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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.

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.

If your walls aren’t plumb, it can make installing frameless cabinets difficult because they require precise measurements so they don’t show imperfections. Any dissymmetry with installation can cause the doors and drawers to not function correctly. Frameless cabinets are also thicker and heavier, making them harder to install by yourself.

Using a shim or another type of self-leveling feet on the bottom edge of your cabinet bases will help to level them out if you’re installing them on a less-than-level surface. To make this process easier, you can add your shims before attaching the bases to your cabinets while they’re still light and easy to move around.