This project tries to aggregate the urban planning and the environmental field in the process of design and planning of urban development sector. It will study how the criteria of sustainability has been introduced in the neighbourhoods in order to achieve greater living quality and to be more efficient in the utilization of resources. It will analyse the creation of some Ecodistricts that have been projected in many European cities along the years and it will serve us as an example of how we have integrated the social, constructive and environmental sustainability criteria. This project will be centered in using the mentioned criteria, in order to incorporate them in the creation of a suburb in a township of Vallés Occidental, specifically in Palau-solità i Plegamans which is in the initial approval phase of the writing of the Pla d’Ordenació Urbanística Municipal. This project will allow us to choose an urban development sector in phase of initial approval to bring the maximum of environmental aspects that lead towards the conception of the Ecodistrict.