This research has two major purposes: (1) to design a roadmap for the energy transition towards energy neutrality of the built environment for the city Delft, with technical interventions, based on local potentials, integrated at all scales of the city and (2) to develop a general approach that can be applied to other Dutch municipalities. The final result is based on both design-by-research (literature study) and research-by-design. The thesis exists out of three parts. The first part includes the literature study that forms the basis of the later designed approach and roadmap. This literature identifies the available energy sources and technologies that can be used to match the demands with the supplies and an analysis the existing methodologies. The approach for the energy transition of Dutch municipalities is defined in part II. This approach exists out of 8 steps; starting with the analysis of vision and targets. Followed by the status quo/the starting point. In the next step the local energy potentials are determined, resulting in a scenario for the energy transition of a certain city. Finally the roadmap is designed. In the last part of this thesis the approach is implemented to the roadmap towards energy neutral Delft.This results in an proposal for the energy systems and interventions. On basis of the results there is concluded that by working through all scales while defining the energy systems and interventions according to the local characteristics and energy potentials an integrated and realistic roadmap towards an energy neutral built environment in 2050 is designed for the city Delft; at the same time the designed approach can also help other municipalities to achieve their energy transition goals. This thesis hopes to make a contribution to the energy transition of Dutch municipalities in order to achieve their transition goals by making the design process of the roadmap more concrete with clear steps and tools and the case study for the city Delft.