I should add that if you had asked about a project to track people in your own home, I would’ve gone a completely different route with this, microlocation probably based on one of the “wasp in a box“ models.
However, since you said this was an art project, I have made the perhaps incorrect assumption that you don’t own the space where the project will be presented and that it will be set up on a temporary basis. Also, I envisioned a kind of large gallery space rather than something with typical residential rooms and doors. And I assumed that you can’t count on each individual visitor having downloaded a particular app to a smart phone. That’s why I mostly just considered sensors that could be set up at the start of the day and easily taken down again.
If I’m wrong on all that, then definitely look at the various project reports on microlocation. You can find those by going to the quick browse lists in the community – created wiki, looking down near the end of the page for the project report section, and choosing the list on presence and micro location.