Almost 30 schools face delays of "a number of years" for new buildings or an extension.
The figure was revealed by the Department of Education, which told The Irish News that schemes "in a very early stage of development and where planning has not started have been paused".
It has listed a total of 28 schools across the north that will be impacted.
The vast majority of schools affected are in Co Antrim, including Cambridge House Grammar in Ballymena, Carrickfergus Academy and Larne High School.
Other schools such as St Joseph's College in south Belfast and St Paul's High School in Bessbrook also face delays.
The department confirmed recently that there will be no new school buildings or extensions started in 2023/24 amid escalating cuts to the education budget.
In a letter to school principals, the department warned that “extremely difficult decisions” will have to be made in planning for the year ahead.
Dr Suzanne Kingon, the department's director of investment and infrastructure, said in the letter about funding for capital projects that a further reduced capital budget and rising construction costs would mean demands “far exceed the funding available”.
The Irish News asked the department for a list of the schools impacted by the budget cuts, they are:
Ballyclare High School
Ballyclare Secondary School
Ballymena Academy
Belfast High School
Cambridge House, Ballymena
Carrickfergus Academy
Dean Maguirc College, Carrickmore
Dromore High School
Edmund Rice, Newtownabbey
Friends' School Lisburn
Hunterhouse College, Belfast
Killicomaine Junior High School
Larne Grammar
Larne High School
Lisnagarvey High School, Lisburn
Loreto College, Coleraine
Lumen Christi College, Derry
Malone Integrated College, Belfast
Mercy College, Belfast
Portadown College
Sperrin Integrated College, Magherafelt
St Brigid's College, Derry
St Catherine's College, Armagh
St Ciaran's College, Ballygawley
St Joseph's College, Belfast
St Louise's Comprehensive College, Belfast
St Paul's High School, Bessbrook
St Pius X College, Magherafelt
A Department of Education spokesman said schemes at these schools will "not be ready to proceed to construction for a number of years".
“It is unlikely that the department will have sufficient funding available to proceed any new major capital or school enhancement schemes to construction this year, however, all such projects with appointed consultancy teams are continuing in design and planning.
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"When these projects are fully planned, a decision will be taken on a case-by-case basis whether they will progress to construction dependent on the budget available at that time.
“A number of schemes in a very early stage of development and where planning has not started have been paused, as at present it is not affordable to spend much needed funding on consultancy fees for potential new build projects which will not be ready to proceed to construction for a number of years."
SDLP education spokesperson Daniel McCrossan said the delays to new buildings will have a "significant impact".
“If we want to provide the best educational experience for our young people then we need to provide modern facilities that enable them to reach their full potential," he said.
"These delays cannot result in these vital projects being shelved indefinitely and when the Stormont institutions are restored I will make it a priority to ensure that the new education minister gets plans for these new buildings back on track.”
Sinn Féin MLA Pat Sheehan also said it was "hugely disappointing" that the school builds had been paused.
"This is a huge blow to our children, school staff and communities who greatly benefit from having first-class education facilities," he said.
