Five design considerations consistently determine whether a multigenerational arrangement succeeds or fails. First, separate entrances so each resident can come and go without going through someone else’s space. Second, sound isolation so daily routines do not collide. Third, accessibility features for older residents (zero-threshold showers, lever hardware, wider doorways, grab-bar backing in bathroom walls). Fourth, a shared outdoor space (courtyard, patio, or breezeway) that lets the family connect on purpose rather than by accident. Fifth, design that respects the resident’s autonomy: a separate kitchen even if it is small, the resident’s own thermostat, their own front door key, their own mail. Kingdom & Co. designs around these considerations on every multigenerational casita project.