How big should it be?

An island should have enough space to carry out kitchen activities, look proportional within the kitchen, and have wide paths around its perimeter. For smaller kitchens, a work table or cart with wheels may be better than a built-in.
When designing your island, consider function first and then create one that fits the size of your kitchen and your budget and has a design you like.
A work island: The furniture, inspired by antique work tables, usually has open drawers and shelves. Its transparent design takes up less visual space but makes it easier to hide things.
A storage island: A bare freestanding or built-in island that provides counter and cabinet space without the expense of sinks or large appliances. Open shelves can store cookbooks and other display items.
An island for preparing and washing: Sinks are ideal for washing hands, washing food, and serving as a party bar. Could you place the bar in the corners to maximize counter space?
A dining island: A protruding counter for casual dining needs knee room, room for diners to move chairs back, and seating space: at least 24 inches wide for each chair.
A kitchen island: A stove on an island turns the chef toward the center of the room to watch the action. But unlike a kitchen next to a wall, a kitchen island leaves hot pots more exposed and will cost more to vent.
Space for a kitchen island is an ideal addition to your kitchen remodel. Having the budget to make it big, functional, and beautiful is another excellent idea. The best solution to get the perfect island for you and your kitchen is to hire a designer. They have all the right tools and knowledge to create your dream.