Built-up Area
Carpet area plus the thickness of outer walls and the balcony, also known as the plinth area.
Built-up Area (also called Plinth Area) is carpet area plus the area occupied by walls. This includes:
Components of Built-up Area
- Carpet area (usable floor space)
- Area covered by internal walls
- Area covered by external walls (typically calculated as 50% of external wall thickness)
- Balconies and terraces (exclusive to the unit)
Built-up Area Formula: Built-up Area = Carpet Area + Wall Area + Balcony Area
Typically, built-up area is 10-15% more than carpet area.
Why it matters: Built-up area gives you a better sense of the total space your apartment occupies, including structural elements. However, for pricing purposes, carpet area (post-RERA) is the standard as it represents actual usable space.
Note: Different developers may calculate built-up area slightly differently, especially regarding how much of external walls and balconies to include. Always clarify the methodology used.
Examples
If carpet area is 1000 sq ft, built-up area is typically 1100-1150 sq ft
A 20 sq ft balcony adds to built-up area but not carpet area