A school principal has described the decision to block the construction of a purpose-built school as "unthinkable".
Blaby District Council refused Countesthorpe Leysland Community College permission to build a new £8m school on the campus of the existing college.
The plans - which were submitted by the Department for Education and Interserve as part of the government’s priority school building programme - included demolishing the Leysland building and putting a new two-storey block on the playing field closest to the existing college base.
Leysland High School and Countesthorpe Community College merged to become one school back in 2016, and since then lessons have been split across the two schools on the Winchester Road campus.
Catherine Aitcheson, the school's principal, said she is "extremely disappointed" by the "worrying" decision, claiming thousands of children will miss out on "vital state-of-the-art facilities".
John Richardson, strategic director at Blaby District Council, said the authority is "committed to working positively with the college to support its future aspirations", but said it has to take into account "the full range of planning considerations, which includes the impact on listed buildings".