Ds1 just started school and there are 35 per class (one class entry). There is a teacher and a teaching assistant for each class.
The other school nearby only has 30 single class entry each year, but only one teacher per class, no teaching assistant.
When I asked the heads why this was, I was told 30 is the upper limit, more than that and they need a teaching assistant.
So I went for the school with 2 adults per 35 children rather than 1 adult for 30.
You might have seen some emtpy classrooms but would there have been enough for an extra class for all the years in the school? Would that be over 200 extra children by the time they've moved up all the years?
Would the canteen/playground/toilets etc be able to cope with the extra numbers?
Entry isn't just based on numbers of class rooms.
Have you been refused a place at the school? If so why were you looking round it? Or if you haven't applied yet, then wait and see who gets in, unless you live too far away and know it, and want them to add an extra class to the possible detriment of other schools nearby.
In fact thats an idea, lets just make all the popular schools into 10 class entry...