Until now, research on projector-camera systems had only concentrated on user-interaction within a lab-environment. As a result of this, there are very limited insights into how such systems could be used in everyday life. It was therefore our aim to investigate requirements and use cases of home deployed projector-camera systems. To this purpose, we conducted an in-situ user study involving 22 diverse households. Several different categories were specified using a grounded theory approach; placement, projection surface, interaction modality and content/use cases. Based on the analysis of our results, we created UbiBeam; a projector-camera system designed for domestic use. The system has several different features including automatic focus adjustment with depth sensing which enables ordinary surfaces to be transformed into touch-sensitive information displays. We developed UbiBeam as an open source platform and provide construction plans, 3D-models and source code to the community. We encourage researchers to use it as a research platform and conduct more field studies on projector-camera systems.