet-area-only pricing, creating genuine transparency for buyers.
✅
RERA Rule (Section 2(k)): Carpet area means the net usable floor area of an apartment, excluding the area covered by the external walls, areas under services shafts, exclusive open terrace area and exclusive balcony area. Internal partition walls are included in carpet area.
How to Calculate Carpet Area
Carpet Area = Sum of all room areas (measured from inner wall to inner wall)
Space
Included in Carpet Area?
Bedrooms
Yes
Living / Dining Room
Yes
Kitchen
Yes
Bathrooms / Toilets
Yes
Internal walls / partitions
Yes
Internal passages / corridors
Yes
Utility / Store room (inside unit)
Yes
Exclusive Balcony / Terrace
No (separate)
External walls
No
Lobby / Staircase / Lift
No
Common areas
No
Carpet Area vs Built-Up Area vs Super Built-Up Area
These three measurements are used frequently in Indian real estate and are often confused. Here is exactly how they relate:
Measurement
What it Includes
Typical Size
Carpet Area
Usable floor space + internal walls
Base (100%)
Built-Up Area
Carpet area + external walls + exclusive balcony
~110–115% of carpet area
Super Built-Up Area
Built-up area + proportionate share of common areas
~125–140% of carpet area
⚠️
Real-world example: A 1,000 sq ft super built-up apartment typically has only 700–750 sq ft of actual carpet area. If you paid ₹1 crore for 1,000 sq ft SBUA at ₹10,000/sq ft, your effective carpet area cost is ₹13,000–14,000/sq ft. Always ask for and compare carpet area pricing.
What is Loading Factor?
The loading factor is the difference between super built-up area and carpet area, expressed as a percentage. A loading factor of 35% means for every 100 sq ft of carpet area, you are paying for 135 sq ft of super built-up area. Post-RERA, this concept is less relevant for new projects, but understanding it helps when evaluating older or pre-RERA inventory.
How to Verify Carpet Area Before Buying
1
Check the RERA Portal
Every registered project must disclose carpet area for each unit type on the state RERA portal. This is the most reliable source.
2
Compare with Floor Plan
Ask for the floor plan with dimensions. Calculate the area yourself using the room dimensions provided. Cross-check with the RERA disclosure.
3
Verify in Agreement for Sale
The registered Agreement for Sale must state the carpet area. If the builder quotes a different number at possession, you have legal recourse under RERA.
4
Physical Measurement at Possession
At the time of possession, measure the carpet area yourself or hire a licensed surveyor. If it deviates by more than 3% from the agreed area, RERA entitles you to a proportionate price reduction or refund.
As per RERA Section 2(k), carpet area means the net usable floor area of an apartment, excluding the area covered by external walls, areas under services shafts, exclusive open terrace area and exclusive balcony or verandah area. Internal partition wall areas are included in carpet area.
Carpet area is the actual usable space inside your apartment walls. Super built-up area adds your proportionate share of common spaces — lobby, staircase, lift, clubhouse — on top of carpet area. Typically, carpet area is 65–75% of the super built-up area.
Under RERA, if the actual delivered carpet area varies by more than 3% from the agreed amount, the buyer has the right to a proportionate refund with interest, or can choose to exit the project entirely with full refund and interest. Builders cannot make material changes without buyer consent.
No. Under RERA, exclusive balcony and terrace areas are excluded from carpet area. They are typically measured and priced separately. Some builders include a portion of the balcony at a different rate. Always clarify what is included in the price.
There is no fixed formula, as the loading factor varies by project. Typically, carpet area = super built-up area divided by 1.25 to 1.40, depending on the builder's loading factor. The safest approach is to ask the builder directly for the RERA-registered carpet area for your specific unit.
