The choice most expat families face
When an international family arrives in Portugal, one of the first and most consequential decisions is where to enrol their children in school. The choice most often comes down to two broad options: a fully international school (teaching in English, following a foreign curriculum like IB, Cambridge or American) or a Portuguese bilingual school (teaching primarily in Portuguese with a strong English programme).
Both pathways have merit. The right choice depends on factors specific to your family — how long you plan to stay in Portugal, your children's ages and language history, your budget, and what you want the educational experience to give them. This guide lays out the key differences clearly so you can decide with confidence.
What is an international school?
An international school in Portugal teaches its full curriculum in English (or in some cases French, German or Spanish) and typically follows an internationally recognised qualification framework — most commonly the International Baccalaureate (IB), the Cambridge International programme, or the British National Curriculum. A smaller number follow the American curriculum leading to a US high school diploma.
Key characteristics:
- Language of instruction: primarily English (or another non-Portuguese language)
- Curriculum: IB, Cambridge, British, American or another international framework
- Student body: heavily international, though increasingly includes Portuguese families seeking English immersion
- Cost: typically €10,000–€25,000 per year in Lisbon and Porto metropolitan areas
- Portuguese language teaching: offered as an additional subject, not as a medium of instruction
What is a bilingual school?
A bilingual school in Portugal follows the Portuguese national curriculum but delivers a significant portion of instruction in English. Most accredited bilingual schools in Portugal operate under the Ministry of Education's bilingual school certification (Escola Bilingue certificada), which guarantees a minimum of 50% of instruction in English across certain subjects.
Key characteristics:
- Language of instruction: Portuguese and English, with subject distribution varying by school
- Curriculum: Portuguese national curriculum (leading to Portuguese national qualifications)
- Student body: predominantly Portuguese, with a growing international component
- Cost: typically €4,000–€12,000 per year — significantly less than international schools
- Portuguese language teaching: full Portuguese language and literature as a core subject
Head-to-head comparison
Language development
This is where the two paths diverge most significantly. At an international school, English fluency is maintained and developed but Portuguese acquisition is often limited to lessons a few times per week — many children who attend international schools for several years leave Portugal with minimal functional Portuguese. At a bilingual school, children develop genuine bilingual competence — something that is difficult to build later and has well-documented cognitive and professional benefits.
If your child is under 8 and you intend to stay in Portugal for more than 2–3 years, the linguistic case for a bilingual school is very strong. If your child is older and already schooled in English, or if you are planning to return to an English-speaking country within 2 years, the international school path may create less disruption.
Curriculum continuity
If your family moves frequently, curriculum continuity matters. The IB framework is recognised in over 150 countries and provides a smooth transition between international schools worldwide. Cambridge qualifications (IGCSEs and A-Levels) are similarly portable, particularly within British and Commonwealth systems.
Portuguese national qualifications are less portable internationally but provide full access to Portuguese and European Union universities, which are increasingly sought after by families who want European higher education options.
Social integration
A bilingual school integrates your children into the fabric of Portuguese society — they make Portuguese friends, participate in local culture and genuinely belong to the community. An international school creates a warm, English-speaking bubble that can make transitions easier but may also limit the depth of local connection.
This is not a moral judgment — it is a practical consideration. Some families value immersion; others need the stability of a familiar educational environment during a difficult relocation period.
Cost
The cost difference is substantial. A family with two children at an international school in Lisbon might spend €30,000–€50,000 per year on school fees alone. The equivalent at a bilingual school would be €8,000–€20,000. Over a 5-year stay, this difference is significant.
Both are generally deductible under Portuguese IRS rules for resident taxpayers, but the out-of-pocket difference remains large.
Age matters: when to choose which
- Under 6: children at this age acquire language with remarkable speed and little effort. A bilingual school at this age is rarely disruptive and often produces near-native bilingualism within a year. This is the age at which the case for bilingual immersion is strongest.
- 6–10: still highly adaptable, but the social stakes of starting a new language increase. A bilingual school remains a strong option, but the transition support offered by the school matters more. Ask specifically about how they support children who arrive without Portuguese.
- 10+: academic content becomes more complex and language-dependent. Older children may struggle significantly in a bilingual school with limited Portuguese. For this age group, starting at an international school and transitioning later (or staying) is often the pragmatic choice.
- Secondary (12+): at this stage, curriculum continuity and university preparation become paramount. An international school following IB or Cambridge is usually the more straightforward path, unless the family is committed to a Portuguese educational pathway and the child has strong Portuguese already.
Questions to ask when comparing specific schools
- What percentage of subjects are taught in English? (For bilingual schools, the split should be clearly documented — ask for it in writing)
- How do they support children arriving without Portuguese / English? (Look for language support programmes, not just "they pick it up quickly")
- What are the university destination outcomes? (IB and Cambridge schools should be able to show where their graduates go)
- How international is the student body? (And does the level of international diversity match what your family needs for social integration?)
- What are the fees for the full school journey? (Some schools increase fees significantly in secondary — ask for the full fee schedule across all year groups)
The hybrid reality
Many expat families in Portugal use a hybrid approach over time: starting in a bilingual school to build Portuguese and integrate locally, then moving to an international secondary school for IB preparation and university access. This path combines the linguistic and social benefits of early bilingual immersion with the curricular advantages of an internationally recognised secondary qualification.
Use Skolvi to search by curriculum, language of instruction and city to find the specific schools that match your criteria — and book visits at your shortlisted schools before committing. The difference between schools that describe themselves similarly on paper can be enormous in practice.