Is it permissible to build classrooms on the roof of the mosque for women, such that they are outside the mosque?

Question:
May Allah reward you. Honorable Shaykh, this questioner says: We have a charitable institution. Is it permissible to build on the roof of the mosque in the institution? We want to build classrooms for women there, so that they are not part of the mosque at that time?

Answer:
The women should have a special place in a house or a private room, and they do not study in the mosque. The mosque is for men, and men enter it. So the women are given a separate, enclosed, roofed place.