The most consistently valuable aging-in-place features are the structural ones that have to be built during construction: zero-threshold showers and entries, doorways at least 36 inches wide, grab-bar backing built into bathroom walls, single-floor living for essential rooms, reinforced flooring under bedroom and bathroom areas, lever hardware on all doors and faucets, and considered lighting at low glare levels. The features that get added later (grab bars, transfer poles, raised toilet seats, medical equipment) install easily into a properly built space. Kingdom & Co. builds these structural considerations into every aging-parent casita project as standard, not as upgrade options.