Are non Muslims allowed to build, repair or worship places such has Churches, Temples & Synagogues in Muslim occupied lands if they are living under Muslims as dhimmis or have a peace treaty with them?!
Sure it is permissible. When Islam accords acceptance to the practice of faith of its non-Muslim citizens then it is obviously rational to allow them to build their prayer houses and upkeep of them. Under Muslim rule, their protection would be the responsibility of the Muslim government. Prophet, in war situations, has categorically ordered not to destroy the worshipping places of non-Muslims, not to kill or harm their religious (non-Combatant) men.