All receptacles servicing countertop areas require GFCI (ground-fault circuit interrupter) protection. A kitchen must have at least one wall-switch controlled light, with the switch placed at the entrance. At least 8 percent of the total square footage of the kitchen must be windows or skylights. It's also important to have task lighting over every work surface. For all cooking surface appliances, install an outdoor-venting kitchen ventilation system with an exhaust rate of 150 cubic feet of air per minute. Install range hoods or microwave-hood combos at least 24 inches above a stove or according to manufacturer instructions. If a microwave is placed below the countertop, the bottom must be at least 15 inches off the floor. Allow 15 inches of clear space above the refrigerator.