A major increase in demand for primary school places is set to put pressure on local authorities in the Anglia region over the next few years.
By 2015, Costessey, near Norwich, will have at least 75% more children than there are places currently available.
According to figures from the Local Government Association, by September 2016, Central Bedfordshire will need to find 25% more places while in Peterborough pupil numbers will increase by at least 20%.
Schools are already having to convert spaces such as music rooms and libraries into classrooms.
Others have been forced to reduce playground space or expand class sizes, the LGA warned.
David Simmonds, chairman of the LGA's children and young people board, said councils were facing "unprecedented pressures" on school places.
Two people have been arrested after a man was found with serious injuries in Costessey near Norwich.
Police were called to East Hills Road at 4.30am this morning after reports of a fight.
A man in his 60s was found with serious but non life-threatening head and arm injuries.
He's in a stable condition at the Norfolk and Norwich University Hospital.
Two men, aged 42 and 16, are in custody on suspicion of assault. All the people involved knew each other and police are not looking for anyone else.
The emergency services are currently at the scene of a multi-vehicle collision in Costessey, Norwich.
Four cars were involved in the collision on the A1074 Dereham Road at around 2.30pm this afternoon.
Paramedics are treating people for minor injuries.
The road remains blocked in both directions between the turn-off for the A47 and Bawburgh Lane. Police are directing traffic.