Somehow, despite everyone agreeing it's a problem, double-booking remains one of the most common admin failures in trade businesses.
Double-booking has an odd status in small business life: everyone agrees it's a problem, everyone's had it happen to them, and yet it keeps happening anyway, usually because two different people booked two different jobs into the same slot without either of them being able to see the other's diary.
Why it happens even to careful people
It's rarely carelessness. It's a visibility problem - one person books off the office calendar, another books off a paper diary, a third just "knows" someone's free without checking anything, and none of those three sources agree with each other.
What actually prevents it
A single shared view of who's working when, including time off and blocked periods a manager has set aside - not five separate calendars quietly disagreeing with each other. Team members setting their own availability and time off directly means the diary reflects reality, rather than whatever the last person to update the whiteboard remembered.
The verdict
Double-booking isn't really a scheduling problem. It's a "too many separate diaries" problem, and it only has one real fix.