Space and Design are Important : You need around 3 feet of walking space around the island unit, and you must be sure that the drawers and doors in the cabinets have room to open. If you keep to the 36 inches then you should be OK. The only dimension that must be stated is that of the counter height. Ideally it should be the same as the rest of your kitchen units. If not, then it is not a disaster, but can be disconcerting when you are working on the various surfaces at varying heights.
Besides meal preparation, the kitchen can become a gathering area for family and friends if there is enough space. Since so much happens in the kitchen on a regular basis, getting the layout right is important. The kitchen island can serve as an additional eating area, and food preparation can easily be done there. In a large kitchen, the kitchen island can shorten the distances within the working triangle (sink, refrigerator and range or cooktop) and make it more efficient.
Consider the Services ; If you need a power supply for appliances, you can run it up through a pipe or conduit up to the ceiling, or even better, run a line below the floorboards up into the kitchen island. Make sure your installation conforms to local and national regulations. You are advised to employ a qualified electrician to do this.
You may only have a limited space and you think that seating will only make your kitchen look crowded. However, it does not mean that you can't have seating. For a room with limited space, you can use smaller stools. To save space, you can also choose chairs that you can store in a closet when you do not need them.
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