Is it permissible to install surveillance cameras on every floor of a building, given that there are sufficient cameras at the entrance, and that these cameras might violate the sanctity of apartments and expose women, with the possibility of accessing them online at any time?

If there is a need to install surveillance cameras on every floor due to the prevalence of thefts among residents, there is no harm in doing so, provided that women adhere to the legal dress code when going out. However, if there is no such need and residents are harmed by their installation, then it should not be done; this is due to the emphasis in Islamic law on preserving the sanctity of the neighbor and maintaining good neighborly relations.