Prefabricated cabinets: $100-$300 per linear foot. Material types like solid wood versus MDF also affect cost. Kitchen islands often integrate sinks, cooktops, dishwashers . This guide explains typical price ranges for common island options, identifies which choices drive costs, and offers practical budgeting tips for American kitchens. By understanding materials, layout, installation requirements, and labor, homeowners can plan an island that fits both needs and. Given that size is the biggest indicator of price, you can understand that a 10 sq. island will cost significantly less than a 20 sq. However, the average cost of a kitchen island usually ranges from $3000 to $5000. If you're ready to go for the relatively less expensive models, your budget can run as little as $100. Katie Newcomb is an interior designer and co-owner of Kith & Kin Interior Design.