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.
If you have a big island that can accommodate many people, consider using full benches. The benches can be with or without backing to allow for more comfortable seating.
What can we expect to pay for an island during a remodel? This one is too hard to answer because there are simply too many choices. A "ready to install" stock island you can purchase in a home store with connections for drainage and power can run about $800. A custom concrete countertop island with sink, cooktop, and wine refrigerator can easily eclipse $10,000.
Even in smaller kitchens people are examining the possibilities that could arise by clearing away the traditional kitchen cabinets, and replacing them with kitchen islands that offer the same amount of walking space if not more. Here are some ideas for a kitchen island that is not plumbed in to serve a sink, but that offers a great deal of storage space and can effectively make your kitchen appear larger.
kitchen island lighting
kitchen island images
kitchen island with stools