This comparison cannot be a full-year price ranking yet. SISB Rayong publishes a trilingual international route from age two and dated 2026/27 tuition of ฿401,700–฿789,300. ACS Sriracha serves Kindergarten 1 through Secondary 6 on Thailand's national curriculum and publishes ฿25,600–฿108,930 in combined Term 1/2569 charges for selected returning grades, programmes and day or boarding status. Obtain a complete annual quote before comparing cost.
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Both schools publish provision from the early years through secondary, but they are not interchangeable. SISB follows an international Singapore-to-Cambridge sequence. ACS Sriracha follows Thailand's Basic Education Core Curriculum with Modern Language, Intensive English and Special English programmes; it is a Thai national-curriculum school rather than an English-medium international school.
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| Dimension | SISB Rayong | Assumption College Sriracha |
|---|---|---|
| School | Singapore International School Rayong | Assumption College Sriracha |
| Age span | Ages 2–18; 2026/27 new applications Nursery 1–Grade 10 | Kindergarten 1 through Secondary 6 |
| Curriculum | EYFS, Singapore Primary, Singapore/UK hybrid Grades 7–8, Cambridge IGCSE and AS/A-Level | Thai Basic Education Core Curriculum; Modern Language, Intensive English and Special English programmes |
| Published tuition | Dated 2026/27: Nursery ฿401,700; Kindergarten ฿429,600; Primary ฿470,700–฿567,300; Grades 7–10 ฿609,300–฿650,700; Grades 11–12 ฿789,300. | Term 1/2569 combined education and other charges for selected returning grades: ฿25,600–฿108,930, depending on programme and day or boarding status. Not a full-year tariff and excludes entry grades K1, P1, M1 and M4. |
| Named extras | Application ฿5,000; assessment ฿5,000; enrolment ฿220,000; deposit ฿50,000; resources, meals and ELS separate. | Term 2, entry charges and separately itemised boarding, meals, transport, uniforms, books, examinations and activities remain unpublished. |
| Planning point | Fees reach Grade 12, but 2026/27 new applications stop at Grade 10. | Match the exact grade, language programme and day or boarding status, then obtain a complete annual quote. |
| Sources | campus overview · 2026/27 fees | school site · Term 1/2569 charges · programme evidence · OPEC record |
| Live editorial | Read the SISB Rayong editorial | Read the ACS Sriracha editorial |
ACS's public figures cover only Term 1/2569 and selected returning grades. Request SISB’s grade, entry, resources, meals, ELS and transport rows alongside an ACS annual quote naming programme, day or boarding status, both terms, entry charges, meals, books, transport, insurance, uniforms, activities, examinations, support and refund terms.
SISB publishes dated 2026/27 tuition of ฿401,700–฿789,300. ACS publishes ฿25,600–฿108,930 in combined Term 1/2569 charges for selected returning grades, programmes and day or boarding status; this is not a complete annual tariff.
SISB moves from EYFS and Singapore Primary into Cambridge IGCSE and AS/A-Level. ACS follows Thailand's core curriculum through Modern Language, Intensive English and Special English programmes.
SISB’s tariff reaches Grade 12 while 2026/27 new applications stop at Grade 10. ACS families need a complete annual quote plus written evidence of subject languages, examinations, final Thai credentials and boarding inclusions where relevant.
The schools overlap from kindergarten through secondary, yet lead toward different records of learning. SISB combines English, Thai and Mandarin with Singapore and Cambridge stages; ACS Sriracha combines Thai national credentials with programme-dependent English intensity.
Ask both schools to state the child’s proposed class, start date, age cut-off and following year. SISB publishes Nursery through Grade 12 fee rows, though 2026/27 new applications stop at Grade 10. ACS describes Kindergarten 1 through Secondary 6 and offers day and boarding routes.
Do not translate Grade, Year, Primary and Secondary labels by number alone. Request the placement test, class equivalence, calendar and written progression route, particularly if a child may move between an international system and the Thai system later.
SISB records English, Thai and Mandarin. Ask for weekly allocation, subject language, newcomer support and the transition from Singapore stages into Cambridge qualifications.
ACS Sriracha records Thai and English. Ask which subjects are taught in each language at the proposed stage, how English proficiency is assessed, what Thai literacy level is expected and how newcomers receive support.
At both visits, request anonymised work and the report format in each teaching language. Observe how teachers explain unfamiliar tasks and whether translation supports learning or merely task completion.
SISB’s 2026/27 tuition runs from ฿401,700 to ฿789,300. Application and assessment are ฿5,000 each, enrolment ฿220,000 and deposit ฿50,000. Resources are ฿30,500–฿84,000, meals ฿26,400–฿39,000 and ELS ฿20,000–฿30,000 per term.
ACS publishes combined Term 1/2569 education and other charges of ฿25,600–฿108,930 for returning K2–K3, P2–P6, M2–M3 and M5–M6 pupils, depending on programme and day or boarding status. Entry grades K1, P1, M1 and M4 and Term 2 are not covered, so these figures are not comparable with SISB's full-year tuition.
Ask ACS for a dated offer naming the child, grade, Modern Language, Intensive English or Special English programme, academic year, both terms, entry charges, meals, books, transport, insurance, uniforms, activities, examinations, support and separately itemised boarding. The annual total remains unknown until every compulsory row is written.
SISB publishes Cambridge IGCSE and AS/A-Level after its Singapore stages. Confirm which senior grades currently operate, accept newcomers and offer each subject at the Rayong campus.
ACS describes Kindergarten 1 through Secondary 6 under Thailand's national curriculum. Ask which final Thai credential and transcript pupils receive, which subjects use English in the selected programme and what language evidence is supplied for applications outside Thailand.
Rehearse relocation after two years. Request the transcript, curriculum map, language evidence, grading scale and teacher references each school would supply.
SISB publishes ELS at ฿20,000–฿30,000 per term. ACS Sriracha does not publish a usable language- or learning-support tariff in the current ledger.
If support matters, request the staff member, group size, minutes per week, review date, progress measure, exit criteria and price. Separate English acquisition from other learning needs.
Bring existing reports before assessment and ask admissions to state any limitations in writing.
SISB’s published sequence reaches Cambridge IGCSE and AS/A-Level, but the Rayong campus opened in 2023 and its 2026/27 new-applicant range stops at Grade 10. Ask which secondary grades are operating now, how many pupils are in each cohort, which IGCSE subjects are taught and when the first Rayong AS/A-Level cohort is expected.
ACS describes secondary through Secondary 6. Ask which upper-secondary programmes run now, which subjects are taught in English, which Thai national examinations apply and what university-counselling evidence the current cohort receives.
For either school, request anonymised subject-choice forms, a sample transcript, the examination calendar and the university-counselling timeline.
ACS has a campus-specific current Office of the Private Education Commission database record at 29 Moo 10, Surasak. That verifies a Thai private-school record; it does not turn an English-intensity programme into an international qualification. SISB’s current ledger record does not list a campus-level accreditation.
Ask each school for campus-specific register or examination evidence, then compare teacher qualifications, class size, homework and reporting cadence. Keep regulatory registration separate from curriculum and qualification claims.
SISB publishes a 2% full-year tuition discount, sibling tuition discounts of 5% for the second child and 10% for later children, and a 20% enrolment reduction from the second child. ACS's Term 1 notice offered a ฿1,000 saving through 30 April 2569 and ฿500 from 1 May through 30 September 2569 for SWIS payment; these are payment-timing savings, not evidence of a recurring annual discount.
Ask ACS to state the standard annual price first and any concession separately. A discount has no decision value without its base, duration and conditions.
SISB is in Nong Taphan, Ban Khai; ACS Sriracha is in Surasak, Si Racha. Drive both routes at arrival and collection times, including work and sibling stops.
Neither ledger record supplies a comparable transport quote for the family address. Ask whether a route is available, then request pickup windows, vehicle time, supervision and the exact address price. SISB is day-only; ACS offers day and boarding places on a school-described campus of more than 500 rai.
Save offers, fee schedules, calendars and placement answers together.
Arrive before the class begins and watch the transition from gate to room. Record how quickly the child separates, who welcomes them, which language adults use and whether the routine is understandable without repeated prompting. Ask what happens on a difficult morning and how parents are informed. A polished tour after children leave cannot answer these questions.
Ask for a starting assessment, mid-year report and anonymised work from the proposed class. At SISB, trace English, Thai and Mandarin into Singapore and Cambridge stages. At ACS Sriracha, inspect work in Thai and English and trace how the selected Modern Language, Intensive English or Special English programme covers the Thai Ministry learning standards.
Record the balance of adult-led, child-initiated, individual and group activity during the visit. Ask how teachers adapt the same task for a child who is new to English, already reading or reluctant to join a group. The right environment is not defined by one teaching philosophy; it is the setting where staff can explain how this child will participate and progress.
Confirm arrival supervision, meals, allergies, illness procedures, late collection and activities. SISB prices meals and resources separately. ACS Sriracha does not publish separately itemised current prices for meals or transport, so ask whether each service is included in the child's Term 1 row and require a written annual inclusion and price list.
Place both calendars beside the family’s work calendar. Count closures that require alternative care and ask whether holiday programmes are offered, separately registered or guaranteed to enrolled pupils. A school-year tuition comparison does not capture care purchased during long breaks.
SISB is in Nong Taphan, Ban Khai; ACS Sriracha is at 29 Moo 10, Surasak, Si Racha. Verify each entrance, transport route and contract address before payment. Test gate queues, parking and the return journey.
SISB is day-only, while ACS offers day and boarding places. Boarding families should request room arrangements, weekday and weekend supervision, medical cover, leave rules, all compulsory charges and the exact opening and closing calendar before treating residence as solved.
For each school, finish the sentence: “This place works if…” Include the quoted total, language routine, classroom fit, support availability, care hours, travel ceiling and next-school plan. Then write the conditions that would trigger a review. This prevents a single attractive feature from hiding an unresolved cost or transition risk.
Run the same exercise for two future dates. At age six, both schools may be usable, but SISB's international primary sequence and ACS Sriracha's Thai bilingual primary sequence create different language and transfer demands. At age eleven, compare SISB's growing Cambridge transition with ACS Sriracha's Secondary pathway, present subject languages and support needs.
Before signing, compare the two schools’ invoice language line by line. Ask each admissions team to mark every compulsory, optional, refundable and one-time row, then calculate cash due before the first day, the complete first year and a normal later year. Keep every ACS fee row open until a dated signed offer resolves it.
Also rehearse a mid-year move. Ask what notice is required, which reports and curriculum records would be released, how deposits are returned and whether prepaid services are refundable. Families using the Eastern Seaboard industrial corridor should test both routes at real collection time, because a lower fee cannot compensate for an unsustainable daily journey.
Ask how each school handles a mid-year departure before assuming either transfer will happen neatly at the end of a stage. Record required notice, reports supplied, outstanding-fee conditions and whether unused services can be refunded. A family expecting relocation should weight these documented terms alongside teaching and price.
Do not pay while a condition remains material and unanswered. Ask admissions to correct the offer email, retain SISB's 2026/27 schedule and ACS's dated personalised quote, and note who supplied every grade and support answer. That record makes the decision auditable.
No full-year comparison is possible. SISB publishes a dated 2026/27 schedule; ACS publishes lower-looking combined Term 1/2569 charges for selected returning grades, but not a complete annual or all-entry-grade tariff.
No. SISB combines Singapore and Cambridge stages. ACS follows Thailand's national curriculum through Modern Language, Intensive English and Special English programmes.
SISB publishes ages 2–18, with 2026/27 new applications through Grade 10. ACS describes Kindergarten 1 through Secondary 6.
Ask for grade availability, tuition, application, assessment, enrolment, deposit, resources, meals, transport, trips, devices, ELS and refund terms.
Ask for academic year, both terms, exact grade and programme, day or boarding status, tuition, every entry charge, meals, transport, books, uniform, insurance, activities, examinations, language support and refund terms.
Use the decision framework above to weigh curriculum, fees, continuity, location and your child’s fit.