An over-subscribed East Sussex primary school is likely to be doubled in size to ease pressure on places following an increase in the birth rate.
The Haven, in Atlantic Drive, Eastbourne, would move from one form entry to two, doubling the number of pupils from 210 to 420 by 2016/17.
East Sussex County Council said the town's birth rate had risen by 21% in the past few years.
A formal consultation on the plans is to take place.
A final decision will be taken early next year, with building work on the site beginning during the 2011/12 academic year if it is decided it will go ahead.
The plans for the school, in the Sovereign growth area of Eastbourne, follow a study of school sites across the town to find suitable locations for new buildings.
Plans to build a new primary school have been put on ice because of uncertainty about future pupil numbers.
"At this stage our analysis shows the expansion of a school in the area of highest demand is going to be the best option," said Councillor David Elkin, of East Sussex County Council.
"This will enable us to meet the need short term and also review our longer term pupil forecasts before we make any more substantial commitments.
"This is, though, just part of the solution and we are looking at further opportunities to provide additional school places in the town in the future."