In this article, I examine building-user interactions on three dementia wards in the Netherlands. I coin the concept of "sociomaterial awareness" to articulate a collective situational sensitivity to the ways in which the built environment invites its users (professionals, but also people with dementia themselves) to act in specific ways, as well as to possibilities to adjust (elements of) the building. I argue that along with different enactments of dementia, different positions become available for residents when the built environment is acknowledged as actively shaping care interactions.