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Trinity International School

Thailand, Bangkok

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The school at a glance
Instructs in English
Fees THB 154,250 - 220,870
Ages 3 - 18 years
Pupil numbers 450
Type Co-educational
Opened 2003
Bus Service Yes
Academic offering
Curriculum Advanced Placement (AP), American Curriculum
Taught languages English, Thai
Typical class size 25
Strengths Sport, STEM, Academic Enrichment
Clubs Arts and Creative, Cultural and Language, Community and Service
Stages Kindergarten, Elementary, Middle School, High School
Introduction

Trinity International School (TRIS), established in 2003 and located at 30 Sukhumvit Soi 36 in Bangkok’s residential Sukhumvit district, serves around 450 students aged 3 to 18. The school follows an American Curriculum based on California's Common Core, with the option to pursue Advanced Placement (AP) courses in upper grades. English is the language of instruction, and the school also teaches Thai and Mandarin. TRIS operates a school bus service, enhancing access from nearby neighbourhoods. The school is licensed by the Thai Ministry of Education and accredited by WASC and ONESQA. Notable strengths include emphasis on STEM (including a UC Berkeley partnership), academic enrichment through AP offerings, and a strong orientation toward service, rooted in values education.

30 Sukhumvit Soi 36 Lane 2, Bangkok 10110, Thailand

The Essentials

Trinity International School has 450 pupils, typical class sizes of 25, instruction in English.

Location
Trinity International School is located at 30 Sukhumvit Soi 36, Khlong Tan, Khlong Toei, Bangkok 10110. It sits in the Sukhumvit area, a well-connected part of the city, with Thonglor BTS station at the entrance to Soi 36, making it accessible for families using public transport. The neighbourhood is a mix of residential streets and commercial amenities, offering convenience for commuting parents.

Stages
The school offers education from Kindergarten (ages 3+) through Grade 12. This covers early years, elementary, middle school, and high school levels, with age-appropriate curricula for each stage.

Type
TRIS is a co-educational day school. It does not provide boarding facilities.

Additional learning support
The school provides Learning Support for students who require extra help, with teachers and support staff working with parents to meet individual needs. Students with limited English proficiency can join the ESL program until they are ready to join mainstream classes.

Country affiliation
TRIS follows the American (California) curriculum and is accredited by the Western Association of Schools and Colleges (WASC), a U.S.-based body.

Religious affiliation
The school is affiliated with the Seventh-day Adventist Church and incorporates values education based on Adventist principles.

School day structure
The school day runs from 07:30 to 15:00, with student arrival between 06:45 and 07:25. Students begin the day in homeroom with the national anthem, attendance, and announcements, and have scheduled breaks and a lunch period during the day.

Bus service
TRIS operates its own van service for transporting students to and from school.
Diving Deeper

Governance and Ownership
Privately owned Seventh-day Adventist (SDA) Christian school affiliated with the Thailand Adventist Mission.
Fees

Annual tuition at Trinity International School ranges from THB 154,250 to THB 220,870 for 2026/27.

Application & Placement Test Fee: THB 4,000 (one-time, non-refundable)

One-Time Entry Fees
Enrollment Fee:
K1–K3: THB 80,000
G1–G12: THB 110,000

Development Deposit: Waived until July 31, 2026.

Registration Fee: THB 15,000 for all grades.

Books & Damage Deposit: THB 22,000 (G6–G12 only; refundable if materials are returned in good condition).

Annual Tuition Fees
K1–K3: THB 198,000
G1–5: THB 203,900
G6–8: THB 220,870
G9–12: THB 220,870

Annual Recurring Fees
General Fee: THB 36,045 – THB 39,040 depending on grade

Lunch & Morning Snack: THB 15,550 (K1–K3) to THB 24,400 (G9–12)

Parent/Teacher Association Fee: THB 500

Other Fees
EAL Fee: THB 30,000 per semester (if applicable)

Re-registration Fee: THB 15,000 annually

Uniforms: THB 1,200 – THB 1,700 per set; Pathfinder and PE uniforms also required

PSAT (G10 & G11): THB 1,200

AP Courses (HS): THB 15,000 per subject

School Bus: THB 25,000 – THB 40,000 per semester

Payment Methods
Payments are accepted via bank transfer; confirmation required from the finance office.

Refund Policy
Refunds are provided only for refundable deposits under stated conditions.
Academics

Trinity International School teaches Advanced Placement (AP), American Curriculum for students aged 3 to 18.

Curriculum
Trinity follows an American curriculum based on the California Department of Education’s K‑12 standards, with content adapted to support Math and Science through a partnership with UC Berkeley’s GEMS program. From Kindergarten through Grade 12, students follow this American-based program, integrating values education rooted in Seventh‑day Adventist principles. Early grades (K–5) focus on foundational literacy, numeracy, and values such as honesty and respect, while middle and high school include Advanced Placement (AP)‑level coursework in subjects like Calculus, Physics, Chemistry, and more. The curriculum also includes an English as a Second Language (ESL) program to support students not yet fluent in English, including summer school, until they can move into mainstream classrooms. Overall, TRIS provides a structured academic progression from early years to Grade 12 that combines U.S. academic standards with holistic character development and technical enrichment.

Academic calendar
Wellbeing

Social and Emotional Learning (SEL)
While the school states that lessons emphasize collaborative learning, critical thinking, and practical application within its California-aligned curriculum, there is no direct mention of a dedicated “SEL” program, staff, or formal initiative focused explicitly on social and emotional learning.

Special Educational Needs (SEN)
Trinity offers “Learning Support”, where teachers, learning support staff, and parents collaborate to tailor support for each student’s needs. However, the school does not publicly detail the types of special educational needs it supports or confirm whether it operates as a specialist SEN school.

English as an Additional Language (EAL)
The school provides English as an Additional Language (EAL) support through its English as a Second Language (ESL) program. This program is designed to help students with limited English proficiency improve their language skills, with smaller class sizes and tailored instruction to support their transition into mainstream classes.

Mental Wellbeing
There is no specific information on the school site regarding mental wellbeing programs, dedicated staff like counsellors, or wellbeing-focused initiatives.

Safeguarding
The website does not publicly share details about safeguarding policies, child protection measures, or how these are enacted within the school community.
Parent Experience

History
Trinity International School (TRIS) was founded in 2003 and operates as a privately owned Seventh‑day Adventist Christian education school that follows California Common Core standards. It was established to serve both expatriate and Thai families seeking international education at a relatively affordable cost.

Community
The school community frequently gathers for events that involve students, staff, and parents. Annual highlights include the Christmas Fun Fair, featuring performances and games organized by students, parents, and teachers. Another key cultural event is Sports Day, where students take part in athletic activities and community-building activities. The school has also celebrated Book Week, during which students and staff dress as favourite book characters and share creative expressions through art and writing.

Parent Teacher Association (PTA)
Information about a formal Parent Teacher Association (PTA), including specific groups, initiatives, or events led by parents and teachers, is not publicly disclosed on the school’s website.
Gallery
Facilities

Facilities Overview
The Trinity International School campus operates Kindergarten through Grade 12 in Bangkok, located at 30 Sukhumvit Soi 36 Lane 2, Bangkok 10110. It has modern facilities and a brand-new building. The campus sits on Sukhumvit 36 in the heart of Bangkok and is close to Thonglor BTS. The main language of instruction across all programs is English.

Sports Facilities
The school offers competitive interscholastic athletics.

Academic Facilities
The campus uses leading technology in classroom teaching. The school offers three educational programs (Regular, SPACE, Online) for Kindergarten through Grade 12, with English as the main language of instruction.

Extra Curricular Facilities
After-school activities and clubs are available. Competitive interscholastic athletics are part of extracurricular offerings.
Extra-Curricular Activities

Academic & Intellectual
The school provides a comprehensive K-12 curriculum directed by the California Department of Education and aligned with Common Core standards. Language Arts, Mathematics, and Science are taught in English with an emphasis on collaborative learning and critical thinking. Thai Language and Culture is taught across grade levels, and high school offers AP subjects.

Arts & Creative
Art and Music are part of the K-12 curriculum. Elementary through High School includes Computer Skills & Robotics and Animation & Programming as offerings. High School also provides related arts electives that support creative and technical expression.

Cultural & Language
Thai Language and Culture is taught across grade levels. English is the primary instructional language and the school emphasizes mastery of English. The school is a privately owned Seventh-day Adventist Christian Education School.

Social & Hobbies
TRIS offers extracurricular activities and events including Spiritual Emphasis Week, Pathfinder ceremonies and camps, Book Week, Loy Krathong celebrations, and Songkran. TRIS Times is a student publication. Tris Got Talent, Christmas Celebration, and the Autumn Festival are part of the school's events.

Community & Service
The mission provides affordable values-oriented education in a multinational environment. Graduates are prepared to be active in local and global communities. ESLOs include working hard and thinking critically, appreciating cultural diversity, and being an honest, responsible community member.

Leadership & Professional
The school emphasizes leadership and professional competencies as part of its ESLOs and mission. AP subjects in high school include Calculus, Physics, Literature, Chemistry, Language, and Biology. The curriculum prepares graduates for higher education and professional life.

Lifestyle & Wellbeing
Athletics, physical education, and health are integral to TRIS. The school competes in the Greater Bangkok Athletic Conference. The program emphasizes lifelong health and physical development.
Languages

Language Provision
The school teaches in English as the language of instruction across the K-12 curriculum. Thai Language and Culture is taught at all grade levels. An ESL program supports students with limited English, with leveled classes and a dedicated ESL team. The curriculum is directed by the California Department of Education and aligned with Common Core standards, with AP subjects offered in high school.
Reputation

Awards
The school does not publicly disclose any awards received in the past five years.

Accreditations
WASC (Western Association of Schools and Colleges)
A U.S.-based accrediting body that evaluates and certifies the quality and effectiveness of schools and colleges through rigorous standards and peer review.

ONESQA (Office for National Education Standards and Quality Assessment)
Thailand’s national agency is responsible for evaluating and accrediting educational institutions for quality assurance.

Thai Ministry of Education
The government authority that licenses and regulates educational institutions in Thailand, ensuring compliance with national education laws and policies.

California Department of Education
Oversees the California state curriculum and educational standards, ensuring schools meet requirements for American curriculum delivery.
Admissions

Admissions
1. Submit Application and Fee
Parents complete the TRIS Application for Admission and pay a non-refundable application fee. The application must be accompanied by required documents, including a recent medical report, immunisation record, and the student’s most recent school report.

2. Take Placement Test
Applicants aged six or older take a placement test. Students with low scores in English are required to join the ESL program.

3. Confirm Acceptance and Pay Fees
Once accepted, families must pay one-time entry fees and annual fees. Additional costs may apply for ESL, graduation, and parent council membership.

4. Collect Registration Package
Families receive a package with key information, school calendar, timetable, request forms (e.g., transport, lockers, online access), and the Student/Parent Handbook. This package also includes teacher contact details and school layout maps.

Scholarships
The school does not publicly disclose information about scholarships or financial aid in the provided admissions materials.

Waitlist
The school operates an open admissions policy, meaning students can enrol at any time during the school year if places are available. There is no publicly stated waitlist or pool system.
School Events
The school has not added events
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