Russell Hobby from the National Association of Head Teachers said the "lack of planning is frustrating" when it comes to school places.
Speaking to Daybreak he said: "You should be able to predict this, when more children are born, four years later you need more school places."
More top news
At least 17 people trapped inside an ammunition depot in India when a fire broke out are feared to have died.
Strong winds and rain, heavy at times in the south-east, are forecast for the UK on Tuesday.
The plan to scrap the VAT could save taxpayers £2 billion if Britain left the EU, lead Leave campaigners claim.