The circular economy is essential for mitigating the significant environmental impact of buildings. Even though the services layers within building represent a golden spot for advancing circularity, the application of circular building services is minimal and hindered by various obstacles. These barriers, spanning technical, economic, legislative, and organisational domains, are often complex, interrelated, and context-specific. However, there is limited empirical prioritisation of these obstacles, particularly through methods that accommodates uncertainty and subjective expert judgment. Using insights from 155 multidisciplinary stakeholders, this study deploys a Fuzzy Synthetic Evaluation (FSE) to assess and rank the key obstacles to advancing circular building services. Findings reveal that technical fragmentation, unclear regulatory guidance, and lack of client demand are perceived as the most critical barriers. The differences in stakeholder perspectives emphasise the necessity of focused, actor-specific interventions. By using fuzzy logic to analyse stakeholder’s perspective on CE barrier, the study offers a more sophisticated understanding of the CE transition in building services. The research contributes to the body of knowledge by identifying critical obstacles for policymakers, industry leaders, and researchers to address in order to accelerate circularity in building services.