https://www.ultratechcement.com/for-homebuilders/home-building-explained-single/descriptive-articles/difference-between-carpet-area-and-built-up-area - Understanding the difference between carpet area and built-up area is essential for anyone buying or constructing a property. The carpet area refers to the actual usable space inside a home where you can lay a carpet excluding the walls, balcony, and common areas.