This article evaluates the effectiveness of the Shelter.Ukraine Initiative, a civic response to the humanitarian crisis resulting from Russia’s full-scale invasion of Ukraine. The Initiative aims to address pressing needs through a local umbrella funding approach. Utilizing an evaluative framework that combines multiple approaches, including causal attribution techniques, contribution analysis, and regression analysis, we assess the effectiveness of the Shelter.Ukraine Initiative. We uncover influencing factors that contribute to the Initiative success. These include organizational ambidexterity, learning-by-doing, inter-organizational structure, and advanced technology for financial resource distribution. Our findings underscore the importance of reconfiguring the humanitarian aid architecture to enhance effectiveness. In addition, we suggest that the insights gained from our study can inform future evaluations of humanitarian aid initiatives. By incorporating similar evaluative frameworks and methodologies, researchers can assess the effectiveness of other initiatives and identify key factors contributing to success.