Two popular primary schools could be enlarged to cope with the demand for extra places.
A consultation will be held on plans to permanently expand Trinity CE/Methodist Primary School, in Buckshaw Village, and Primrose Hill Primary School, in Euxton.
More places are needed for primary school children due to rising birth rates in the area and the number of new houses being built.
Lancashire County Council’s schools chief Matthew Tomlinson, cabinet member for children, young people and schools, gave the approval for the consultation on Monday.
The proposed expansion would increase the number of reception class places at Primrose Hill from 30 to 60 from 2016 and beyond.
At Trinity, the intake would increase from 60 to 90, which would need the school to expand onto a second site in Buckshaw Village.
County Coun Tomlinson said: “One of our key responsibilities at the county council is making sure that there are enough school places to meet demand.
“Sometimes there’s just a temporary increase in numbers, but in the Euxton area, our projections show that we need to put in some permanent additional school places.
“The reasons for this are a combination of a rising birth rate and housing development in the area.
“I’d encourage local people to let us have their views via the consultation.”
If the expansion is approved, Primrose Hill would be enlarged on its existing site, while Trinity would need to expand into a second building on a site nearby.
Coun Mark Perks, borough councillor for Astley and Buckshaw and county councillor for Chorley North, welcomed the consultation.
But he said it was “long overdue” because of the rising birth rate and number of houses being built in Buckshaw Village.
He said: “It’s very much needed for the north of Chorley because that’s where the house-building is going on.
“I welcome the expansion of both schools.”
The consultation will begin on Monday and run until Friday, February 13.
The consultation documents will be available at both schools, at civic buildings such as community centres and libraries, and online at www.lancashire.gov.uk/schools.
Consultation evenings, for which appointments can be made, will be held on Tuesday, January 27 at Primrose Hill Primary School and Tuesday, February 3 at Trinity CE/Methodist Primary School.
County Coun Tomlinson’s decision to approve the consultation could be called in for reconsideration within three days.