The minimum space required for a walk-in wardrobe is about 4 feet by 4 feet. This size allows for hanging space on one wall and potentially some shelving or drawers on the opposite wall. However, for a more functional and comfortable walk-in wardrobe where you can have storage on multiple walls and perhaps a small dressing area, a room measuring at least 6 feet by 8 feet is recommended. Keep in mind that the size can vary based on individual needs and the available space in your home.