This paper investigates language policy formation through participatory and deliberative methods and, more concretely, the regulation of gender-neutral language in Barcelona City Council (Spain). Through an argumentative approach to policy, the paper examines a specific language policy idea, process and solution, and the accompanying discursive argumentation used by decision-makers. The paper (a) shows that linguistic preconceptions and power relations may constitute a potential barrier to effective deliberation on language, and (b) argues that if local modes of governance (as opposed to the centralised role assigned to language academies) are going to be used to prescribe language practices in institutional contexts, arrangements should be put in place to provide access to a full range of views about language, generate reflective judgments and promote a public exchange of arguments. The paper concludes with a discussion about the implications of this study for the inclusion of deliberation in language policy-making.