1. The floor space in a building or property that can be actively used for its intended purpose, excluding walls, structural elements, and non-functional spaces
The apartment has a useful area of 80 square meters.
O apartamento tem uma área útil de 80 metros quadrados.
2. In real estate, the measurable space available for occupation or use, as opposed to gross area
When calculating rent, the useful area is more important than the total area.
Ao calcular o aluguel, a área útil é mais importante que a área total.