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The cost to install a kitchen island ranges from $900 to $6,500, with an average price of around $4,800. The final cost depends on whether you buy a prefabricated unit or have one custom-built. Prefabricated kitchen islands are generally cheaper. A simple prefabricated cart can cost between $150 and $900, while a permanent, stationary prefabricated island costs from $900 to $5,000. A custom-built kitchen island averages around $4,800 but can cost $10,000 or more depending on factors like materials, size, design complexity, and accessibility.

It is generally more cost-effective to purchase stock or semi-custom cabinets than to have them custom-built. The best option depends on your budget and customization needs.

Here is a breakdown of the average costs per linear foot:

• Custom Cabinets: $500 to $1,200. The final price is influenced by factors like materials, size, and design complexity. For example, a basic slab cabinet door might cost $60 to $70 for materials, while a more intricate mullioned glass inset panel door can range from $100 to $200 per door.

• Semi-Custom Cabinets: $150 to $700.

• Stock Cabinets: $100 to $400. These are pre-built and the most affordable option, but they offer limited customization and may not be suitable for rooms with unusual shapes or high ceilings.

The cost to install a kitchen island can range from $900 to $6,500, with an average price of around $4,800 for most homeowners. The final cost depends on whether you choose a prefabricated or custom-built option. It is generally cheaper to buy a prefabricated island than to build one from scratch. A budget-friendly prefabricated cart can cost between $150 and $900, while a permanent prefabricated stationary island costs from $900 to $5,000. Custom-built kitchen islands average $4,800 but can cost $10,000 or more, depending on factors like materials, size, design complexity, and accessibility.

While most kitchen island installations do not require a permit, some situations do. Any major kitchen renovation will require one, and depending on your municipality, you might also need one if you install new plumbing or electrical work. 

Your kitchen island installation pro will be able to determine if you need a permit for your job, which can run you between $460 and $2,900, depending on the permits required.