Ryelands Primary School and Nursery has remained closed after asbestos was found during maintenance work.
The school was sealed off last Thursday after workmen discovered asbestos while undertaking refurbishment at the Torrisholme Road site during the Easter holidays.
And due to this causing a delay in the building maintenance schedule, the pupils are not able to return to school and nursery until Thursday April 12.
A statement from the school said: “We are really sorry about the inconvenience this will cause but these are exceptional circumstances and the safety of our children and staff is paramount.”
It is understood an electrical firm from Preston had been on the site carrying out wiring and lighting repair work.
Around 20 workmen were in the building when the asbestos discovery was made.
A Lancashire County Council spokesman said at the time: “Asbestos was discovered at the school when maintenance work was being carried out. “As soon as we became aware of the issue we took immediate steps to understand the situation.
“Experts are currently inspecting the premises and will inform us of any and all actions that are necessary.”