The document presents the Urban Circularity Assessment (UCA) method. It is an urban material flow and stock accounting method paired with system-wide indicators to assess the material circularity of a city. The material flows are accounted economy-wide for two years, applying the Mayer et al. (2019) framework, which in itself builds on the EW-MFA method, including the wide material scope, while optimised for a circular economy assessment. The material stock accounting is limited to buildings of a municipality, with the material scope depending on data availability. Finally, the mass-based, “circularity” Indicators cover the entire system and enable the assessment of a city’s circularity. The developed UCA method seeks to find a balance between scientific rigour and comprehensiveness on the one hand, and operability by urban policy makers and practitioners on the other.