Four have separate toilets for boys and girls. But for the 39 girls in Year 5, there is no choice but to dash across to another block when they need the toilet.
Headteacher Jean Pilkington said: "The tragedy of it is that in the 21st century we have all these wonderful things like laptops, but can't provide decent basic facilities."
Most of the children in the two-form entry school are educated within the main building, which has eight classrooms.
The school's 1998 Office for Standards in Education report describes the buildings as "barely adequate".
It said: "The school has a number of external classrooms, which are temporary constructions and are drab in appearance. Some classrooms are very cramped."
Inspectors praised the staff for their displays that greatly enhanced the rooms and said the conditions did not have an negative impact on attainment.