The TUI says that the impact of the accommodation crisis is having a major effect, particularly in situations where teachers are not being offered full hours contracts.
The poll of almost 100 schools was carried out in September and October by the Principal and Deputy Principals' Association of the TUI.
It reveals that 61% of schools have open positions that are vacant as a result of recruitment and retention issues, and 71% of schools advertised opportunities in the last six months for which no teachers applied.
The study identifies availability and lodging expenses as the two biggest obstacles to attracting and keeping teachers.
In 77% of the schools surveyed, a teacher accepted a post only to later turn it down, frequently in favour of another career with a higher number of guaranteed hours.
To address the situation, the TUI is urging that instructors be hired on permanent contracts with full hours from the start.
Additionally, the union demands that middle management positions be quickly restored.
According to TUI President Liz Farrell, "Overall, teacher recruitment and retention issues limit the service to students, who may miss out on subject options or be taught by 'out-of-field' teachers."
In circumstances where instructors have contracts with less than full hours, Ms. Farrell said, "the impact of the accommodation crisis across the country is also having a major influence."
The TUI General Secretary claimed on RTÉ's Morning Ireland that some secondary school teachers are currently beginning off with "three quarters of a job" and are unable to support themselves on that salary.
Michael Gillespie remarked, "Now you can imagine having to survive in a cost of doing crisis on three-quarters of a job with no promotional chance."
"You might remain for one or two years. The retention crisis is here, but there are other places where they'll give you a permanent position where the grass is greener.
Mr. Gillespie claimed that teachers' decision to relocate abroad, particularly in remote locations where there is no housing available, is also influenced by the housing problem.
He claimed that repeating the same actions will only result in worse results.
According to the Department of Education, a thorough programme of work is carried out to assist the supply of teachers at the primary and post-primary levels.
Changes to the registration requirements for student teachers and initiatives to improve the pool of available substitute instructors are examples of measures.
A spokesman added, "The Department of Education will continue to create and execute measures to solve issues faced by schools and to boost the supply of teachers to our schools with the participation of the education partners."
