If a woman prays alongside a man but there is a barrier between them, such as a wall, or a gap which is wide enough for a person to stand and pray there, then the prayer is valid according to the majority of scholars.

It is not permissible for anyone or for any group to pray in the home when the mosque is nearby. But if the mosque is far away, and they cannot hear the Adhan, then there is no sin on them if they pray in a congregation in the house.