International School of London vs TASIS The American School in England
🇬🇧 London · Side-by-side comparison on verifiable public data.
Both carry a public inspection verdict: International School of London is Ofsted "Good" and TASIS The American School in England is Independent Schools Inspectorate (ISI) "Met all standards (2023 routine, post-2023 framework)" — a rare pairing where an official quality rating can be compared head-to-head. One practical difference: TASIS The American School in England offers boarding while the other is day-only — decisive for families who need a residential option. Verify current fees against each school's own figures (see the table below).
Key Facts
| International School of London | TASIS The American School in England | |
|---|---|---|
| Curriculum | IB | American / IB |
| Ages | 3-18 | 3-18 |
| Languages of instruction | English | English |
| Annual fees | £24,630–£39,640/year (2026/2027, ages 3–17; figures incl. VAT where applicable) | Day £15,600-£37,170/yr; boarding £69,650/yr (2026-27, inc. VAT) |
| Enrollment | — | 646 |
| Boarding | Day only | Yes |
| Inspection rating | Ofsted: Good | Independent Schools Inspectorate (ISI): Met all standards (2023 routine, post-2023 framework) |
| Accreditations | Council of International Schools (CIS), International Baccalaureate Organization (IBO) | NEASC, CIS, IB, ISA |
Strengths
- ✓Exceptional mother-tongue programme — 24 home languages taught as part of the curriculum, a genuine sector outlier
- ✓Strong bilingual outcomes — about half of leavers earn the bilingual IB Diploma, well above the IB world average
- ✓Full IB continuum (PYP, MYP, DP) under one provider, giving age-3-to-18 curricular coherence
- ✓Long pedigree and accreditation — founded 1972, CIS-accredited, authorised IB World School (code 000057)
- ✓Genuinely international and non-selective — 54 student nationalities across the IB programmes, open admissions
- ✓Dual American Diploma plus AP and IB Diploma pathways, giving families genuine curriculum choice in the Upper School
- ✓Triple accreditation by NEASC, CIS and the IB, plus ISA membership and ISI inspection
- ✓Highly international community of more than 70 nationalities
- ✓Boarding available from age 13, with a green Surrey campus close to London and Heathrow
- ✓Dedicated International Section providing English-as-an-additional-language support
Trade-offs
- !Ofsted rating is 'Good', not 'Outstanding', so it is not in the top inspection band
- !High fees (up to £39,640/year) place it among the more expensive London options
- !Split-site model (Chiswick primary/middle, Ealing Diploma College) rather than a single campus
- !No British (A-level/GCSE) or American track for families wanting a non-IB pathway
- !Fees sit at the premium end, with full-year boarding at £69,650 and senior day fees above £37,000
- !No published verbatim 'Excellent' ISI grade, as recent inspections use the met / not-met framework
- !Less suited to families seeking a British GCSE / A-Level route, which the school does not offer
- !Quantitative IB and AP results are not prominently published, limiting outcome comparison
Best Fit For
- • Internationally mobile families wanting a globally portable IB pathway
- • Multilingual households wanting their child's mother tongue actively maintained
- • Students who will sit the bilingual IB Diploma
- • Families seeking a non-selective school with a strong EAL on-ramp into English
- • American and international families wanting a US-style education near London
- • Students who may relocate within the global TASIS or US university system
- • Families seeking a choice between AP and the IB Diploma under one roof
- • Boarders aged 13-18 wanting a campus close to Heathrow
University Placement
School-reported · not independently verified
School-reported, unverified: published higher-education destinations (2012–2025 dataset) include King's College London, UCL, Imperial College London, Warwick, Edinburgh, Manchester and Bristol in the UK, plus international destinations such as Bocconi, Sciences Po, McGill, University of Toronto, University of Chicago and Keio University.
School-reported, unverified: graduates pursue admission to universities in the United States, the United Kingdom and worldwide; specific destination data was not verified from a primary source.
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Frequently Asked Questions
Should I choose International School of London or TASIS The American School in England?
International School of London is best for: Internationally mobile families wanting a globally portable IB pathway. TASIS The American School in England is best for: American and international families wanting a US-style education near London. The right choice depends on target curriculum, budget, and family priorities — the two are not linearly comparable.
How do fees compare between International School of London and TASIS The American School in England?
International School of London: £24,630–£39,640/year (2026/2027, ages 3–17; figures incl. VAT where applicable). TASIS The American School in England: Day £15,600-£37,170/yr; boarding £69,650/yr (2026-27, inc. VAT). Verify against each school's own published fees; some figures are sourced from third-party aggregators.
What curricula do International School of London and TASIS The American School in England offer?
International School of London: IB. TASIS The American School in England: American, IB. International School of London inspection: Ofsted "Good". TASIS The American School in England inspection: Independent Schools Inspectorate (ISI) "Met all standards (2023 routine, post-2023 framework)".
Do International School of London or TASIS The American School in England offer boarding?
International School of London: day school only. TASIS The American School in England: offers boarding.
Questions parents ask
This comparison is BrightKey's independent assessment using verifiable public data only. University-placement figures are school-reported and not independently verified. BrightKey takes no payments from schools. Our method →