The article presents the specificity of cities due to segregation processes, which form a part of the urbanisation structure of a city. These processes are also reflected in the access to basic public services: education, health care, housing, technical communal infrastructure, recreation and security, and this has a fundamental and direct impact on the quality of people’s lives. The article shows how, in the social space of the city of Gdynia, it is possible to eliminate the effects of segregation, and what is the significance of revitalisation activities which minimise these effects, but do not, in fact, change this division (social, spatial, cultural). The selected revitalisation projects in Gdynia concern the revitalisation project of the so-called ‘Pekin’, the second, the revitalisation of the districts Grabówek and Chylonia, and the project ‘Utrecht’, aimed at homeless people, mostly from ‘Pekin’, Chylonia, Grabówek, or currently living in these districts. The revitalisation of ‘Pekin’ is mainly an activity of activating residents in the professional sphere, helping with finding alternative accommodation and financial support with apartment rentals. The entire estate will eventually be demolished. The revitalisation of Chylonia and Grabówek are animation, socio-therapeutic activities, streetworking, pedagogical and psychological counselling, training, volunteering (including international volunteering), organising the local community.