Since 1974, two out of every five constitutions (40.3%) were prepared via processes that included public consultation. The reasons for adopting these participatory mechanisms, however, are largely unexplored. I argue that public consultation is a tool for elite contestation of power. Introducing an original dataset of public consultations in constitution-making processes from 1974–2021 (n = 300), I find that in democracies, factional majorities and newcomer elites use public consultation to legitimate a break from the status quo. In autocracies, governing coalitions that depend on performance and enjoy greater party institutionalization push for public consultation to preserve favorable power-sharing arrangements.