The BSP provides education for primary aged children, aged 3-11 years, on two campuses. The Junior School in Bougival provides education from Reception up to and including Year 6. The Junior School in Croissy-sur-Seine is located on the same site as the Senior School, with classes for children in Years 3 - 6. A Nursery class for children aged 3 years is located on the Croissy site.

The BSP will open a new purpose-built Junior School in Croissy in 2010, providing quality education for children aged from 3 to 11 years.