The COVID-19 pandemic, as a suddenly occurring and global exceptional situation, led to comprehensive restrictions on everyday life and posed a significant challenge to the world's population. Personal living circumstances had to adapt to the new conditions, familiar freedoms of movement were severely limited, leading to the fact that most people henceforth had to conduct all their daily activities at home out of necessity. As a result, problematic living situations also came more into focus, as the COVID-19 pandemic brought not only health, economic, and political challenges. The importance and central role of the home became even more evident during the COVID-19 lockdown, as it represents more than just a physical living space and has significant impacts on the social and psychological well-being of its residents. However, the relationships between objective spatial density, subjective density stress (crowding), psychological privacy, and aggression of the residents remain empirically and theoretically unclear, which this study intends to investigate using the example of the first COVID-19 lockdown in the United Kingdom. The data basis was a questionnaire survey designed as a quantitative cross-sectional study (N = 301). Preliminary statistical calculations show a clear correlation between objective spatial density and aggression of the residents, partially because the desired level of psychological privacy could not be achieved. These effects are constant regardless of age and access to outdoor spaces (balcony or garden). Further calculations are currently being carried out.