Every autumn, thousands of families arriving for postings at the EU institutions, NATO and multinational headquarters begin the same process: international school admissions in Brussels. The Belgian capital has one of the densest concentrations of international schools in Europe, yet the best-known names still run waiting lists in key year groups. This 2026 guide explains how Brussels admissions actually work, what documents to prepare, how assessments run, and how to improve your chances if you arrive mid-year.
The Brussels Admissions Calendar
Most Brussels international schools admit on a rolling basis, but the main intake is late August. For September 2026 entry, applications ideally go in between September 2025 and February 2026. Offers begin arriving from January. Because Brussels is a rotation city, however, places open constantly as families move on: a waitlisted application in March can convert into an offer in June. Mid-year admission in January is routine when space allows.
EU institution families should note that the European Schools follow separate enrolment procedures and windows set by the Central Enrolment Authority, with priority categories based on parents' employment. If you are eligible, run both processes in parallel rather than waiting for one to resolve.
Documents and Requirements
Prepare the past two to three years of school reports, the student's passport or ID, immunisation records, and confidential teacher references for secondary applicants. Schools may request educational psychologist reports where relevant, and most charge a non-refundable application fee of 100 to 350 euros. Certified translations into English or French speed up file review. Keep digital copies of everything: Brussels schools process applications almost entirely online.
How Assessments Work
Younger children are typically observed in a classroom or play session rather than tested. From upper primary onwards, expect standardised assessments in English and mathematics, often taken online before arrival, plus an interview with the student and parents. Schools are assessing readiness for the language of instruction and fit with the programme, not perfection: a strong report history and an honest picture of support needs count for more than a polished interview.
Schools to Know in Brussels
St John's International School
In Waterloo on the southern edge of Brussels, St John's is one of Belgium's most established international schools, teaching an IB continuum from early years to the Diploma. Its admissions team is experienced with corporate and diplomatic timelines and can turn complete files around quickly when places exist.
Bogaerts International School
BIS in Uccle offers the IB Programmes in a distinctive setting, with bilingual French-English options in the earlier years. It is popular with families wanting an international education that still connects children to francophone Brussels life.
Brussels International Catholic School
BICS combines an international English-medium curriculum with a values-based ethos and a strong French programme. Class sizes are moderate and admissions are personal, with family interviews at the core of the process.
French International School of Brussels
For francophone and francophile families, this school anchors the French curriculum pathway in Brussels, leading to the French baccalauréat with international sections. Admissions follow the French system's calendar, with dossiers reviewed from January for September entry.
Practical Tips for Brussels Applicants
Apply to two or three schools simultaneously; application fees are modest compared with the cost of arriving without a place. Tell schools your posting length honestly, as rotation-friendly schools plan around it. Choose your commune and school together: morning traffic between, say, Woluwe and Waterloo can double an optimistic commute. And if your employer has education allowances, confirm the invoicing arrangements early, because some schools bill employers directly and this can accelerate enrolment.
Compare verified profiles, fees and parent reviews for schools in Brussels and across Europe on International School Advisor.
Frequently Asked Questions
When should I apply to international schools in Brussels for 2026?
Between September 2025 and February 2026 for the main September 2026 intake. Brussels is a rotation city, so waitlists move constantly and mid-year entry in January is routinely possible.
What documents do Brussels international schools require?
Two to three years of school reports, passport or ID, immunisation records and teacher references for secondary students, plus an application fee of 100 to 350 euros. Certified translations into English or French help.
Do Brussels schools test children before admission?
Young children are observed rather than tested. From upper primary, schools typically assess English and maths, often online before arrival, and interview the student and family to confirm programme fit.