MPs have warned that under-performing schools could be forced to expand to deal with a chronic shortage of places for children.
Local councils may have to make decisions that affect the quality of pupils' education in the rush to provide enough school places, a new report by the Commons Public Accounts Committee (PAC) said.
Buildings such as libraries or music rooms could be turned into classrooms to meet the demand in areas facing a squeeze on places, it added.
The committee is the latest group to raise concerns about a lack of school places.
More top news
The shadow home secretary, 63, said she worked in the Home Office for nearly three years when she was a trainee.
Home Secretary Amber Rudd has attacked Labour's capabilities to effectively deal with any future terrorism threats facing the UK.
Tori Lee Castillo, 39, has been arrested on suspicion of child abuse.