At primary level, classroom teachers are allocated to schools at a general average of 1 classroom teacher for every 23 pupils. In DEIS Band 1 schools, teachers are allocated at a lower ratio, at an average of 17:1, 21:1 and 19:1 for junior, senior and vertical schools respectively. Each one point reduction in the staffing schedule at primary level for DEIS and non-DEIS schools requires between 350 and 400 additional teaching posts, at an approximate cost of between €9.3 and €10.7 million in the first year, and €28 to €32 million per annum thereafter. At post-primary level, a reduction in the pupil teacher ratio from 19:1 to 18:1 would create an additional c. 1175 posts at an estimated cost of €32 million in the first year and €96 million per annum thereafter. Salary costings will rise in line with pay agreements.
The estimated one-off capital cost of reducing the pupil teacher ratio by one point at primary level is circa €25 to €35 million, while at post-primary level, it is circa €60 to €75 million. This estimated cost is based on certain assumptions regarding the number of new teaching posts generated and available accommodation capacity.