Cities / Paris / Trillium International School
Trillium International School
A small bilingual Montessori primary in Marly-le-Roi, about 30 minutes west of central Paris, for children from 18 months to age 10.
In brief
A small bilingual Montessori primary in Marly-le-Roi, about 30 minutes west of central Paris, for children from 18 months to age 10.
Trillium opened in late 2017 and was set up by parents who could not find a bilingual nursery and primary willing to support children with specific learning needs. Maximum class size is around 12, the pedagogy is Montessori, and the curriculum blends French and English national content so that children can transfer in and out of either system without falling behind.
Parents describe the team as kind and attentive and the setting as calm and family-like, which lines up with the original founding intent. The school works well for families who want the small-group Montessori feel through primary, particularly where a child needs a softer landing than a larger international school can offer. Marly-le-Roi is a fair commute from central Paris, so practical fit depends heavily on where you live in the western suburbs.
Fees
Annual fees
| Year level | Age | Fee |
|---|---|---|
| Pre-Primary Nursery | 3 | €9,810 |
| Pre-Primary Reception | 4 | €13,010 |
| Primary Year 1-6 | 5 | €13,570 |
One-time fees
| Item | Age | Fee |
|---|---|---|
| School supplies fee | €300 | |
| Registration fee | €900 |
Reviews
- Parent reviews are consistently positive about the bilingual programme, small class sizes, warm atmosphere, and attentive support.
- Families praise the setting as calm and green, and describe children as feeling well supported and happy.
- A separate local review mirror is more mixed, including praise for the small, caring environment and a complaint about conflict with leadership. The stronger current parent-review set remains positive, but the overall pool is still small.
Positives
- Small bilingual school feel. Parents value the French-English programme, small classes, family-like atmosphere, and individual attention.
- Warm support and wellbeing. Parent reviews repeatedly mention kind staff, good support, a calm environment, and children feeling happy at school.
Considerations
- Small but not entirely one-sided pool. The main current parent pool is very positive, while a local review mirror includes at least one leadership-related complaint.
Leadership
Alexandrine Deliancourt
Sandrine Lavecot serves as Head of School at Trillium International School, a bilingual French-British institution in Paris. The school is authorized and inspected by the French Ministry of Education and offers a British programme alongside French national curriculum. Students take French and British national assessments and prepare for entrance to secondary institutions including Lycée International (British and American sections), La Jonchère, and Collège de Noisy-le-Roi.
Academic results
- 2025 entrance examinations 100% success rate
- 2026 entrance examinations 100% success rate