1. The amount of floor area in a building or room that is actually available for use, excluding walls, structural elements, and unusable areas
The apartment has 100 square meters of useful floor space.
O apartamento tem 100 metros quadrados de área útil de piso.
2. In real estate, the net floor area that can be occupied or utilized for living, working, or storage purposes
When comparing properties, always consider the useful floor space rather than the total building size.
Ao comparar propriedades, sempre considere a área útil de piso em vez do tamanho total do edifício.