When a school cannot find a substitute teacher, the problem rarely stays contained to one classroom. The absence has to be managed somehow, and the fallback options often create pressure across the wider school.
The fallback has a cost
A school may need to split pupils across other classes, ask another teacher to supervise, redeploy a Special Education Teacher, or make difficult decisions under time pressure.
These choices are often necessary in the moment, but they carry a hidden cost.
Split classes disrupt more than one room
According to the INTO / IPPN / CPSMA Teacher Supply Survey, 215 schools had split classes to cover for absent colleagues, resulting in 735 days of disruption to children's learning in the first six weeks of the school year.
Split classes affect the absent teacher's pupils, but they also affect the receiving classes. Teachers may suddenly have extra pupils, a wider range of needs, less space, and more supervision pressure. Even when managed well, it can interrupt the normal flow of teaching and learning.
SET redeployment adds another pressure point
The impact becomes even more serious when special education support is affected. The same survey found that 65% of schools had redeployed a Special Education Teacher to cover the absence of a class teacher. It also noted that children with special educational needs are disproportionately affected by teacher shortages.
This matters because special education support is not spare capacity. It is targeted provision for children who need it. When SET time is repeatedly used to cover mainstream absences, the school may solve an immediate supervision problem while creating another problem elsewhere.
Some schools feel the pressure more sharply
The INTO / IPPN / CPSMA data also shows that the issue is not evenly spread. Special schools, Gaelscoileanna and DEIS schools reported higher levels of vacancies than mainstream schools.
According to the survey, special schools had the highest percentage of reported vacancies at 56%, while 43% of Gaelscoileanna, 35% of DEIS Band 2 schools and 32% of DEIS Band 1 schools reported long-term vacancies.
Better planning reduces avoidable disruption
Technology alone cannot remove the national teacher supply challenge. But better substitute planning can reduce avoidable disruption.
A school with live visibility of substitute teacher availability is in a stronger position than one relying only on old contact lists. A school that can prioritise preferred teachers and send requests quickly is less likely to lose time. A school that can keep accurate records of substitute bookings can identify patterns, plan ahead, and reduce repeated manual work.
From reactive chasing to structured management
Subber helps schools move from reactive cover chasing to structured substitute management. Instead of starting from scratch each morning, schools can build a clearer picture of who is available, who is suitable, and who has already confirmed.
Every school will still face unexpected absences. The goal is not to eliminate uncertainty completely. The goal is to reduce the amount of time, stress and disruption created by that uncertainty.
