Many governments in semi-democratic regimes have adopted participatory democratic institutions to promote development and accountability. But limited resources, weak civil society, and a history of authoritarian politics make building subnational democratic institutions daunting. Do participatory institutions expand accountability in these environments? We address this question by evaluating citizen decision-making in Kenya’s local participatory processes. We first administered a survey experiment surrounding citizens’ development policy preferences to 9,928 respondents in four Kenyan counties. We then nest this survey experiment in participant observation and over 80 elite interviews. Our conclusions are mixed: respondents readily change their policy preferences to align with the government’s policy actions, which suggests limited prospects for accountability. However, respondents use participatory budgeting venues to question government officials about missing projects, which provides a potential foundation for accountability. Yet, uncompetitive local elections, the absence of independent civil society’s participation, and new program rules are likely to limit democratic accountability.