SIAM International School is a British-curriculum school on Rangsit-Nakhon Nayok Road running a continuous pathway from nursery at age two to A-Level at eighteen, with its own Cambridge examination centre and a recently introduced boarding programme. It was entirely absent from BAANLYY before this pass, despite being one of only a handful of schools in the province that can take a child through to a university-entrance qualification -- and the only British one.
Where this school stops
This is Pathum Thani’s first question, not its last. Three of the province’s eight schools end at roughly age eleven — including two of the best-known names in the AIT and Thammasat corridor.
18. SIAMIS is one of only five schools in Pathum Thani that takes a child all the way through to a university-entrance qualification, and it does so on a single campus with no distance-learning component advertised for the sixth form -- a point worth confirming directly, because in Pattaya, Koh Samui and Krabi the equivalent claim turned out to mean blended or online delivery.
Where the campus actually is
55/5 Moo 1, Rangsit-Nakhon Nayok Road, Pathum Thani
On Rangsit-Nakhon Nayok Road, the same eastward corridor as Sarasas Witaed Rangsit -- so the two are realistic alternates for one another on the school run. Expect a car journey; confirm whether a school bus covers your address before assuming it does.
Rail: today, and in 2029
The SRT Dark Red Line currently terminates at Rangsit. Contracts for the 8.84 km extension to Thammasat University’s Rangsit campus — four stations at Khlong Nueng, Bangkok University, Chiang Rak and Thammasat University Rangsit Campus — were signed in May 2026, with construction expected to start in July 2026 and service targeted for 2029.
Not on any current rail. The Red Line terminates at Rangsit and the Phase II extension runs north-west up the Phahonyothin corridor towards Thammasat -- it does not serve Rangsit-Nakhon Nayok Road, which runs east. This campus is a car or school-bus run today and will still be one in 2029.
Area guides families use for this school run: Rangsit & Future Park · Outer Housing Estates (Moobans)
The curriculum pathway, stage by stage
- Nursery, ages 2-5 -- the school's stated first structured learning experience.
- Kindergarten, ages 5-6 -- described by the school as confidence and language building.
- Primary, ages 6-11 -- foundations in English, mathematics and science.
- Lower Secondary, ages 11-14 -- explicitly framed by the school as IGCSE preparation.
- IGCSE and A-Level, ages 15-18, taught on campus. The school operates its own examination centre.
Accreditations & authorisations
Worth separating: an examination-board authorisation (Cambridge, IB, CBSE, College Board) means a school may enter pupils for those exams. A whole-school accreditation (WASC, CIS, COBIS, Cognia, ISQM) assesses the school itself. Both matter; they are not the same claim — and an accreditation can cover only part of a school’s year range.
- Cambridge pathway to IGCSE and A-Level, with the school operating its own examination centre (a dedicated item in its own site navigation).
- The school publishes NO whole-school accreditation -- no CIS, COBIS, WASC, Cognita or ISQM mark appears anywhere on its site. That is a material difference from KIS Reignwood Park and Thai International School, and it is stated here plainly rather than left to inference.
Religious character
None published. The school states no religious foundation, statement of faith, chapel requirement or compulsory religious studies credit anywhere on its own site.
Boarding
Yes -- boarding was introduced as part of the school's recent restructuring, and it publishes accommodation for both Thai and international students. Because the programme is new, ask specifically who supervises overnight, what the staff-to-boarder ratio is, and how many boarders are actually resident this year rather than how many beds exist.
Who it suits
Families who want a British route all the way to A-Level without Bangkok fees or a Bangkok commute, and families outside Pathum Thani who need boarding at a lower price point than KIS Reignwood Park. The school markets itself explicitly as the affordable international option in the province.
What we could not verify — and where sources disagree
We publish these openly rather than smoothing them over. A school guide that hides its uncertainty is not much use to a family making a decision this big.
- The school is in the middle of a publicly announced transformation -- new principal (Jan Botha), new director (Sukanya Wattanavichian), reorganised departments, and new golf, dance, music and boarding programmes. Almost everything distinctive about SIAMIS today is recent. Ask how long each programme has actually been running.
- No whole-school accreditation is published. The Cambridge relationship is an examination authorisation, not an inspection of the school.
- The school does not publish its district on its own site -- only 'Pathum Thani'. We publish the street address it gives and do not assert a district we cannot confirm.
- Genuinely to the school's credit, and unusual enough to state: SIAMIS names its Designated Safeguarding Lead publicly, with his background, on its own homepage. Most schools in this rotation publish no named safeguarding contact at all.
Ask every Pathum Thani school this
- Does this school go as far as your child needs -- or is it a staging post? Three of the province's eight schools stop at roughly age 11, including the two best-known names in the AIT and Thammasat corridor. If your child is nine, you are choosing two schools, not one. Ask which schools families here typically move on to, and whether the school helps with that transfer.
- Ask about rail in two tenses. Today the Red Line terminates at Rangsit and no Pathum Thani campus has a station. Contracts for the extension to Thammasat Rangsit -- with a station at Khlong Nueng -- were signed in May 2026, with service targeted for 2029. Whether that is relevant to you depends entirely on how long you are staying.
- Check what the school year actually is. Global Indian International School runs an April-to-April Indian academic year; every other school here runs an August start. Moving mid-cycle between the two costs a child half a year in either direction.
- Is the accreditation whole-school, or is it an examination-board authorisation, and does it cover the year group your child is entering? Thai International School's WASC accreditation is stated by the school as covering Nursery to Grade 6 -- so a programme above that line is not inside the same claim.
- Is it a school, or a programme inside a school? The Invictus International Programme is an international pathway delivered within Sathitpathum Demonstration School, not a standalone international campus. That is a real and legitimate model, and it is not the same thing a directory listing implies.
- Drive the run at 07:00 on a weekday before you sign a lease. Phahonyothin, Rangsit-Nakhon Nayok Road and the Rangsit junction at rush hour bear no relation to the same roads at midday, and Pathum Thani's school geography is spread across four districts.
- Ask what the year group's actual size is this year, not the school's total roll. Several schools here are small by design, which many families want -- but you should know the number before you decide.
- If faith or national curriculum matters to you in either direction, ask directly. Pathum Thani's eight schools include British, American, IB, Indian CBSE, Cambridge-bilingual and Thai-bilingual routes, and they are not interchangeable.
BAANLYY does not rank, endorse or accept payment from schools. Facts on this page are compiled from SIAM International School (SIAMIS)'s own published material and independent cross-checks, and we deliberately publish no per-school fee figures — they change annually and a stale number is worse than none. Always confirm current admissions, fees, year groups, accreditation status and campus details directly with the school. Visit the official SIAM International School (SIAMIS) page →
Sources & References
Primary and official sources are cited above. Government rules, fees and procedures in Thailand change over time and vary by office; always confirm current requirements with the relevant authority before relying on them. BAANLYY never takes paid placement in editorial content.
Find a home for this school run
Pathum Thani’s schools are spread across four districts and no campus has a rail station yet. Settle where the school stops first, then match an area.
