Linguistic diversity at Czech schools has increased in the last decade, and it has become a new everyday reality. Nevertheless, there is still a lack of studies investigating lived experiences with managing multilingualism at schools. Our study examines schools as multilingual social spaces in which the visible language choice on signs reveals the language regime based on ideologies and policies. We contextualize our study according to top-down language policy, and the essential theoretical concepts such as social space or language regime are explained. The linguistic landscapes at schools (so-called schoolscapes) are analysed and interpreted to capture schools as multilingual social spaces. The focus lies on: (1) displayed languages; (2) authorship of the object: (3) location of the object. The data from schoolscaping are complemented by interviews with school principals, who are responsible for language choice decisions. The investigation took place in four schools, where multilingualism plays an essential role. The results indicate that despite the multilingual reality and the promotion of multilingualism by anchoring it in the agenda of inclusive education, language homogenization is operative in schools. Our results are relevant for exploring the linguistic environments and language regimes at schools and reveal possible explanations for linguistic homogenization.