At least 18 square feet of general storage is recommended, with 6 square feet added to that total for each additional family member.
Incorporate at least 12 inches of work surface on one side of your refrigerator or stovetop for adequate prep space. The legs of an efficient triangle (the space between the refrigerator, sink and range) should total no more than 26 feet, with no leg equaling less than 4 feet.
Countertops should be at least 24 inches deep.
To make appliances universally usable, create a 30-by-48-inch clearance space in front of each of them.