Multi-family buildings usually have a fixed subdivision in units with standard layouts. However, households are all different and change over time, as so do their needs and desires. With this in mind, the Open Building concept, which originated in the 1960s, proposed two levels of intervention and decision-making: the (collective) ‘support’ and (individual) ‘infill’. Although the Open Building approach has been embraced conceptually, with a new wave of interest in the Netherlands in r...