Greek household religion is known from scattered literary references, from the physical remains of domestic shrines and from later ritual handbooks. There is no surviving domestic liturgy, no book that a Greek householder followed, and nothing corresponding to the detailed civic calendars that document public festivals so much better.
What the evidence does establish is a structure. The hearth was a religious centre in its own right, and Hestia's claim on the first offering is attested. Guardian figures of the boundary, the courtyard and the storeroom were addressed under distinct titles, and the doorway and the street outside the house had their own protective presences, so that the household's religion was organised around thresholds as much as around the hearth. Walter Burkert's survey of Greek religion and Robert Parker's study of polytheism and society at Athens set out this material and its limits.
Modern reconstruction has to fill the gaps from the better documented public cult and from comparison, and the honest accounts within the movement say so. The atlas records the practice as it is described by practitioners and researchers, and records equally that the ancient household rite cannot be recovered in detail from the surviving evidence. Describing a living religion accurately here means describing its method, including the places where its method reaches the end of what can be known.