Is it necessary to design two bathrooms in a duplex building?

Of course, it's still good.

The main bathroom and guest bathroom are separated in the room, which is more convenient and private. >>>More

This is determined by the permanent population of the family and one's own regular conditions. >>>More

This mainly depends on the structure of your house, and now the vast majority of the signal coverage of ordinary home routers cannot reach the full coverage of both layers of signals, so it is recommended to use a wireless router on each of the two floors to cover them separately.

Look at the usage and the location of the two bathrooms.

With a lot of usage, one water heater may not be enough. >>>More

1. There can be no bathroom directly below the bedroom on the second floor. Because the water vapor in the bathroom is relatively heavy, if the bedroom on the second floor shares the same wall as the bathroom on the first floor, the floor of the bedroom on the second floor will be wet. Over time, the bedroom will become gloomy, which is not good for the health and mental development of the residents. >>>More