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Trillium International School

France, Paris

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The school at a glance
Instructs in English, French
Fees €7,590 - 15,290
Ages 2 - 11 years
Type Co-educational
Bus Service No
Academic offering
Curriculum British Curriculum, French Curriculum, Montessori Curriculum
Taught languages English, French
Strengths STEM, Languages, Sport
Clubs Academic and Intellectual, Arts and Creative, Cultural and Language
Stages Early Years, Primary School
Introduction

Trillium International School is an English–French bilingual school in Marly-le-Roi, about 30 minutes from Paris. The nursery follows Montessori pedagogy, with classes limited to 14 and an assistant in the Nursery. The preschool ages 2–4 explore the world through observation, sensory activities and hands-on learning, while Reception and Primary (ages 5–11) study the British and French curricula in a bilingual framework. The curriculum blends British and French content with Montessori-inspired methods, including a dedicated Science, Technology and Robotics Room where students engage in projects across Life and Earth Sciences, Physics and Chemistry, and Technology and Engineering. Pre-primary introduces programming with Bee-Bot, Cubetto, and ScratchJr, and Primary extends to visual coding and programmable robots such as Thymio and LEGO WeDo using iPads to diversify resources. English is taught alongside options for Chinese or Spanish. After-school care and holiday camps complement language development, sport, and cultural activities in a supportive bilingual community.

9 Rue de la Sabotte, 78160 Marly-le-Roi, France

The Essentials

Trillium International School has instruction in English, French.

Location
9 rue de la Sabotte, 78160 Marly-le-Roi, France. Marly-le-Roi is a commune in the Île-de-France region to the west of Paris. The area is residential with local shops and services.

Stages
Preschool; Primary School. The school is organized into early years and elementary levels.

Type
International school

Pupil Nationality Mix
Over 70 nationalities represented

Country affiliation
France
Diving Deeper

Uniform Requirement
Starter Uniform Pack includes: 1 Winter coat (Doudoune), 1 Raincoat, 1 P.E trouser, Cardigans, 2 White tee-shirt long sleeves, 2 White tee-shirt short sleeves, 2 Standard Trouser, and 2 Polos short sleeves.

Food Options
Canteen (Cantine) provides lunch options; Lunch Box is available; Snack (Fresh fruits) is offered. Morning daycare runs 8:00–8:45 AM; After School CLUB runs 4:00–6:00 PM; Garderie options include 4:00–5:00 PM, 4:00–6:00 PM, and 8:00–8:45 AM childcare; late fees apply after 6:00 PM.

Governance and Ownership
The school is governed by SARL COSMOPOLITE SCHOOL (R.C.S Versailles; Siren 939711511). Address: 9 rue de la Sabotte, 78160 Marly-le-Roi.
Fees

Annual tuition at Trillium International School ranges from EUR 7,590 to EUR 15,290 for 2026/27.

Application / Registration fees
- Enrollment (one-time, due at first registration): €1,200.
- Administration fee (due in the first year after enrollment): €500.
- Supplies and starter uniform (one-time, due at first registration): €700.

Admissions initial payment noted on enrolment form
- For some published enrolment material the registration amount is shown as €900 and school supplies €300 payable at submission of the registration form; families should expect an upfront registration/supplies payment when a place is reserved.

Tuition — monthly (published as monthly rates charged over 10 months)
- Nursery (ages 18 months–4 years) — monthly (over 10 months):
- Full-time (8:00–18:00): Tuition €759; Snack €27; Canteen €140; Morning care €87; After-school clubs €140; Total monthly amount €1,153.
- Full-time (9:00–16:00): Tuition €759; Snack €27; Canteen €140; Total monthly amount €926.
- Three-quarter time (9:00–15:00): Tuition €659; Snack €27; Canteen €140; Total monthly amount €826.
- Half-day morning (9:00–11:45, for children up to 3 years): Tuition €339; Snack €15; Total monthly €354.
- Half-day midday (9:00–13:00, for children up to 3 years): Tuition €359; Snack €15; Canteen €140; Total monthly €514.

- Reception (foundation year) — monthly (over 10 months):
- Full-time (8:00–18:00): Tuition €1,079; Snack €27; Lunch €140; Morning care €87; After-school clubs €140; Total monthly €1,473.
- Full day (9:00–16:00): Tuition €1,079; Snack €27; Lunch €140; Total monthly €1,246.

- Years 1–6 (ages 6–11) — monthly (over 10 months):
- Full-time (8:00–18:00): Tuition €1,135; Snack €27; Canteen €140; Morning care €87; After-school clubs €140; Total monthly €1,529.
- Full day (9:00–16:00): Tuition €1,135; Snack €27; Canteen €140; Total monthly €1,302.

Tuition — annual (published annual fee schedule for the academic year 2025–2026)
- Pre-primary & Primary (full-time) — annual tuition: €11,685.
- Pre-primary (4 days) — annual tuition: €11,185.
- Pre-primary (3 days) — annual tuition: €9,285.
- Pre-primary (2.5 days) — annual tuition: €8,785.
- Annual canteen (canteen/lunch) option: €1,395; lunch box option: €250; annual snack provision: €250.
- Morning daycare, after-school club and tutoring annual fees are published separately (examples: morning daycare 5 days €1,440; after-school clubs 4 days €2,475; tutoring 3 days €1,620).

Other recurring and optional charges
- After-school clubs (annual): examples include €2,475 (4 days), €1,987 (3 days), €1,238 (2 days), €973 (1 day).
- Tutoring (annual): examples include €1,620 (3 days), €1,070 (2 days), €650 (1 day).
- Morning daycare (annual): examples include €1,440 (5 days), €1,150 (4 days), €918 (3 days), €648 (2 days), €360 (1 day).
- Occasional/exceptional session daily rates also published (example: exceptional day €100).
- Late collection penalty: €10 every 10 minutes after 6:00 p.m.
- Returned cheque or refused direct debit charge: €100 per event.
- Fixed fee for reminders on unpaid accounts: €30 per letter.
- Discounts / promotional offers: a sibling discount is published (example: €1,000 discount from the second child); referral discounts may also apply.

Billing schedule and payment terms
- Payment options (installment plans) — a single final payment by bank transfer within 30 days of invoice, or SEPA direct-debit instalments on the 27th of month according to one of these schedules: six payments (27 Aug–27 Jan), ten payments (27 Aug–27 May), eleven payments (27 Aug–27 Jun), or twelve payments (27 Aug–27 Jul).
- Payments are due in advance according to the chosen schedule.
- Any payment made after the 27th of the month is considered late and is subject to a 10% surcharge.
- All bank transfer, SEPA direct-debit or cheque arrangements must use the school's published banking details or the signed SEPA mandate when relevant.
- For refusal/returned instruments the school applies the €100 returned-payment fee and may apply collection charges.

Boarding
- Boarding is not offered for the pre-primary and primary age ranges described; no boarding fees are published.

Uniform and supplies
- A starter uniform pack is charged as part of supplies: a starter pack is described in the published materials and the supplies/uniform charge is shown in the published fee schedule (see the supplies/uniform one-time fee above). Specific items in the starter pack include winter coat, raincoat, PE trousers, cardigans, polo and T‑shirts and standard trousers. Annual replacement uniforms and additional pieces are charged separately if required.
- Annual supplies-only fees for some ages (2–3 years) are shown as €400 in the published schedule for subsequent years.

Refunds, withdrawal and absence policy
- There is no refund for absence, dismissal/expulsion, or voluntary departure for periods already invoiced.
- If a family withdraws during the school year, the school must be notified by registered letter with acknowledgment of receipt with two months' notice.
- If a pupil leaves before 31 December of the school year the fees due are 70% of the tuition; after 31 December the fees are due in full (100%).
- Students arriving during the school year are billed as follows: arrivals before 31 December — 100% of the tuition; arrivals 1 January–31 March — 70% of the tuition; arrivals after 31 March — 40% of the tuition.
- No refund is given for absence or dismissal. Late or unpaid fees incur the penalties and charges noted above.

Accepted payment methods
- SEPA direct debit (mandate form used for recurring instalments).
- Bank transfer (virement) for single payments and transfers.
- Cheques are referenced in the payment conditions (returned-cheque fee applies).
- Invoicing and the chosen instalment schedule determine exact due dates and the instalment amounts.

Key practical notes for budgeting
- Monthly figures shown on the admissions page are published as “monthly over 10 months”; an annual fee schedule is also published and includes separate annual amounts for tuition, canteen, clubs and daycare.
- Additional optional services (clubs, tutoring, daycare, exceptional days) and incidentals (late collection, returned-payment fees) should be included when estimating total yearly cost.
Academics

Trillium International School teaches British Curriculum, French Curriculum, Montessori Curriculum for students aged 2 to 11.

Curriculum
British French curriculum adapted to all children with Montessori pedagogy. Nursery (Ages 2-4) focuses on discovering the world through observation, sensory experiences, and hands-on activities. Reception and Primary (Ages 5-11) introduce scientific concepts across Life and Earth Sciences, Physics and Chemistry, and Technology and Engineering. Pre-primary (Ages 3-6) provides a playful introduction to programming with Bee-Bot, Cubetto, Code & Go Mouse, ScratchJr, Lightbot, and Kodable. Primary (Ages 6-11) covers first steps in programming with visual coding (Scratch, Blockly, Code.org) and programmable robots (Thymio, Blue-Bot, LEGO WeDo), with creative projects and Robotics/Science workshops including a dedicated Science, Technology, and Robotics Room. English language classes are offered, and language options include Chinese or Spanish.
Wellbeing

Social and Emotional Learning (SEL)
The school prioritises pupils' well-being and personal development. The environment is safe, respectful and stimulating. Small class sizes and personalised support foster individual growth, and a relationship of trust with families underpins learning. The bilingual, international community supports social and emotional development in a multicultural setting.

Special Educational Needs (SEN)
The school provides support for learners with dyslexia, dyspraxia, dyscalculia, dysgraphia or giftedness, with the entire teaching team working with specialists to develop a personalised educational plan.

English as an Additional Language (EAL)
The school teaches in English and French as a bilingual programme. Preschool classes have approximately 60% English and 40% French; Primary classes follow the same distribution. Teachers are native or fluent in English and French, ensuring linguistic immersion and consistency across languages.

Mental Wellbeing
The school prioritises pupils' well-being and personal development in a safe, respectful, and stimulating learning environment, with small class sizes and personalised support to support mental well-being.
Parent Experience

Community
Trillium International School is an international English-French bilingual school located in Marly-le-Roi, just 30 minutes from Paris. It provides a caring, structured and academically demanding environment for children from preschool through primary school. The school community is international and welcomes families from Paris, Versailles, Saint-Germain-en-Laye, Rueil-Malmaison and other surrounding towns in the Île-de-France area. It offers bilingual education with daily exposure to both languages through teaching, communication, and school life activities.
Facilities

Facilities Overview
Trillium International School is an international English–French bilingual school in Marly-le-Roi, about 30 minutes from Paris. Preschool classes follow Montessori pedagogy and class sizes are limited to 14 students, with a Nursery class that has a full-time assistant. The Primary School follows a bilingual curriculum drawn from the British and French national curricula, with English and French instruction distributed across the year groups. A library, gardening/botany, yoga classes, pottery, cooking classes, and other activities are part of the student experience. Teachers are native or fluent in English and French, and learning is supported with targeted, small-group instruction and a mix of English and French literacy/language development.

Sports Facilities
The school offers after-school activities including a Multi-sports club with Gymnathlon for ages 3–11; after-school care runs daily from 4:00 PM to 5:00 PM. Holiday camps for ages 4–11 run during school holidays from 7:45 AM to 4:45 PM with lunch available, including Gymnathlon sports and English immersion. Weekly language clubs include learning Chinese and Spanish, and there are after–school programs and tutoring in English and French for Trillium students. These programs provide organized sport, language and enrichment activities in a bilingual setting.

Academic Facilities
The Preschool uses Kumon mathematics and the Jolly Phonics method for English and the Alpha method for French, with class sizes limited to 14 and a Nursery class with a full-time assistant. The Primary School follows the British National Curriculum and the French National Curriculum in a bilingual program, with CP: 21 English hours and 6 French hours; CE1–CE2: 21 English hours and 6 French hours; CM1–CM2: 18 English hours and 9 French hours. Pupils use iPads to diversify learning resources, and the curriculum employs a flipped classroom approach for History, Geography and Science. English, science and mathematics are taught through a globally minded, bilingual framework across the year groups.

Extra Curricular Facilities
Wednesday Afternoon English Clubs (Ages 3–11) run from 1:00 pm to 4:00 pm, with optional after-school care from 4:00 pm to 5:00 pm and a range of activities. After-School Classes include a bilingual environment with English-speaking coaches for the Gymnathlon-based multi-sports program, as well as holiday camps with English immersion. Learn Chinese and Spanish While Having Fun is offered for all ages and levels, with language learning through games, songs and activities. There is ongoing weekly after-school tutoring in English and French, with an After-School Program from 4:00 PM to 5:00 PM and holiday camps during school holidays. These offerings support language development, physical activity and cultural engagement in a bilingual community.
Extra-Curricular Activities

Academic & Intellectual
The school runs coding and robotics activities for Pre-primary through Primary. Bee-Bot, Cubetto, Code & Go Mouse, Thymio, Blue-Bot and LEGO WeDo introduce programming and robotics. ScratchJr, Scratch, Blockly and Code.org support visual coding, animations and games. Unplugged activities use logic games, puzzles and image sequences to teach algorithms.

Arts & Creative
Creative Projects include interactive stories, educational games and programming challenges. Students apply ideas through hands-on projects in coding and science activities. Creative storytelling and design tasks develop creativity and problem solving.

Cultural & Language
The school offers a genuinely bilingual English–French education with daily exposure to both languages. Teaching is delivered with about 60% English and 40% French. The curriculum draws on the British and French national curricula. Language clubs include English, French, Spanish and Chinese, with Wednesday afternoon English clubs open to all.

Social & Hobbies
Wednesday Afternoon English Clubs (ages 3–11) run from 1:00 pm to 4:00 pm and are led by Trillium teachers. After-school care runs 4:00 pm to 5:00 pm with snacks and supervision. Weekly after-school and tutoring programs cover English and French for Trillium students. Holiday camps run in October, February, April and July with gymnathon sports and English immersion.

Lifestyle & Wellbeing
Healthy meals are provided by a local caterer API. There is weekly after-school care from 4:00 pm to 5:00 pm with snacks. A multi-sports club with Gymnathlon offers sports, games and skill-building after school with bilingual English-speaking coaches. Holiday camps include Gymnathon sports and English immersion, with lunch available.
Languages

Language Provision
The school teaches in English and French. English language instruction runs alongside studies following the French national curriculum. The bilingual and bicultural program supports language development in both English and French.

Bilingual Teaching
The school provides bilingual education in English and French. The bilingual approach is central to its philosophy. English is taught in parallel with studies that follow the French national curriculum. Montessori-based teaching in small groups supports autonomy and confidence.
Admissions

Admissions
1. Age range and admissions policy: The school accepts pupils from age 2 (18 months depending on the child) through to the end of primary school (Year 6). It operates an open admissions policy and enrolments are accepted throughout the year, subject to availability in each class. The school offers bilingual education.

2. Documents and interview process: For primary pupils, previous school reports are requested. For admission to pre-nursery, an evaluation of the child's English level is not required. An interview with the Headteacher and the class teacher responsible will be organised to discuss each individual case. The small size of our classes enables the school to cater for almost any educational background and can be adapted to offer additional support if needed.

3. Special educational needs and interviews: Decisions regarding the admission of children with special educational needs are made by the Headteacher and the teaching team, based on the school's ability to meet the pupil's needs. An individual interview will be required for these pupils. The school will request a recent report from an educational psychologist to ensure that the teacher and all staff can meet the pupil's needs.

4. Enrolment form and fees: Enrolment Form Academic Year 2025–2026; Registration fees are €900 and school supplies fees are €300, payable at the time the registration form is submitted. Without payment, no place is reserved.
School Events
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