In this study, the participation of employee architects in decision-making in architectural firms is investigated. This is with a view to identifying the organisational contexts that enhance employee participation in decision making. The impact of such participation on the performances of the firms was also assessed. This study was carried out through a questionnaire survey of employers of architects in Nigeria. In agreement with findings of previous studies, participation of the employees of the architectural firms in the study in decision making is low. Employee participation in decision making in the firms was dependent on the staffing strategy and proportion of junior staff in many cases. The positive impact of employee participation in decision making on firm performance varied with the nature of the decision. This study concludes that there is need for employers in architectural firms to identify the categories of decision that employees should be involved in and to modify their firm contexts to encourage participation where desired.