The question people will not ask out loud, and will not join without

Describe the room, concretely, as if the reader is anxious

Individual cubicles or an open bench. Showers with doors or curtains. Lockers inside the wet area or outside. Whether the changing room is shared with a swimming pool and therefore with the public. Each of these is a plain fact about a building, each one is the deciding fact for somebody, and almost no club writes any of them down.

This is the enquiry people prefer to put to software

Asking a receptionist whether anyone will see you undressed is a conversation most people will not have, so they do not ask and they do not join. The same question typed into a chat window at night is easy, which makes this one of the few categories where an assistant reaches buyers a human never will. That is an argument for writing the answers, not for hoping nobody asks.

Say when it is quiet, because that is the real accommodation

For many members the answer is not a facility but a time. Mid-morning on a weekday, the last hour before closing, the days that are never busy: a club that publishes its own pattern lets a hesitant member design a visit they can manage. It costs nothing, it fills the hours the club wants filled, and it is information the club already has.

Gendered and family arrangements need stating, not implying

Separate facilities, hours, family changing rooms, what a parent does with a child of the other gender, what provision exists for members who do not fit either room comfortably. These are policy questions a club should settle deliberately and publish plainly, because every one of them is currently being guessed at by someone deciding whether to walk in.