Worship is an essential aspect for every human being, but it is still rare to find a house with a particular prayer room. This study seeks to capture the various phenomena of worship in the dwelling, consisting of intrinsic and extrinsic motivation. In general, the choice of space for worship at home departs from intrinsic motivation from within. This research seeks to find extrinsic motivation, a characteristic of the environment that is then analyzed and compiled into design principles. This research was conducted using a qualitative grounded theory approach. Data was collected by distributing open questionnaires distributed freely (non-random sampling). The data obtained from 192 respondents were analyzed using content analysis, which was carried out in three stages, namely open coding, axial coding, and selective coding. The analysis results found that there were 7 (seven) designs for special prayer rooms in the house. These principles include comfort, privacy, tranquillity, minimal distraction, flexibility, cleanliness, and closeness. This study also revealed that the presence of a special room for worship could increase religious activities at home and increase interaction between family members in spiritual and religious aspects.