Minimum sanitary facility numbers specified in NCC 2022 Volume One F4D4 are based on a study commissioned in 2001. At the time, that study was used as a basis for increased provisions of sanitary facilities for females in some public buildings. Nevertheless, unreasonable queuing times for females in single auditorium theatres and cinemas remain evident.

The ABCB received multiple PFCs seeking increased provision of sanitary facilities for females. These were considered by the Building Codes Committee (BCC) and the ABCB investigated the solutions to address the issue for the inclusion in NCC 2025.

The proposed amendments to Table F4D4i in NCC Volume One attempt to rectify the problem of unreasonable queuing times for females. The amendments increase the average ratio of male to female sanitary facilities to have sufficient facilities to serve peak periods in a single auditorium or theatre and cinemas.