The in-between space in housing is usually reduced to its function of circulation, despite the fact, that this space is the physical space between people, the space where people meet. Right there neighborship develops. Multiple surveys give evidence of the benefit of good relationships to the neighbors for the individual and the group. Moreover, functioning neighborship has a positive effect on the social capital of a city or a neighborhood. Therefore, politics actively promote developments to strengthen neighborship. (e.g. in Vienna through Soziale Nachhaltigkeit in housing-development competition, Gebietsbetreuung, street festivals, Fragnebenan, ...). The in-between space was and still is an important topic for planners ¿ especially in housing. Since the late 19th century various concepts working with this space were created to prevent anonymity in the big cities and encourage solidarity in society. The first part of the thesis shows the diversity of in-between spaces in housing and the different opportunities of planning supporting environment for residents. Most people can¿t enjoy those sophisticated building discussed in the first chapter though. What does the in-between space look like in common housing? What is the in-between space most of us are confronted with? And how does it function? In the second part, three different in-between spaces which are in a way representative for Viennese housing based on spatial analysis, are evaluated. A typical Viennese Gründerzeit house, social housing of the Red Vienna period and row housing of the fifties serve as exemplary because of their high occurrence in the city. Complementary to the spatial analyses, technical and constructional modifications, that changed the in-between space over the years of its existence, are explored. Through narratives and interviews, the interpersonal level and the original social function of the in-between space is reconstructed. Based on surveys, experiences and questionnaires the comparison to today¿s function is drawn. What are the potentials of in-between spaces in housing? How can we activate them for neighborhoods? The three analyses are completed with explorations of the potentials and exemplary concepts for activation. Certain concepts are installed 1:1 in the analyzed Gründerzeit house and the effect on the residents is reviewed.