Sustainable urban mobility is an established target of policy making and planning in Europe. It is associated with, among others, better air quality, less noise disturbance, increased safety and quality of public space. In this regard, one of the EU Commission’s main tools to achieve sustainable urban mobility, through Sustainable Urban Mobility Plans (SUMP), require the explicit integration of Monitoring and Evaluation (M&E). Yet, European cities face common barriers when it comes to materialising M&E in practice. To avoid or overcome these barriers, this paper argues for integrating Capacity Building (CB). We draw this conclusion based on experiences made during the M&E and CB of the Horizon 2020 Project ‘Metamorphosis’. We report our experiences, rating different monitoring indicators used for the evaluation of measures transforming car-oriented neighbourhoods into children-friendly neighbourhoods in seven European cities. We then give advice on how to design and integrate CB for a feasible M&E scheme.