SAIS is a British international school in Monte Estoril, close to the Cascais coast. Its full name is Santo António International School, and it takes children from age 2 right through to 19.
The school follows a Cambridge pathway, from Primary to Cambridge IGCSE, and then A Levels or the Cambridge AICE Diploma. One teacher quoted on the school’s site calls it “like a second home”, and parents there talk about children feeling known.
Its published tuition is lower than at many international schools nearby, but do add the yearly admission fee and other charges when you compare. A visit will show you whether it suits your child.